brake proportioning valve - The 1947 - Present Chevrolet & GMC Truck Message Board Network

flip66 · 08-07-2004, 07:35 PM

Does anybody know what the difference between the 69 proportioning valve with front drum brakes and 71 with front disc is. Will the 69 with drums work if I convert to 72 disc.

LONGHAIR · 08-07-2004, 08:00 PM

There is definately a difference between disc and drum as far as the proportioning valve is concerned. The drum unit has a residual valve that maintains some pressure on the wheel cylinders. The disc does not need or want that pressure.

08-07-2004, 07:35 PM	#1
flip66 Registered User Join Date: Jan 2004 Location: Garland TX Dallas area Posts: 658	brake proportioning valve Does anybody know what the difference between the 69 proportioning valve with front drum brakes and 71 with front disc is. Will the 69 with drums work if I convert to 72 disc.

08-07-2004, 08:00 PM	#2
LONGHAIR just can't cover up my redneck Join Date: May 2004 Location: Columbus OH Posts: 11,414	There is definately a difference between disc and drum as far as the proportioning valve is concerned. The drum unit has a residual valve that maintains some pressure on the wheel cylinders. The disc does not need or want that pressure.



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