Brake question??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kevmic28 · 12-13-2010, 05:45 PM

70 GMC drum brakes non powered.
I have replaced in the last year:
Master cylinder
All 4 wheel cylinders
All new rubber hoses
Now question is:
The other day I was driving and the pedal went to the floor. I let off and pumped it once and it was back to normal. Now occasssionally it will do it but not regularly. No leaks anywhere. Reblead the system. adjusted the adjusters to make sure they were where they were suppose to be. Brake pads are good. looked inside the brakes to make sure the wheel cylinders are not leaking.
What could be causing this? Bad master cylinder possibly?

12-13-2010, 05:45 PM	#1
kevmic28 Registered User Join Date: Jun 2009 Location: Arlington Texas Posts: 602	Brake question??? 70 GMC drum brakes non powered. I have replaced in the last year: Master cylinder All 4 wheel cylinders All new rubber hoses Now question is: The other day I was driving and the pedal went to the floor. I let off and pumped it once and it was back to normal. Now occasssionally it will do it but not regularly. No leaks anywhere. Reblead the system. adjusted the adjusters to make sure they were where they were suppose to be. Brake pads are good. looked inside the brakes to make sure the wheel cylinders are not leaking. What could be causing this? Bad master cylinder possibly? __________________ 1970 GMC truck 1988 Harley 1200 Sportster

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