Please Help with Strange Brake Problem
Thread Starter
Burning Brakes
Joined: May 2003
Posts: 1,056
Likes: 2
From: Elgin Il
Please Help with Strange Brake Problem
The facts:
'89 gets driven a few times a month. Last brake service was 3-4 years
ago.
Car was recently put into daily driver service without a single problem
for several months.
The problem:
After riding over rough highway for extended period, breaks became
spongy on first press, traveling roughly 50% to the floor. Second press
was firm and immediate.
Problem was suggested to be Master Cylinder, and was similar to problem
12 years ago.
Replaced Master Cylinder.
Bled Brakes until fluid was clean. (Old fluid was pretty black).
Problem resolved for 2 days, and has now returned:
Any ideas?
Thanks for the help in advance.
'89 gets driven a few times a month. Last brake service was 3-4 years
ago.
Car was recently put into daily driver service without a single problem
for several months.
The problem:
After riding over rough highway for extended period, breaks became
spongy on first press, traveling roughly 50% to the floor. Second press
was firm and immediate.
Problem was suggested to be Master Cylinder, and was similar to problem
12 years ago.
Replaced Master Cylinder.
Bled Brakes until fluid was clean. (Old fluid was pretty black).
Problem resolved for 2 days, and has now returned:
Any ideas?
Thanks for the help in advance.
Melting Slicks
Joined: Sep 2003
Posts: 3,031
Likes: 74
From: If you don't weigh in you don't wrestle Road America
Re: Please Help with Strange Brake Problem (Clay Assassin)
Sounds like there is air in the system, that's why it builds. The rough/bumpy road might have something to do with it but. Either they didn't bleed all of the air out or you have a leak. Otherwise it wouldn't build like that.
Advanced
Joined: Mar 2004
Posts: 57
Likes: 0
From: Elk Grove Ca
Re: Please Help with Strange Brake Problem (96CollectorSport)
Did you get a new or reman master cylinder. Also did you pre bleed the m/c before you installed it?? If not, you might have scored the rubbers and caused an internal leak. Get another m/c and try again. Chances are you might have gotten a defective one.. It happens..
Also check for leaks in the calipers and if your flex lines might be weak and ballooning when you apply the brakes.
Also check for leaks in the calipers and if your flex lines might be weak and ballooning when you apply the brakes.
Thread Starter
Burning Brakes
Joined: May 2003
Posts: 1,056
Likes: 2
From: Elgin Il
Re: Please Help with Strange Brake Problem (TimBVette)
The fluid level appears to stay the same.
The problem happened BEFORE installation of the new MC.
But did not inmprove after the installation.
I will try bleeding them again, and look for leaks.
Any others? This doesn't make sense.
The problem happened BEFORE installation of the new MC.
But did not inmprove after the installation.
I will try bleeding them again, and look for leaks.
Any others? This doesn't make sense.
Le Mans Master
Joined: May 2003
Posts: 5,362
Likes: 3
From: Delray Beach FL
Re: Please Help with Strange Brake Problem (Clay Assassin)
Had a similar problem. Found out that there was air in the ABS unit. Had a dealership do another brake flush and that fixed the problem.
:cheers:
:cheers:
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Thread Starter
Burning Brakes
Joined: May 2003
Posts: 1,056
Likes: 2
From: Elgin Il
Re: Please Help with Strange Brake Problem (bogus)
Bogus;
Wouldn't a bad booster just make the pedal harder to push taking away the power assist?
I will look for air, you guys have convinced me there has to be air somewhere.....
Thanks for the help
Wouldn't a bad booster just make the pedal harder to push taking away the power assist?
I will look for air, you guys have convinced me there has to be air somewhere.....
Thanks for the help