brake problem need help - The 1947 - Present Chevrolet & GMC Truck Message Board Network

boozel67 · 06-16-2005, 11:34 PM

i just put a booster master cyl. and prop. valve from a disc truck on my 67 with drums. they work some what but they won't slide the tires. is the prop. valve the problem or poor adjustment. everything else for the brakes is new. thanks for any help adam

**pjmoreland** · 06-17-2005, 12:51 AM

I'm thinking you shouldn't be using the proportioning valve from the disc truck. It is meant to balance the braking force between the discs and the drums. You should probably put your original proportioning valve back on.

cdowns · 06-17-2005, 01:10 PM

i'm also thinking that the disc brake master cylinder doesn't hold enough brake fluid to work with the drum brakes,as well as the proportiong valve issues

06-16-2005, 11:34 PM	#1
boozel67 FORSALE Join Date: Apr 2003 Location: central pa Posts: 95	brake problem need help i just put a booster master cyl. and prop. valve from a disc truck on my 67 with drums. they work some what but they won't slide the tires. is the prop. valve the problem or poor adjustment. everything else for the brakes is new. thanks for any help adam __________________ 1967 chevy 1/2 ton short step

06-17-2005, 01:10 PM	#3
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	i'm also thinking that the disc brake master cylinder doesn't hold enough brake fluid to work with the drum brakes,as well as the proportiong valve issues __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

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06-17-2005, 12:51 AM	#2
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,982	I'm thinking you shouldn't be using the proportioning valve from the disc truck. It is meant to balance the braking force between the discs and the drums. You should probably put your original proportioning valve back on.



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