No Breaks Sometimes - Corvette Forum
 
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post #1 of 5 (permalink) Old 05-25-2016, 08:15 PM Thread Starter
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Unhappy No Breaks Sometimes

98 corvette.110.000 miles. ABS has not worked for 3 years. all else fine.
last week no, nadda, zero, breaks...right to the floor.
shut off car. turn ignition back on, breaks fine for a week.
Then out of no where no breaks completely gone again, right to the floor. shut off, turn on ....breaks are fine.
NOTE: master cylinder replaced a few months ago.
any thoughts or help. I am new to Corvette forum
thanks, Richard


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post #2 of 5 (permalink) Old 05-31-2016, 03:39 PM
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Did you totally bleed the brake system of all fluid when you changed the master cylinder?

Does this happen when the car and/or brakes are hot?

Check your brake lines where they may come close to the exhaust - it is possible an exhaust leak can cause the brake fluid to get hot and/or over heat.
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post #3 of 5 (permalink) Old 05-31-2016, 05:54 PM Thread Starter
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Thanks for that input. Brake lines were totally flushed. However it happens when the car has been running a lot {hot}
No exhaust leak. I do not loose breaks every time the car/breaks are hot.
Richard
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post #4 of 5 (permalink) Old 06-01-2016, 01:13 PM
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Well if I was going to offer an educated guess at this point, I would suspect the master cylinder. The braking system is fairly simple actually and if pressure is being released it has to be something like air, fluid compromise or delivery malfunction.

I did not think of your ABS, it is possible the ABS is sending signal to indicate the wheels are locked up and thus releasing the brake pressure from the system? Normally ABS stop working and no signal is transmitted and thus the brake pressure is not release, in this case, perhaps the opposite is happening.

Last edited by Raider4444; 06-01-2016 at 01:15 PM. Reason: Add information
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post #5 of 5 (permalink) Old 06-01-2016, 07:52 PM Thread Starter
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Thank you for the input. Something definitely is causing the breaks/abs/ break pump. possible master cylinder tied to the wheel sensors to get mixed signals and getting so confused it is shutting down. It keeps going back to the ABS module itself even if not working correctly. I have located a ABS unit in Calif so will have that installed in a few weeks after I get a second mortgage to pay for it.
Really appreciate all the feedback . As mentioned I am new and the forum has more knowledge than most mechanics.
Richard


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