What parts will I need beside the differential with the rear disc brakes?

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Derrick Haddock
'85 TA 305 TPI 700R4
'93 Blazer 4.3L Vortec 4L60E

 

Proportioning valve

 

That's it?!? The proportioning valve? What about the master cylindar? Is the front-to-rear brake line on the rear-drum cars the same as the rear-disc? This swap sounds almost too easy. Can anyone confirm?

Roy

 

Okay if you are going from drum to disc and the disc brakes are older then 88 you need a diffrent master, if the brakes are 89 and new (aluminum) the masteris the same as the disc, you will need a p valve, new e brakes cables and brake lines. That is all you will need besides brake fluid and pads. I ran the 88 and older on the same master cylinder that I ran my drums and my current 89 and up brakes on and I had no problem.

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.

 

Roy, that front-to-rear brake line seems to differ between years of f-bodies. So an '87 drum-equipped car would have the same front-to-rear brake line as an '87 disc-equipped car.

It's when you do something like I did, and put an '84 rear axle on an '86 car. The axles are all the same; what matters is the year of the proportioning valve. The '84 prop valve didn't meet up with my '86 brake line.

An '86 prop-valve probably would've. I think GM wanted about $80 for it.

I just took the front-to-rear brake line from another junkyard '84 car.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

The vavle for a 88 iroc with disc is the same as the early 89 model for disc's they are diffrent for drum cars though.