Weak Brake Pedal - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**DreamRyder1963** · 09-06-2013, 07:42 PM

I am having trouble with the brakes on my brother's 1969 GMC C15. The truck stops but the brake pedal soft and under hard braking the wheels don't lock up. I have replaced the master cylinder and the rear left wheel cylinder (busted bleeder valve). I also swapped out the portioning valve with an old one I had lying around. The rear shoes and drums looked good. I believe the rear brakes are not getting the correct amount of pressure. When I bled the brakes the front cylinders shot out a stream of fluid but the rear cylinders only dribbled out. Is there something that could be causing this?

09-06-2013, 07:42 PM	#1
DreamRyder1963 Senior Member Join Date: Jul 2012 Location: Knoxville, TN Posts: 499	Weak Brake Pedal I am having trouble with the brakes on my brother's 1969 GMC C15. The truck stops but the brake pedal soft and under hard braking the wheels don't lock up. I have replaced the master cylinder and the rear left wheel cylinder (busted bleeder valve). I also swapped out the portioning valve with an old one I had lying around. The rear shoes and drums looked good. I believe the rear brakes are not getting the correct amount of pressure. When I bled the brakes the front cylinders shot out a stream of fluid but the rear cylinders only dribbled out. Is there something that could be causing this? __________________ 1971 Chevy C10 Cheyenne (sold for Mazda) 1963 Chevy Corvair Pro-Touring Project 2012 Mazda 3 i Sport sedan http://www.dracoautodesigns.com/

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