Proportioning Valve on 68 GTO - Pontiac GTO Forum
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post #1 of 3 (permalink) Old 04-21-2018, 08:57 PM Thread Starter
 
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Proportioning Valve on 68 GTO

For those of you running headers, have you had any problems with the proportioning valve? I bled my breaks before I took my car out for it's first drive in 19 years. The breaks were fine before I left but about 5 mins into driving it I noticed the breaks were getting spongy. I know the valve is way to close to the headers and I will be removing the headers in the future but for now I need to know if any has encountered this problem and had to relocate their valve and if so to where. I have attached a pic of my set up as I bought the car.

Any help would be greatly appreciated.

Dean
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post #2 of 3 (permalink) Old 04-21-2018, 09:20 PM
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Yepper, guilty as charged on my 69. I moved mine from the inside of the driver side frame rail to the top of it.
Also, unless 68's and 69's are different, that's not a proportioning valve. It's a distribution block. There's a plunger in the middle between the two chambers that slides to one side if the pressures aren't equal and activates the brake warning light.

Bear

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post #3 of 3 (permalink) Old 04-21-2018, 10:45 PM Thread Starter
 
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Yes Sir you are correct. In the future I will be converting the car to 4 will disc and I'll be using the Ram Air exhaust manifolds to help with clearance and fitment issues.

Thanks for the help Bear.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Exhaust, Suspension, Alignment, Fuel Tank and Brakes.

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