I just bought my 89 Iroc and the brakes where pulsing so I decided since I have to cut the rotors I would replace the 2 front calipers because they were sticking and do all my brakes. I also replaced the rear pads and bled the whole brake system. I have done this many times before on other cars but never with such bad results. My brakes have a very spongy feel now and I have horrible braking distance. I can't figure it out I got all the air out of the system by bleeding. Can anyone give me a idea why my stopping distance is so bad now? I have done a full break-in on the pads and it’s still bad.

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1989 Iroc-Z Blue T-Tops
Lightly Moded:
Headers, Rebuilt B&M 700R-4 tranny, Airfoil, K&N's

[This message has been edited by 89 Iroc Z (edited August 28, 2001).]

 

has anyone had this probem before?

 

I had a similar problem on a foreign car. We bled the brakes by pumping the pedal. The problem with this is that when you open the bleeder and the brake pedal goes to the floor, you are going past the normal operating range of the piston in the master cylinder. On my car, there was debris in the MC that didn't normally come in contact with the MC piston. This scored it up, making it leak. When we finished the bleeding, we couldn't get any pedal feel at all. The fix was a new master cylinder, and complete rebleeding of the brakes. We used a vaccuum bleeder the second time.

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88 IROC with cobbled together (not by me)drivetrain, 86 (?) TPI unit on an '83 305,CE subframe connectors, Edelbrock strut tower brace, polygraphite bushings all around...it handles like a dream, but man is it hard to push!!

 

I have never heard of a vacume bleader before. Is it just a hand pump the sucks the brake fluide out of the line from the bleeding vavle?

 

Most likely, the MC ran dry at some point while you were working on it, and got air into itself; and since the lines don't attach to it at the highest point of the actual hydraulic cylinders, it is impossible to completely bleed the MC itself while it's on the car. Some air will always remain trapped because of the angle it sits at.

You need to "bench bleed" the MC with it held level so that the air in it can be expelled.

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"So many Mustangs, so little time..."
ICON Motorsports