would a new set of 89 gm rear aluminum calipers fit on my 88 tpi trans am with iron calipers. And would i also have to change the 10.5 inch stock rotors to 11.3 inches. whith a set of new steel brake lines would i feel a dfference over my stock brakes.

 

You need diffrent backing plates, lines, master cylinder, rotors and pads.

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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.

 

I'm curious about the same thing--why do you have to change the brake lines and the master cylinder? I thought they were all the same?

 

I believe the lines coming from the master cylinder will have the incorrect fittings and a slight variation routing depending on the application.

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'84Z28/'92 305TPI
'92 complete rear suspension/PBR disc/Posi/3:42
Light weight 34.5mm stabilizer bar in front
23mm sta. bar in rear
rear lowered 1" by cutting 1 1/4 coils of '84Z28 springs
comp cam, flowmaster
TB coolantbypass/shutoff valve to heater core
MAT relocated
Ram-Air(home-made) gutted air-box
IROC ground effects/wheels GY245/50's
700R4 superior shift kit/ corvette servo(excellent shift kit BTW) Rebuilt engine and transplanted it myself. Love this engine!
LOW performance people should drive low performance vehicles!

 

Master cylinders-- Between 82 and 88, there were two units, the J50 (disc/drum) unit and the J65 (4-wheel-disc) unit.

In 1989, GM used the "original" J50 disc/drum unit for both types of braking systems.

If your '88 t/a had drums, you wouldn't have to change master cylinders to use the '89 discs.

You'll basically be getting the 82-88 disc/drum master cylinder. You can verify these part #'s by going to places like http://www.wrenchhead.com and http://www.carparts.com and http://www.expressautoparts.com. I'd suggest buying it locally though; I bought a rebuilt unit locally and it turned out to be bad, so I just returned it. If I bought it through an online store- what a nightmare that would've been!


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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
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