Question about 1989 Volkswagen GTI

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I have a 1989 gti, the front brakes were locking up after I drove it for a few minutes, so I went ahead and replaced, pads, rotors, calipers, caliper pins, master cylinder, and brake lines, however the brakes are still locking up after a few minutes, you can't even push the car, yet after a few minutes the brakes release. Help!

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  • donbwrenn Aug 01, 2009

    Yes the flex brake hose to the caliper. Someone noted to me that this could be a pushrod issue as the brakes release after about 30 minutes. Even if I push the brakes a few times to bleed the system they will lock up. Also when I put on the c clamp to push the caliper in, as soon as I released the c clamp to place the caliper in position on the pads, the caliper started to come back out as though I was pushing on the brake pedal.

  • donbwrenn Aug 01, 2009

    yes

  • donbwrenn Aug 05, 2009

    It was the push rod in the brake booster. It was set really far out and just needed to be adjusted so it would not put pressure on the master cylinder all the time.

  • Jonny May 11, 2010

    When you say "and the brake lines" did you change the flex lines to the calipers ?

  • Jonny May 11, 2010

    When you say "and brake lines" did you change the flex lines ?

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I bought the master cylinder and the voss cylinder in 1 unit so the push rod should already be ajusted because its already sealed in or so i think 1 ov the master cylinders that i bought what i av taken off the car having the same problem with it the rubbers inside was no good so now iam woundering if this units doing the same ? if i put a brand new master cylinder on would i then after ajust the push rod??

Posted on Aug 26, 2009

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I had this same problem on my 90 Jetta but it was the master cylinder that was the problem, I first replaced the master cylinder because it was leaking badly. The new master cylinder I put on was a manufactured defect, the internal piston inside the master cylinder was not machined enough (10mills too long) so when you applied the brakes the piston would not move far enough to release the brakes but after 20 mins they would slowly release themselfs just as you said your brakes do. The only thing that can cause this problem (if you have changed everything) is the master cylinder or the brake pedal itself, did you do anything to the brake pedal or near it to change its movemment ? Make sure the brake pedal once depressed returns fully to the float position where it should be. I would try another master cylinder preferrable a used one from another vdub the same as yours, eg year,model and country of origin some parts are different if it was made in Mexico or Germany. Its going to be a pain in the *** to have to replace the master again but I see no alternative. There is one more thing you can check I just thought of....check all your brake lines from the master to the calipers for any signs of dents or sharpe curves if the metal brake line is bent too much it will restrict the flow of the fluid returning to the master cylinder after brake pedal release but not during braking. Good luck

Posted on Aug 01, 2009

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