C-10 brake pedal problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mr Twister · 10-30-2019, 10:25 PM

Hi
I have a 1972 C-10 4x4 brake problem I need some help with please. The break pedal falls to the floor about I out of 15 times I use the breaks. If I pump it a few times it comes back up. I installed a new, not rebuilt, master cylinder and bled the lines. Much better pedal now but stills falls to the floor occasionally. I don't see any line leaks. Could the proportioning valve be causing this?
This is not a show truck. I've had it about 35 years and three motors later it's still on the job.
Any advice would be appreciated.
Thanks!

10-30-2019, 10:25 PM	#1
Mr Twister Registered User Join Date: Jan 2014 Location: Boyertown, PA Posts: 13	C-10 brake pedal problems Hi I have a 1972 C-10 4x4 brake problem I need some help with please. The break pedal falls to the floor about I out of 15 times I use the breaks. If I pump it a few times it comes back up. I installed a new, not rebuilt, master cylinder and bled the lines. Much better pedal now but stills falls to the floor occasionally. I don't see any line leaks. Could the proportioning valve be causing this? This is not a show truck. I've had it about 35 years and three motors later it's still on the job. Any advice would be appreciated. Thanks!



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