rears not grabbing still

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Feb 21, 2004 | 05:11 PM

89mulletbird

Thread Starter

Senior Member

iTrader: (4)

Joined: Feb 2004

Posts: 735

Likes: 7

From: San Diego, CA

Car: 89 GTA

Engine: 6.0L Procharged

Transmission: T-56

Axle/Gears: 4.10

rears not grabbing still

I have a 89 GTA with PBR rear discs. I jacked up the rear end and the brake pedal will not stop my wheels.

1) I adjusted the ebrake, and the ebrake can stop the wheels (barely)

2) I put Speedbleeders on and bled the rear brakes.

3) I have new pads.

4) Fluid flow is good, it squirted out when I bled them.

5) I have to use a C clamp to press the pistons in after I pump the brakes to extend the pistons.

Should I get a caliper rebuild kit?
SHould I also buy new pistons?

Feb 21, 2004 | 05:45 PM

RWB____s

Senior Member

Joined: Sep 2003

Posts: 892

Likes: 0

From: Mo.

Car: Z/28

Engine: 355

Transmission: Turbo 400

Axle/Gears: 3.73

Yep its time for new calipers of some sort. The pistons in my rears corroded and seized once. Just replaced the calipers
and everything was ok again

Feb 21, 2004 | 11:53 PM

89mulletbird

Thread Starter

Senior Member

iTrader: (4)

Joined: Feb 2004

Posts: 735

Likes: 7

From: San Diego, CA

Car: 89 GTA

Engine: 6.0L Procharged

Transmission: T-56

Axle/Gears: 4.10

I think calipers are OK

I am not convinced my calipers are bad.

When I have them removed from the rotor and press the brake pedal, the piston comes out and I have to use a clamp to press it back in.

Could my rear portion of the master cylinder not be giving enough pressure to squeeze the rotor?

Feb 22, 2004 | 12:20 AM

Trickster

TGO Supporter

Joined: Sep 2003

Posts: 6,127

Likes: 12

From: conway, s.c.

Car: 1989 Iroc-Z

Engine: 5.7L TPI

Transmission: 700R4

That would be a function of the proportioning (combo) valve. What kind of shape are the rear caliper guide pins in? Clean with no corrosion, boots not torn?

Last edited by Trickster; Feb 22, 2004 at 12:26 AM.