1965 Other Pontiac Models brake pedal goes to floor after en

1965 PONTIAC
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GHOSTSHELL74
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Brakes problem
1965 Other Pontiac Models V8 Automatic 180000 miles
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pontiac catalina 65:

after engine start my brake pedal goes too far in before it starts to stop.
with engines turned off the brake pedal feels like normal.
i think my diaphragm check valve may be bad, cause i checked all the other possibilities like Low Brake Fluid Level or Air in the Brake Fluid.

i replaced some parts of the Master Cylinder too, only the check valve is an old one and i can´t find a new.

do you have any other suggestions, where the problem can be?
Aug 1, 2008 at 5:14 AM
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MASTERTECHTIM
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i think your going to find brakes out of adjustment, loose wheel bearings or air in the system.
Aug 1, 2008 at 7:04 AM
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GHOSTSHELL74
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first thx for quick answer!

air is definitely not in the system, checked it well.

why do you mean loose wheel bearings, can you precise this?

thx lot!
Aug 1, 2008 at 12:41 PM
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MASTERTECHTIM
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if you have a loose wheel bearing and the wheel is rocking it compresses the brake piston thus making you have to pump the pedal. i have seen this a hundred times but not on a 65. its always been air, is it possible the porportioning valve is stuck?
Aug 1, 2008 at 6:08 PM
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GHOSTSHELL74
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the whell bearings are not loose,
but last weekend finaly i found the problem, the wheel brake cylinder was broken und filled with brake fluid, so i couldn´t see any leakage.

next week i´ll get new parts, then it should work again.


thx for your help
Aug 5, 2008 at 4:07 AM