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#1
01-06-2016, 07:49 PM
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Old Chevy techs, 78 pick-up
I have a 78 Chevy 1/2 ton pick-up with the Silverado and Big 10 package. A few months back I had some brake issues and had a leaking pressure valve at the metering block. Ended up replacing the metering block with one off of a 83 K-10 Blazer. Since then I have not had rear brakes, plenty of fluid going to the wheel cylinders, no air in the lines any where and brake light in the dash stays on at all times. I've even replaced one of the wheel cylinders and have put on new brake shoes but still no rear brakes, front only. Master cylinder is new also and was bench bled prior to install.
Part I need is obsolete from the Chevrolet dearership and no other source for the residual pressure valve like the factory or metering block (I still have the original) and haven't been able to locate one like it in the salvage yards. What is my best option to correcting this and get working rear brakes again? Thanks in advance. Alan Dille
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1971 GTO,72 400, stock bottom end, 670 heads, Lunati BMII cam, headers, iron intake Q-jet, four speed. Best 60 ft 1.806in 2004. Best 1/8th mile e.t. 8.46 with 3.55 open rear 85 Grand Prix, 70 400, casting 62 heads stock rebuild, Turbo 350 trans 78 800 cfm Q-jet modified as per Cliff Ruggles book. 87 F350 6.9 4 speed dually A poor man has poor ways. |
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#2
01-07-2016, 12:28 PM
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the link covers a similar issue, did you try the stomp on the brakes method and bleeding the fronts to get the valve to reset?
http://67-72chevytrucks.com/vboard/s...d.php?t=579574 |
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#3
01-07-2016, 10:17 PM
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Summit sells residual pressure valves, you may have to re-engineer your brake system.
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#4
01-08-2016, 09:37 AM
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By-pass the valve and see how it feels,you might not even need it.
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#5
01-09-2016, 09:21 AM
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The original valve had a rubber plug in the side of it and it blew out. Only having partial braking is not good when I'm hauling hay or pulling the horse trailer. It's a bear on wet roads trying to stop. Think I may have to go with an aftermarket valve back in the original metering block to get this back to the way it was before I started having problems.
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1971 GTO,72 400, stock bottom end, 670 heads, Lunati BMII cam, headers, iron intake Q-jet, four speed. Best 60 ft 1.806in 2004. Best 1/8th mile e.t. 8.46 with 3.55 open rear 85 Grand Prix, 70 400, casting 62 heads stock rebuild, Turbo 350 trans 78 800 cfm Q-jet modified as per Cliff Ruggles book. 87 F350 6.9 4 speed dually A poor man has poor ways. |
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