ICS43.040.40  
Qxx  
GB 
 
National Standards of the People’s Republic of China  
 
GB 5763  – XXXX  
Replaces  GB 5763 - 1998   
 
 
 
 
 
Brake Linings for Automobiles  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Issuing Date: 200X – XX -XX             Implementation Date: 200X –XX -XX 
 
 
Issued  by the General Administration of Quality Supervision, Inspection and 
Quarantine of the People’s Republic of China  and  the Standard isation 
Administration of the People’s Republic of China    GB 5763 -xxxx    
 
Preface  
 
The entire content s of this standard are mandatory.  
 
This standard has non -equivalently adopted JIS D44ll -1993 (2006 Verification ) of 
Japan and the  Friction Technical Requirement and Friction Test Method is the same 
as in JIS D44ll -1993 (2006 Verification ). 
 
The main modifications to this standard  in comparison  with GB 5763 -1998  are as 
follows:  
 
- Terms, definitions and symbols  have been  added;  
- Requirements and corresponding test methods  for braking performance, shear 
strength, impact strength, swell  and compression  ratio have been  added ; 
- Testing rules  have been r e-compiled , adding  test content and test items;  
- Appendix B " Disk temperature test device and test position" has been  
amended  from  an information appendix to a normative appendix;  
- A normative appendix - Appendix C " Mutual relations of pendulum, test 
sample and support”  has been added.  
 
Appendices B and C to  this standard are  normative appendix es and  Appendix A is an  
information  appendix . 
 
This standard is proposed by the China Federation of Building Materials .  
  
This standard is under the jurisdiction of National Non-metallic Mineral s and  
Products Standardi sation Technical Committee . 
 
Organi sation in charge  of drafting this standard :  
 
Organi sation s that  parcitipat ed in the drafting  of this standard :  
 
The main drafter s of this standard:  
 
This standard was f irst issued in 1986 ; the first revision was  made  in 1998 ; this  
version  is the second revision  of this standard . 
   GB 5763 -xxxx    
 
Brake Linings for Automobiles  
 
1 Scope  
 
This standard specifies the classification, technical requirements , test methods, 
inspection rules, mar ks, packag ing, transportation  and storage etc. for brake linings  of 
automobiles .  
 
This standard  applies to  brake linings  for automobiles  (hereafter referred to as  linings ). 
 
2 Normative References  
 
The provisions of the following documents become provisions  of this Standard after 
being referenced. For dated reference documents, all later amendments (excluding 
corrigenda) and versions do not apply to this Part; however, the parties to the 
agreement are encouraged to study whether the latest versions of these documents are 
applicable. For undated reference documents, the latest versions apply to this 
Standard.  
 
GB / T 2828  Sampling procedures and tables for lot by lot inspection by 
attributes  (Apply to inspection of successive lots or batches  
GB / T 9439  Gray iron castings  
GB / T xxxx  Road vehicles - Brake linings - Shear strength test method of disk 
brake pad  and drum brake shoe assembly  
GB / T xxxx  Road vehicles - Brake linings - Swell test method of disk brake 
pads 
GB / T xxxx  Road vehicles - Brake linings - Compressi bility  test method  
JB / T 7498  Sand paper  
QC / T 479 -1997  Goods vehicles, buses brake bench test methods  
QC / T 564 -1999  Car brake bench test method s 
 
3 Terms, Definitions  and Symbols  
 
The following terms, definitions and symbols apply to th is standard.  
 
3.1 Terms and Definitions  
 
3.1.1 Coefficient of friction ( () 
 
The ratio of the friction force (N) and the normal force (F) applied to the test 
plate  
 
3.1.2 Coefficient pointed () 
 
The friction coefficient agreed by the supply and demand sides according to a 
specific vehicle model  
   GB 5763 -xxxx    
3.1.3 Wear (V)  
 
The rate of the lining w earing volume and the torque under the specified 
condition  
 
3.1.4 Shear strength  
 
The ratio of the force parallel to the back plate of the disk braking pads or the 
edge of the drum brake shoes, which completely shears off the lining materials 
from the back plate  or shoes to the shear ing geometry area  
 
3.1.5 Swell  
 
The difference between  the l ining thickness increase under  heat and the initial 
lining thickness  
 
3.1.6 Impact strength  
 
The ratio of the impact energy consumed to break the test sample and the cross 
section at whi ch the sample breaks  
 
3.1.7 Compressibility  
 
The ratio of the lining thickness decrease  volume  (tested in the direction of the 
force  and the surface of friction)  and the initial lining thickness  
 
3.2 Symbol  
 
Ga -  total vehicle mass , kg;  
V -  initial braking speed,  km/h ; 
Vmax -  rated maximum speed, km/h ;  
P -  brake pipe pressure, MPa ;  
Pmax -  maximum  brake pipe pressure, MPa ;  
MB -  braking torque, N•m ;  
Me -  rated braking torque, N•m ;  
j -  braking deceleration , m/s2.  
K -  stability coefficient of braking torq ue i.e. the  ratio of the minimum 
braking torque and the maximum braking torque in the same test;    
Kfront -  stability coefficient of front -wheel brake torque ;  
Kback -  stability coefficient of rear brake torque ;  
Vat (m -n) - speed stability  - under the r ated pipe pressure  the ratio of the 
difference between the braking torque at the initial braking speed of m 
km/h and the braking torque at the initial braking speed of n km/h to 
the braking torque at the initial braking speed m km/h,  %.  
 
4 Classification  
 
The linings are classified into 4 categories according to their applications (see 
Table 1).  
   GB 5763 -xxxx    
 
Table 1 – Lining Category  
Category  Application  Category  Application  
Category 1  Vehicle parking 
brake  Category 3  Medium and heavy 
vehicle drum brake  
Category 2  Micro and light 
vehicle drum brake  Category 4  Disk brake  
 
5 Technical requirement s 
 
5.1 Appearance quality  
 
Lining s should not be cracked, blistered, nor have rugged  surface s or warping  
which may  affect their application.  
 
5.2 Dimension deviation  
 
The customer defin es the basic dimensions of the linings;  the dimension 
tolerances of width and thickness should conform to the requirements  set out 
in Table 2.  
 
Table 2 - Dimension Deviation  
Linings  Basic dimension, mm  Tolerance, mm  
30  ±0.30  
3060  ±0.50  
60100  ±0.70  Width  
100  ±1.00  
6.5  ±0.15  
6.510  ±0.20  Category 1  
Category 2  
Category 3  
Thickness  
10  ±0.25  
10  ±0.30  
1020  ±0.40  
2030  ±0.50  Category 4  Thickness  
30  ±0.60  
Note: In  the case of special requirement s these tolerances may be ignored.  
 
5.3 Friction performance  
 
5.3.1 The lining friction coefficient , its tolerance and wear should conform to the 
requirements set out  in Table s 3 to 6.  
 
5.3.2 After the test , no cracks, bulging etc.  affecting the application should be 
emitted from the sample plate; the test plate should not leave any obvious 
scratches on the disk friction surface.  
 
Table 3 – Category 1 Friction Performance  
Test temperature1) Item 
100 oC 150 oC 200 oC    GB 5763 -xxxx    
Friction coefficient2) () 0.300.70  0.250.70  0.200.70  
Friction coefficient 
appointed tolerance (  ) ±0.10  ±0.12  ±0.12  
Wear (V),  
107cm3/(N·m)   1.00  2.00  3.00  
1) The test temperature refers to the temperature on the disk friction surface of the test machine.  
2) The fr iction coefficient range covers the tolerance.  
 
Table 4 – Category 2 Friction Performance  
Test temperature1) Item 
100 oC  150 oC  200 oC 250 oC  
Friction coefficient2) () 0.250.65 0.250.70 0.200.70  0.150.70 
Friction coefficient 
appointed tolera nce (  ) ±0.08  ±0.10  ±0.12  ±0.12  
Wear (V),  
107cm3/(N·m)   0.50  0.70  1.00  2.00  
1) The test temperature refers to the temperature on the disk friction surface of the test equipment.  
2) The friction coefficient range covers the tolerance.  
 
Tabl e 5 – Category 3 Friction Performance  
Test temperature1) Item 
100 oC 150 oC 200 oC 250 oC 300 oC 
Friction coefficient2) () 0.250.65 0.250.70 0.250.70 0.200.70 0.150.70 
Friction coefficient 
appointed tolerance (  ) ±0.08  ±0.10  ±0.12  ±0.12  ±0.14  
Wear (V),  
107cm3/(N•·m)   0.50 0.70 1.00 1.50 3.00 
1) The test temperature refers to the temperature on the disk friction surface of the test equipment.  
2) The friction coefficient range covers the tolerance.  
 
Table 6 – Category 4 Friction Performance  
Test temperature1) Item 100 oC 150 oC 200 oC 250 oC  300 oC  350 oC 
Friction coefficient2) () 0.250.65  0.250.70 0.250.70 0.250.70 0.250.70  0.200.70 
Friction coefficient 
appointed tolerance (  ) ±0.08  ±0.10  ±0.12  ±0.12  ±0.14  ±0.14  
Wear (V),  
107cm3/(N·•m)   0.50  0.70  1.00  1.50  2.50  3.50  
1) The test temperature refers to the temperature on the disk friction surface of the test machine.  
2) The friction coefficient range covers the tolerance.  
 
5.4 Braking performance  
 
5.4.1 Category 2 and Category 4 linings used in cars should conform to the braking 
performance  requirements set out  in Table 7.  
 
Table 7 – Braking Performance of Brake Linings for Cars  
Serial 
Number  Test Item  Performance Requirement  
j    6.1m/s2 V = 50km/h,  P = Pmax 
K    0.75  
j    5.8m/s2 1 First time efficiency 
(before running -in) 
V = 80km/h,  P = Pmax 
K    0.65    GB 5763 -xxxx    
j    5.2m/s2 V = 100km/h,  P = Pmax 
K    0.55  
j    7.8m/s2 
Kfront    0.75  V = 50km/h,  P = Pmax 
Kback    0.7 5  
j    7.3m/s2 
Kfront    0.65  V = 80km/h,  P = Pmax 
Kback    0.55  
j    6.8m/s2 
Kfront    0.65  V = 100km/h,  P = Pmax 
Kback    0.55  
j    6.1m/s2 
Kfront    0.60  V = 130km/h,  P = Pmax 
Kback    0.45  
V = 80km/h j    7.1m/s2 
V = 100km/h j    6.4m/s2 2 Second time efficiency 
(after running -in) 
at 50km/h u nder pipe pressure of 
7.8m/s2  
V = 130km/h j    5.5m/s2 
Braking at V = 100km/h and pipe pressure to decelerate the vehicle to 
4.5m/s2 , the braking cycle = 35s, the  fourth braking torque fading rate 
(ratio of the difference between the first braking torque and the fourth 
braking torque to the first braking torque) is not higher than 40%.  
The first braking deceleration of the recovery test is not lower than 
1.5m/s2 3 First heat fade and 
recovery  
The difference between the twelfth braking deceleration (braking torque) 
and the reference deceleration (braking torque) in the recovery test is not 
higher than 23%.  
At V = 100km/h the eighth braking torque fading rate is not higher than 
40%.  
The first braking deceleration of the recovery test is not lower than 
1.5m/s2. 4 Second heat fade and 
recovery  The difference between the twelfth braking deceleration (braking torque) 
and the reference deceleration (braking torque) in the recovery test is no t 
higher than 23%.  
j    7.8m/s2 
Kfront    0.75  V = 50km/h,  P = Pmax 
Kback    0.75  
j    7.3m/s2 
Kfront    0.70  V = 80km/h,  P = Pmax 
Kback    0.65  
j    6.8m/s2 
Kfront    0.65  V = 100km/h,  P = Pmax 
Kback    0.55  
j    6.1m/s2 
Kfront    0.60  5 Third time efficiency  
V = 130km/h,  P = Pmax 
Kback    0.45  
6 Appearance check after 
test There should no scratches on the brake drum (disk) working surface; the 
linings are intact and without any obvious cracks.  
 
5.4.2 Category 3 and Category 4 linings used in goods vehicles and bu ses should 
conform to the braking performance  requirements set out  in Table 8.  
   GB 5763 -xxxx    
 
 
 
Table 8 – Braking Performance of Brake Linings for Goods Vehicles and Buses  
Serial 
Number  Test Item  Performance Requirement  
1 First running -in test  At 1800kg    Ga    600 0kg and with 80% 
contact area the running -in is 200;  
At Ga6000kg  and with 80% contact area the 
running -in is 500.  
V = 30km/h, P = Pmax Me    Mb    1.3Me 
V = 50km/h, P = Pmax   2 First efficiency test  
V = 80%Vmax, P = 
Pmax   
 Vst(50-30)     10%  
3 Speed stability   Vst(70 -30)     20%  
At 1800kg  Ga  6000kg  the absolute fading rate 
(ratio of the difference between the first braking 
torque and the tenth  braking torque to the first 
braking torque) is not higher tha n 40% ; 
At Ga  6000kg  the absolute fading rate is not 
higher than  25%. 4 First fading recovery test  
The absolute recovery rate ( ratio of the difference 
between the last braking torque and the reference  
braking torque to the reference  braking torque)  is 
not higher than 20%. 
V30km/h, P = Pmax Me  Mb  1.3Me 
V50km/h, P = Pmax   5 Secon d efficiency test  
V80%Vmax, P = Pmax   
 Vst(50 -30)   10%  
6 Speed stability   Vst(70 -30)   20%  
7 Second fading recovery test  The absolute fading rate  (ratio of the difference 
between the  maximum  braking torque and the 
minimum  braking torque to the maximum  braking 
torque  of the pipe unit pressure ) is not higher than 
60%. 
V30km/h, P = Pmax Me  Mb  1.3Me 
V50km/h, P = Pmax   8 Third efficiency test  
V80%, P = Pmax   
 Vst(50 -30)   10%  
9 Speed stabil ity  Vst(70 -30)   20%  
10 Appearance check after test  There should no scratches on the brake drum 
(disk) working surface; the linings are intact and 
without any obvious cracks.  
 
5.5 Shear strength  
 
5.5.1 The shear strength of Category 2 (bo nding type) lining should not lower than 
1.5MPa.  
 
5.5.2 The shear strength of Category 4 (bonding type) lining should not lower than 
2.5MPa.  
   GB 5763 -xxxx    
5.6 Impact strength  
 
5.6.1 The impact strength of Category 3 lining should not lower than 0.3 J/cm2. 
 
5.7 Swell  
 
5.7.1 The swell of Category  4 lining at than 200 oC should not be higher than 2.5%.  
 
5.8 Compressibility  
 
5.8.1 The compressibility of Category 4 lining at room temperature should not 
higher than 2% and at 4 00 oC should not  be higher than 4%.  
 
5.8.2 The compressibility of Category 2 and Category 3 lining at room temperature 
should not higher than 2% and at 2 00 oC should not higher than 4%.  
 
6 Test method  
 
6.1 Appearance quality check  
 
Appearance quality is checked through  visual  observation s and knocking 
sound.  
 
6.2 Dimension measurement  
 
Width and thickness  are measured by vernier calliper with  an accuracy of 
0.02mm.  
 
6.3 Friction performance test  
 
6.3.1 Test plate  
 
6.3.1.1  Make two test plates from the same lining.  
 
6.3.1.2  The friction surface size of the test plate should be  25mm x 25mm with 
tolerance of -0.2mm to 0mm.  
 
6.3.1.3  The thickn ess of the test plate should be 5mm to 7mm and the thickness 
difference between the two test plates should be lower than 0.2mm. If the 
thickness of the lining product is less than 5mm, the original thickness should 
be adopted.  
 
6.3.2 Test equipment  
 
A friction t est machine with  a fixed speed should be used. See Appendix A.  
 
6.3.2.1  The distance between the centre of the test plate and the centre of rotating 
shaft should be  0.1mm.  
 
6.3.2.2  The disk material is trademark HT250 grey cast iron of GB/T 9439 with   GB 5763 -xxxx    
hardness grade H195 (180HB ~ 220HB);  the disk metallograph y is pearlite. 
The surface should be processed with sand paper of medium granularity of 
P240 of JB/T 7498.  
 
6.3.2.3  Friction is measured using  an automatic recorder.  
 
6.3.2.4  The disk friction surface temperature ( hereinafter abbreviat ed to ‘disk 
temperature ’) should be  tested by applying a silver plate welded with a 
thermocouple to the disk friction surface with a force of 0.1N to 0.2N; the test 
position should be the centre line of the width of the disk friction area and at 
50mm to 10 0mm along the rotating direction from the test plate centre. See 
Appendix B.  
 
6.3.2.5  The heating and cooling device s should be  located inside the disk; the disk 
temperature can be adjusted from 100oC to 350 oC. 
 
6.3.3 Test condition  
 
6.3.3.1  The test temperature tolerance  should be  ± 10 oC 
  
6.3.3.2  The disk constant speed should be  set from  480 r/min to 500r/min.  
 
6.3.3.3  The test plate pressure should be 0.98MPa . 
 
6.3.3.4  The friction direction should be  the same as the  friction direction of the lining.  
 
6.3.4 Test procedure  
 
Fix the two test plates to t he plate support  arm and carry out the test according 
to the following sequence:  
  
6.3.4.1  Run in the test plates until the contact area reaches above 95% at 100 oC. After 
the test plates have cooled to room temperature , measure the thickness of the 
test plates wi th a calliper with  an accuracy of 0.01mm. Make 5 test points for 
each plate and take the average arithmetic  value.  
  
6.3.4.2  At the test temperature of 100 oC, measure the friction of 5 ,000 disk rotations 
according to 6.3.3; or divide 5000 disk rotations into equa l 10 to 20 sections 
and measure the friction of 250 to 500 rotations. Measure the thickness after 
the friction test according to 6.3.4.1.  
 
6.3.4.3  At the test temperatures of 150 oC, 200 oC, 250 oC, 300 oC and 350 oC carry out 
the same test as stipulated in  6.3.4. 2. The highest test temperature  set out  in 
Table s 3 to 6 should be applied to each category of linings.  
 
Note: 1)  During each temperature period the disk temperature should be raised 
to the defined test temperature within 1 ,500 rotations.  
 2) The increasin g temperature of the disk depends on the friction. If the 
defined temperature cannot be reached within 1 ,500 rotations , an aided 
heating device can be used.    GB 5763 -xxxx    
 
6.3.4.4  After the highest temperature test and at the temperature decrease of every 
50oC, measure the fric tion of 1 ,500 rotations of the disk until the temperature 
reaches 100 oC, the temperature decrease from the last phase to the next phase 
should be completed within 500 rotations.  
  
6.3.4.5  After the test, take a visual examination of the appearance of the test pla tes 
and the disk friction surface . 
 
6.3.5 Calculation  
  
6.3.5.1   The friction coefficient at each test temperature is calculated using  formula 
(1). 
 
   = Ff.......................................................... (1)  
 
In the formula:  
f - friction  (the average friction value from the second half  of stab le friction  in 
the total friction distance ), N;  
F – the normal force applied on the test plate (the pressure on the plate  × the 
area of the plate ), N. 
 
6.3.5.2  The wear at each test temperature is calculat ed using  formula (2).  
 
  
  
In the formula:  
V - wear, cm3 / (N•m);  
R – distance from the centre of the test plate to the centre of rotating shaft    
(0.15 m);  
n – total rotation number of the disc in the test ;  
A - entire friction area of the test plate , cm2;  
d1 - average thickness  of the test plate before the test , cm;  
d2 - average thickness  of the test plate after the test , cm;  
fm - overall average friction  during  the test, N.  
 
Note: The  result of the wear (V) should not be a negative value . 
 
6.4 Braking performance test  
 
6.4.1.1  The braking performance test for linings used in cars should be  carried out 
according to  the provisions of  QC / T 564 -1999 . 
 
6.4.1.2  The braking performance test for linings used in goods vehicles and buses 
should be  carried out according to  the provisions of  QC / T 479 -1999 . 
 
6.5 Shear strength performance test  
   GB 5763 -xxxx    
The shear strength test should be  carried out according to  the provisions of  GB 
/ T xxxx Road vehicles - Brake linings - Shear strength test method of disk 
brake pad  and drum brake shoe assem bly. 
 
6.6 Impact strength performance test  
 
6.6.1 Test sample  
 
6.6.1.1  Test samples should be taken from the middle of the product , perpendicular to 
the direction of friction.  Take 5 samples  for each test.  
  
6.6.1.2  The length  of the sample should be  55 mm ± 0.5mm, the width  6 mm ±  
0.2mm, and the thickness 10 mm ± 0.2mm . The area of the sample ’s width 
direction is the pressure area of the product. The dimension of the sample is 
shown in Figure 1.  
  
  
 
Figure 1 – Dimension of Sample  
 
6.6.1.3  The width and thickness of the test sample should  be taken from the arithmetic 
average of 3 points measured in th e middle  of the sample . The thickness of the 
sample should be taken  from the arithmetic average of the width measured on 
the side of two notches . 
 
6.6.2 Test equipment  
 
6.6.2.1  A simple beam support pendulu m impact test machine with impact energy 
grades of 0.9807J and 3.9228J  is used.  
 
6.6.2.2  The dimensions and mutual relation of the pendulum, sample and support are 
shown in Appendix C.  
 
6.6.3 Test procedure  
 
6.6.3.1  Adjust the distance between the pivots to 40 mm ± 0.2mm .  
  
6.6.3.2  Select a suitable pendulum to meet the requirement s set out in  6.5.2.3 . 
 
6.6.3.3  Calibrate the zero point of the dial of the test machine and place  the pendulum 
onto the hook.  
 
6.6.3.4  The sample should be positioned horizontally on the support with the back of 
the notches  receiving the impact load. The impact knife -edge  should strike to 
the whole width line of the sample facing the centre line of the notches.    GB 5763 -xxxx    
 
6.6.3.5  To begin  the test , carefully release the locking hook so as to allow  the 
pendulum to drop down freely . The sample will receive the impact load from 
the pendulum. Read the dial  to find the amount of consumed energy . 
 
6.6.3.6   If the breaking point is not at the notch area the test will be void and the test 
data will be invalid. In this case, r epeat the test with another sample . 
 
6.6.4 Calculation  
 
 The impact strength of the sample is calculated using  formula (3):  
  
  
In the formula:  
 k- impact strength  of the sample , J/cm2; 
Ak – consumed energy by the sample, J;  
b - width of middle area of the sample , cm;  
d – residual thickness at the sample ’s notch area , cm.  
 
6.7 Swell test  
 
 The swell test is carried out according to GB/T xxxx.  
 
6.8 Compressibility test  
 
 The compressibility test is carried out according to GB/T xxxx.  
 
7 Inspection rules  
 
7.1  Batching principle  
 
A delivery of linings with the same materials or specification is deemed  as one 
batch. I f the amount is too large, i t can be divided as several smaller batches.  
 
7.2  Sampling method and determination rules  
 
7.2.1 The appearance and dimension deviations of the linings should be checked  
through random sampling inspection s. Apply the normal single sampling 
procedure with  the special inspection level S -4 and AQL value of 2.5 in 
accordance with GB/T 2828 . The sampling number for different batches, the 
determinant of qualified or unqualified should con form to the provisions  set 
out in Table 9.  
 
Table 9  
Batch quantity  Sampling number  Qualified determinant 
number  Unqualified determinant 
number  
 150 
151to 500 
501to 1200  
1201 to 10000  
10000  8  
13  
20  
32  
50  0  
1  
1  
2  
3  1 
2  
2  
3  
4    GB 5763 -xxxx    
 
7.2.2 The friction performance, shear strength (bonding type), swell, compressibility 
and impact strength  should be  randomly sampled according to the provisions 
set out in Table 10. If the friction performance and impact strength of every 
sample meet s the requirement of this standard, th e batch of product s is deemed 
to have  qualified; if the arithmetic average of the shear strength (bonding type), 
swell and compressi bility of all samples meet the requirement s of this standard, 
the batch of product s is deemed to have  qualified.  
 
If any one test item fails in the above mentioned  test items, further  samples  
should be taken and the test should be  repeat ed. If the test resu lts from the 
repeated tests  meet the requirement s of this standard, th e item is deemed to 
have qualified; if there is still one area in which the product fails , the batch of  
product s is deemed to be  unqualified.  
 
Table 10  
Batch quantity  Friction 
performan ce Shear strength 
(bonding type)  Impact strength  Swell  Compressibility  
 10000  1 5 1 6 6 
 10000  2 10 2 12 12 
 
7.2.3 To carry out the  braking performance test , take any one set of the product 
containing  the same materials and process es and the same product category , 
and carry out the test.  If the test result s meet the requirement s set out in  this 
standard, th e item is  deemed to have  qualified. If the test does not meet the 
requirement s of this standard, take another two sets and repeat the test. If both 
sets meet the requirement s, the item  does  qualif y; otherwise th e item is  
deeme d to be  unqualified.  
  
7.2.4 If all  of the  test items are passed successfully , the product batch is  deemed to 
have qualified. If any one item fails to pass , the product batch is  deemed to be  
unqualified.  
 
7.3  Inspection classification  
 
7.3.1 Final factory inspection  
 
See Table 11 for the final factory inspection items.  
 
Table 11  
Product 
category  Final factory inspection item  Model inspection item  
Category 1  Appearance, dimension, friction performance  Appearance, dimension, friction performance  
Category 2  Appearance, dim ension, friction performance, 
shear strength (bonding type)  Appearance, dimension, friction performance, shear 
strength (bonding type), compressibility, braking 
performance  
Category 3  Appearance, dimension, friction performance, 
impact strength, compressi bility  Appearance, dimension, friction performance, 
impact strength, compressibility, braking 
performance  
Category 4  Appearance, dimension, friction performance, 
shear strength (bonding type), swell, 
compressibility  Appearance, dimension, friction perform ance, shear 
strength (bonding type), swell, compressibility, 
braking performance  
   GB 5763 -xxxx    
7.3.2 Model inspection  
 
See Table 11 for the model inspection items.  
A model inspection should be carried out:  
 
a) when  production is restarted after a long suspension of the product ; 
b) when  materials or process es that  could noticeably  affect the performance  
of the product are altered ; 
c) when  considerable difference s are found between the final factory 
inspection and the last model inspection;  
d) when  the national quality supervision and ins pection authorities  require an 
inspection to be carried out ; 
e) after one year of normal continuous  production.   
 
8 Marking, packaging,  transportation  and storage  
 
8.1  Marking  
 
8.1.1 The manufacturer or trademark, production date or batch number should be 
printed on th e non -working side of linings.  
  
8.1.2 The product name, model specification, name of manufacturer and/or 
trademark, address, product quantity, friction coefficient appointed, packing 
inspection date and code number of this standard should be printed on the 4 
sides of the packing box (case) of linings.  
 
8.2  Packing  
 
8.2.1 The linings should be packed compactly and orderly in clean, dry, rugged ised 
boxes (cases).  
  
8.2.2 The product qualification certificate should be enclosed in  each packing box 
(case).  
 
8.3  Transportation  
 
The li nings should not be damaged or contaminated  by oil or water during 
transportation.  
 
8.4  Storage  
 
The linings should be stored in well -ventilated and dry indoor  locations  with 
even flooring.  
   GB 5763 -xxxx    
 
 
 
Appendix A  
 
(Information  appendix)  
 
Fixed speed friction test m achine  
 
 
 
 
 
 
 
 
1 – belt pulley; 2 – rotating shaft; 3 – shaft cooling water jet nozzle; 4 – cooling water jet nozzle (fine adjustment); 
5 – cooling water jet nozzle (coarse adjustment); 6 – aided heating device; 7 – test plate; 8 – friction disk; 9 – test 
plate support arm; 10 – pressing shaft; 11 – spring for friction measurement; 12 – chain wheel; 13 – lever 
horizontal adjustment device; 14 – load lever; 15 – lever horizontal level indicator; 16 – weight; 17 – oil buffer; 18 
– friction recording drum  
 
Figure A - Fixed speed friction test machine    GB 5763 -xxxx    
 
 
 
Appendix B  
 
(Normative  appendix)  
 
Disk temperature test device and test position  
 
 
 
 
1 – bakelite; 2 – low carbon steel; 3 – thermocouple; 4 – brass; 5 – mica plate; 6 – silver plate; 7 – friction disk; 8 – 
test plate; 9 – temperature measurement device; 10 – temperature measurement position  
 
Figure B - Disk temperature test device and test position    GB 5763 -xxxx    
 
 
 
Appendix C  
 
(Normative  appendix)  
 
Mutual relation of pendulum, test sample and support  
 
 
 
 
Figure C - Mutual relation of pendulum, test sample and support  
 
L – Distance  between support points  
 
 
 
_______________________________  test sample  
impact direction  
pendulum position at impact moment  
pendulum knife  support  
support