How To 1988-1998 Chevy OBS Truck LS Swapped Rear Disk Brake Conversion
Channel: Laurenceville Garage
Date: 07/10/2021

Part 12: The 1991 Chevy OBS project truck gets rear disk brakes!  The disc brake  brackets are from Cunningham Machine. They make brackets to mount factory parts for a “low buck” alternative to the “rear disk brake kits”. With the purchase of the brackets, a parts list is included for the parts you will need to put together your own rear brake kit. It is a bit more work, but is it less expensive than a kit?  Let's find out. 
NOTE:  To learn how to adjust your rear brake calipers please go to my FB link below. On 5-22-24, I added the directions on how to adjust these calipers so they will function properly. If installed with loose clearances, they will not perform as desired. 

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Speed bleeders were added to the calipers but failed to show in the video.
The final cost…I added tools and supplies needed although you could rent tools and might already have the supplies. you could put brakes on your  truck for about $425. That cost also includes core charges which, if I had some old cores to turn in would have saved me $60. That is way less than any kit, even when you have to add parking brake calipers. And, includes rear diff fluid, gasket sealer and rear seals (which are not in a kit).
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New item used in this video with links: 
1) Rear disk brake brackets  $130 + s/h $8.25 = $138.25
https://www.cunninghammachine.com/product/single-caliper-disc-brake-adapter-10-drum-parking-brake/
2) ACDELCO rotor part# 18A656A   $22.79 x2 = $45.58
https://www.rockauto.com/en/moreinfo.php?pk=3864507&jsn=271
3) ACDelco hydraulic brake hose (1)  #18J4290 $11.39
https://www.rockauto.com/en/moreinfo.php?pk=2159962&jsn=275
4) ACDelco hydraulic brake hose (1) #18J1577  $12.34
https://www.rockauto.com/en/moreinfo.php?pk=667779&jsn=279
5) Centric brake pads #10202020  $11.40
https://www.rockauto.com/en/moreinfo.php?pk=1277967&jsn=283
6) Cardone brake caliper #184138 $46.89 + core $30.60 = $77.49
https://www.rockauto.com/en/moreinfo.php?pk=21616&jsn=287
7) Cardone brake caliper #184139 $47.99 + core $37.00 = $84.99
https://www.rockauto.com/en/moreinfo.php?pk=21618&jsn=291
8) Dorman Banjo bolt (x2) $2.32 = $4.64
https://www.rockauto.com/en/moreinfo.php?pk=11544&jsn=295
9) Rear axle seal Timken 4762N x2 $6.21
https://amzn.to/3uRohMO
10) Hard brake line 12” #PA312 $3.81
https://www.oreillyauto.com/detail/c/american-grease-stick/american-grease-stick-steel-polyvinyl-fluoride-pvf-12-inch-brake-line/ags0/pa312/v/a/3055/automotive-truck-1991-chevrolet-c2500-pickup-rwd?q=pa312&pos=0
11) Hard brake line 20” #PAX-320 $5.69
https://www.autozone.com/brakes-and-traction-control/brake-line/p/brakelines-steel-tubing-pax-320/216044_0_0
12) 85W-140 gear oil 1 qt. x3 $6.99= 13.98
https://www.autozone.com/greases-and-gear-oil/gear-oil?filterByKeyWord=stpgo85w140qt&fromString=search&isIgnoreVehicle=false&isSearchByPartNumber=true
13) Dorman cable stops 03336 $4.49
14) Milwaukee 9/16” drill bit  $14.99
https://www.acehardware.com/departments/tools/power-tool-accessories/drill-bits/2809481
15) Dorman  12702 Speed Bleeder M10X1.5 X32 $11.19
16) ACDelco rear center brake hose 18J2064 $10.60
https://www.rockauto.com/en/moreinfo.php?pk=7637704&cc=1031230&pt=1792&jsn=524
16) Brake bleeder rubber caps $7.45
17) Versachem 77739 Mega Blue Silicone - 3 oz. $8.27
https://amzn.to/3FtgNEw
18) OEMTOOLS 25440 Professional Tube Bending Pliers for Brake Lines 5/16", 3/8", 3/16", and 1/4", Steel $19.00

tax/s/h  ~$60
total $544.16
Running total of $$ for project Shop Truck:
Part 1 Truck total price $1,308.00 
Part 2 and 3 (control arms) $230.76 
Part 4 Front brake/spindle rebuild $196.93 
Part 5 Cost of Donor + parts sold $265.00 
Part 6 Engine parts $438.93 
Part 7 oil pan issues $45.04 
Part 8 oil diverter $27.01 
Part 9 Truck bed removal $00.00 
Part 10 Rear suspension lowering/rebuild $226.84
Part 11 LS fuel pump/hose upgrade  $99.99 
Part 12 Rear disk brake conversion $544.16
TOTAL PROJECT $3805.07
Disclaimer: This video is intended for entertainment use only, If you lack skills, consult a professional to perform the needed work. 
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