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Old 08-25-2010, 08:48 PM   #1
89fc3s
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Default Weird Brakes...

89 GTU w/ TII front calipers.

They grab decently hard but when i press the pedal there is no feedback (supersoft pedal)

other times i can push them as hard as i can and the car will barely stop.

Any suggestions??
Any questions??






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Old 08-25-2010, 09:28 PM   #2
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you swapped out the master cylinder and booster, didn't you?
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Old 08-25-2010, 11:06 PM   #3
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i had all sorts of weird problems with a bad booster before. try swapping another one on
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Old 08-26-2010, 08:40 AM   #4
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The problems with bad boosters, or bad booster lines if you have a turbo, is that they can be intermitant. So, as was already said, swap it out with a known good one and see if the problem goes away. Be advised though, there is a difference in size between the 4/5 lug and the turbo line has a one way valve in it.
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Old 08-26-2010, 06:25 PM   #5
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i swapped the one that was on the car that just caused weak brakes w/ an s4 booster that was still "good" made the brakes better but nowhere near the way they should be.

so its narrowed down to booster?? booster and master cylinder?? it could it be a leak in the line that powers the booster? Just clarifying
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Old 08-26-2010, 08:03 PM   #6
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It could be that you have to adjust the rod that goes into the booster.
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Old 08-26-2010, 09:09 PM   #7
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Adjusting that rod wouldn't correct an intermitant problem. It's something else.

Swap the booster to a known good one so it can be crossed off the list. Then it's down to Master (which I don't think it is) or a bad one way valve.

Are we talking a turbo car here?
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Old 08-26-2010, 11:54 PM   #8
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n/a car TII calipers
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Old 08-27-2010, 05:41 PM   #9
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Quote:
Originally Posted by TitaniumTT View Post
Adjusting that rod wouldn't correct an intermitant problem. It's something else.
Actually it will, I had this issue after I swapped in my 929 booster and master, it would intermittently drag and cause the brakes fade like a mofo, I adjusted it so it was shorter and I no longer have an issue with brake fade.
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