FINAL DRAFT UGANDA 
STANDA RD  
  FDUS 2174  
First  Edition  
2020 -mm-dd 
 
 Reference number  
FDUS 2174 : 2020 
© UNBS 2020   
  
Motorcycles and mopeds — Brake shoes and lining assembly 
— Specification  
 FDUS 2174 : 2020  
ii © UNBS 2020  – All rights reserved  
 Compliance with this standard does not, of itself confer immunity from legal obligations  
A Uganda Standard does not purport to include all necessary provisions of a contract. Users  are 
responsible for its correct application  
© UNBS 2020  
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any 
form or by any means, electronic or mechanical, including photocopying and microf ilm, without prior written 
permission from UNBS.  
Requests for permission to reproduce this document should be addressed to  
The Executive Director  
Uganda National Bureau of Standards  
P.O. Box 6329  
Kampala  
Uganda  
Tel: +256 417 333 2 50/1/2 
Fax: +256 41 4 286 123  
E-mail: info@unbs.go.ug  
Web: www.unbs.go.ug  
 FDUS 2174 :2020  
© UNBS 2020  – All rights reserved  iii 
 Foreword  
Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade , Industry and 
Cooperatives established under Cap 327 , of the Laws o f Uganda , as amended .  UNBS is mandated to co -
ordinate the elaboration of standards and is  
(a) a member of International Organisation for Standardisation (ISO) ,  
(b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and  
(c) the Nat ional Enquiry Point on TBT  Agreement  of the World Trade Organisation (WTO).  
The work of preparing Uganda Standards is carried out through Technical Committees. A Technical 
Committee is established to deliberate on standards in a given field or area and con sists of key stakeholders 
including government, academia, consumer groups, private sector and other interested parties.  
Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the 
general public for comments. Th e committee reviews the comments before recommending the draft standards 
for approval and declaration as Uganda Standards by the National Standards Council.  
The committee responsible for this document is Technical Committee UNBS /TC 08, Transport and 
commun ication . 
 FINAL DRAFT UGANDA STANDARD  FDUS 2174 : 2020  
 
© UNBS 2020  – All rights reserved  1 
 Motorcycles and mopeds — Brake shoes and lining assembly 
— Specification  
1 Scope   
1.1 This Final Draft Uganda Standard specifies requirements and test methods  of motorcycle and moped 
brake shoes and lining assemblies.  
1.2 This standard applies to two -wheeled  motorcycles and mopeds (hereinafter referred to as motorcycles) 
using a bonded brake shoe and lining assembl y. 
1.3 This standard does not apply to brake components and brake lining assemblies for motorcycle racing . 
2 Normative references   
The following referenced documents are referred to in the text in such a way that some or all of their content 
constitutes re quirements of this document. For dated references, only the edition cited applies. For undated 
references, the latest edition of the referenced document (including any amendments) applies.  
ASTM B85/B85M,  Standard specification for aluminium -alloy die -castings 
ISO 8709 , Mopeds  — Brakes and brake systems — Tests and measurement methods  
3 Terms and definitions   
For the purposes of this document, the followi ng terms and definitions apply.  
ISO and IEC maintain terminological databases for use in standardization at the fo llowing addresses:  
— ISO Online browsing platform: available at http://www.iso.org/obp  
3.2  
brake shoes  
brake  part on which brake lining is bonded  
3.3  
brake lining  
friction al material bonded onto the brake shoe  
3.5  
coefficient of friction  
ratio of frictional force (f) to force (F) applied  to the test piece  
3.6  
specified frictional coefficient allowable deviation (Δµ)  
allowable  value of the difference between the actual mea sured value of the friction coefficient of the brake 
lining and the specified value of the friction coefficient confirmed by both the supplier and the buyer  FDUS 2174 : 2020  
2 © UNBS 2020  – All rights reserved  
 3.7  
wear  rate (ɤ ) 
ratio of volume wear (T) to product of friction (f) and friction dis tance (m)  
4 Requirements  
4.1 General requirements  
4.1.1  The brake shoe assembly shall be manufactured in accordance with the provisions of this standard . 
4.1.2 The dimensions and mounting dimensions of the brake shoe assembly shall comply  with the 
requirements of this standard . 
4.1.3  If the brake shoes are made by casting, they shall be  treated as aging . 
4.2 Materials  
Aluminium -alloy die -casting for brake shoes shall comply with ASTM B85/B85M  
4.3 Surface  quality  
4.3.1 Brak e shoe 
4.3.1.1 There shall be no cracks, under -casting and penetrating defects on the surface of the brake shoe 
and the difference in surface height shall be in accordance with the product drawings  (see annex A) or 
technical documents. The defects allowed on the surface shall comply with  the requirements given in Table 1. 
Table 1 — Brake shoe surface quality  
No. Defect type  Requirement  
i.  Top marks  The recess shall not be more than 0.4 mm. No protrusions shall be allowed.  
ii.  Cold partition  Within 5 mm of the edge of the spring hole (including the unfolded length of t he 
defect) . Its length shall not be more than 3 mm.  
iii.  Colour marks  These shall not exceed 15 % of the surface area . 
iv.  Bubbles  The diameter shall not be more than 3 mm. The number shall not be m ore than 
one and shall be less than 3 mm from the edge of the casting.  
v.  Mesh glitch  The height shall not be more than 0.1 mm.  
vi.  Hollow  The depth shall not be more than 0.1 mm.  
vii.  Injury  The depth shall not be more than 0.1 mm.  
 
4.3.1. 2 The gate, flash,  overflow, and partition of the casting shall be cleaned. The depth of damage 
caused by cleaning the casting (breaking gate and overflow tank) shall not be more than 0.5 mm and the 
width shall not be more than 0.5 mm . 
4.3.2  Brake plate  
4.3.2.1 The brake plate shall not have cracks, scratches, bubbles, missing edges, corners, unevenness, 
distortion, among others that affect performance . FDUS 2174 : 2020 
© UNBS 2020  – All rights reserved  3 
 4.3.2.2 The surface of the brake lining shall be free of oil, and the non -adhesive shall be free of residual  
glue. 
4.4 Friction performance   
4.4.1 The frictional performance of the brake lining and its allowable deviation and wear rate  shall comply 
with the requirement s given in  Table  2. 
4.4.2  The test piece shall not show c racks and protruding defects after the test .  
Table  2 — Friction performance  
Parameter  Requirement  
Test temperature a, ºC 100 150 200 250 300 
Coefficient of friction b, µ 0.30 - 0.60 0.30 - 0.60 0.30̴̴̴̴̴̴̴          0.60 0.25   0.60 0.25   0.60 
Specified friction coefficient 
allowable deviation , ∆µ ±0.08  ±0.10  ±0.10  ±0.10  ±0.12  
Wear rate c, ɤ, 10 cm2/(N.m)  0.00̴̴̴̴̴̴̴        0.50 0.00̴̴̴̴̴̴̴          0.50 0.00̴̴̴̴̴̴̴          0.70 0.00̴̴̴̴̴̴̴          1.20 0.00̴̴̴̴̴̴̴          1.50 
a temperature of the frictional surface of the test machine disc . 
b the range includes the allowable deviation experiments .  
c Only for the brake lining assembly  
 
4.5 Bonding requirements   
4.5.1 After the brake lining is bonded onto the brake shoe, the circumferential displacements shall not be 
more than 1.5 mm. The two sides of the brake lining shall not be more than 0.3 mm above (or below) the 
brake shoe . 
4.5.2  The brake lining bonded onto the b rake shoe shall be tight and firm with no cracks or brake linings 
falling off. The bonding area shall not be less than 80  %. 
4.6 Strength  
The bond shear strength between the brake lining and the brake shoe shall not be more than 3.5 N/m2 × 106 
N/m2. 
5 Test methods  
5.1 Dimension s 
The dimensions and installation dimensions of the brake shoe assembly shall be checked using inspection 
tools and measuring tools . 
5.2 Surface quality and marking  
The surface quality shall be determined by v isual inspection and measurements by calibrated instruments.  FDUS 2174 : 2020  
4 © UNBS 2020  – All rights reserved  
 5.3 Friction performance  
Brake linings friction performance shall be determined  in accordance with ISO 8709 . 
5.4 Bonding requirements  
The circumferential and height difference after bonding shall be measured using calibrated equipment . 
5.5 Strength  
Brake lining bonding shear strength shall be  determined in accordance with ISO 8709 . 
6 Storage  
6.1 The storage of brake shoe assembly shall not cause damage or contamination on the outer surfa ces. 
6.2 Under normal storage conditions, the brake shoe assembly shall not be c orroded . 
7 Transport  
During the transportation and handling process, the brake shoe assembly shall not be damaged and 
contaminated by oil and water . 
8 Packaging  
8.1 Before pack aging , the brake shoe assembly shall be cleaned, and the surface of the inserted material 
shall be made rustproof . 
8.2 The brake shoe assembly shall be tightly packed into a dry, rugged package (box).  
8.3 The brake shoe assembly and brake  lining  assembly o f the same model size shall be installed in each 
package (box). A pair of paired brake shoe assemblies and brake lining assemblies  shall also be loaded when 
desired by the user . 
8.4 When the pairing process is used to manufacture the outer working surface o f the brake shoe 
assembly, it shall be packaged according to the same batch . 
9 Marking  
9.1 The manufacturer’s name (code) or trademark, (or other mark agreed upon by the supplier and the 
buyer) shall be legibly and indelibly marked on the working surface o f the brake shoe assembly . 
9.2 The following specific labelling requirements shall be legibly and indelibly marked on the package:  
a) product name;  
b) model specification;  
c) manufacturer’s name and /or trademark;  
d) manufacturer’s  address ; and 
e) standard number  (US 2174 ). FDUS 2174 : 2020 
© UNBS 2020  – All rights reserved  5 
 Annex  A 
(normative)  
 
Brake shoe assembly technical drawings  
 
Figure A.1  — Technical drawings of brake shoe assemblies  FDUS 2174 : 2020  
6 © UNBS 2020  – All rights reserved  
 Bibliography  
QC/T226 -2014, Specification of brake shoes assembly and brake lining ass embly for motorcycles and  
mopeds   
 FDUS 2174 : 2020 
© UNBS 2020  – All rights reserved  8 
 Certification marking  
Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards 
(UNBS) Certification Mark shown in the figure below.  
The use of the UNBS Certification Mark is governed by the Standards Act, and the Regulations made 
thereunder. This mark can be used only by those licensed under the certification mark scheme operated by 
the Uganda National Bureau of Standards and in conjunction with the relevant Uganda Standard. The 
presence of this mark on a product o r in relation to a product is an assurance that the goods comply with the 
requirements of that standard under a system of supervision, control and testing in accordance with the 
certification mark scheme of the Uganda National Bureau of Standards. UNBS mar ked products are 
continually checked by UNBS for conformity to that standard.  
Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda 
National Bureau of Standards.  
 
 FDUS 2174 : 2020   
 
ICS 43.140  
Price based on  nn pages  
© UNBS 2020 – All rights reserved