Thread: Brake Issue
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Old June 13th, 2020, 07:49 PM
zoulas zoulas is offline
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Join Date: Jun 2017
Location: NY, NY
Truck: 1965
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Default Brake Issue

Hello again, 1965 GMC Panel 305E

The truck unfortunately sat for a while (my fault.) When to start it today and when I stepped on the brake, the petal sank to the floor with zero pressure. Pumped it 20x, still nothing. Checked master cylinder, empty. Checked for leaks around wheeles, did not see any. Filled the master cylinder with new brake fluid. Pumped the petal 10-15x. I got some resistance but not quite normal. Waited few minutes, the petal sank to the floor again with no resistance.

If I repeat the process I get some resistance but it goes away after few seconds. When I pump it and the resistance builds, if I hold the petal , it keeps the resistance. It's only when I release the petal that the resistance goes away.

I checked for leaks again around the wheeles and did not see any. I checked the master cylinder again and it was full, no fluid loss.

Any ideas?

Thanks in advance.
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