Do prop valves go bad? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TugOwar · 10-02-2004, 10:13 PM

Hi folks,

My 68 GMC 3/4 ton has the factory brake set up, including booster, MS and proportioning valve and I've thoroughly bled the lines.

When I press the brake pedal I have a good pedal but only have rear brakes to start with. Then the pedal will go on down and suddenly the front brakes will engage.

I'm wondering if the prop valve could be bad. Any ideas?

Thanks

Oh forgot to mention I HAVE adjusted the front brake shoes close to the drum.

10-02-2004, 10:13 PM	#1
TugOwar Registered User Join Date: Sep 2004 Location: Pleasanton, TX Posts: 1,723	Do prop valves go bad? Hi folks, My 68 GMC 3/4 ton has the factory brake set up, including booster, MS and proportioning valve and I've thoroughly bled the lines. When I press the brake pedal I have a good pedal but only have rear brakes to start with. Then the pedal will go on down and suddenly the front brakes will engage. I'm wondering if the prop valve could be bad. Any ideas? Thanks Oh forgot to mention I HAVE adjusted the front brake shoes close to the drum.

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