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Dino brake master cyl. issue
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Posts: 16Registered: Oct 2002
shross
Junior Member


Wednesday, August 19, 2009 1:30 PM

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Last year I had a very soft pedal when braking and the brake warning light would come on. So we decided to replace the brake master cylinder. Purchased it from GT and installed it. All seemed fine except when driving the car for more than a few minutes, I was travelling down the road (I had been driving normally for about 15 minutes with no problem) and touched the brake pedal. There was absolutely no travel; the pedal was like stepping on a boulder. Then all 4 wheels locked up and the car stopped - it wasn't going anywhere. The pedal remained rock hard with no travel.

I had the car towed home and a few hours later I had pedal travel. Now, we need to find out what the problem is. One theory is that the new master is defective and there is a problem with the pressure release that would not allow fluid to go back to the reservoir. This might make some sense as the brake lock up didn't occur until the car was nice and warmed up. Also, I recall the pedal got progressively harder as I drove along. Another theory is that the bore in the cylinder is now mismatched to the servo???

Any ideas for a fix or should I just try another new master cylinder?

Thanks



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Posts: 153Registered: Feb 2004
Tom Manchester
Member


Friday, August 21, 2009 10:21 AM

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the symptom is characteristic of a blocked return port in the master cylinder. It should be able to be cleaned out and function properly.

TM




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