1988-1998 Chevy OBS Truck Master Cylinder Upgrade to NBS Style for 4 Wheel Disk Brake Conversion
Channel: Laurenceville Garage
Date: 2022-01-13

Part 17:  Back around part 12, the 1991 Chevy OBS project truck got a rear disk brake upgrade. When installing rear disk brakes in place of the factory installed drum brakes, there needs to be a way to modulate the pressure from front to rear. This has changed when the rear disks were added. There are 2 basic ways: add a proportioning valve inline to the rear brakes or upgrade the master cylinder to a disk brake style. Both can work.

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Several key takeaways: 
1) It's a pretty straight forward swap. Mainly you need a small adapter to adapt the larger front brake line to the new master cylinder.
2) You can bend the existing brake lines from the distribution block (on non-abs equipped trucks) or the abs module on newer trucks. BE CAREFUL not to kink or damage the existing lines. If you do, you get to to find new ones!

New item used in this video with links: 
1)  ACDelco Professional 18M1159 Brake Master Cylinder Assembly $85.88
https://amzn.to/3HXCk8U
2) Autozone  Brakelines Brake System Adapter BLF-26C $4.19
https://www.autozone.com/brakes-and-traction-control/brake-line-fitting/p/brakelines-brake-system-adapter-blf-26c/835276_0_0
3) AutoZone DOT 4 Brake Fluid 32 ounce $9.49
https://www.autozone.com/brake-and-power-steering-fluid-additives/brake-fluid/p/autozone-dot-4-brake-fluid-32-ounce/666763_0_0
Total for this episode: $99.97


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
Part 13 Pulling engine/trans + clutch/flywheel $316.47
Part 14 Steering shaft upgrade   -$17.64
Part 15 Front suspension removal + LS motor mounts $113.99
Part 16 New front suspension/steering install parts $359.02
Part 17 OBS to NBS master cylinder upgrade $99.97
TOTAL PROJECT $4676.88

Disclaimer: This video is intended for entertainment use only, if in doubt as to your mechanical ability, consult a professional to perform the needed work. 
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