Different prop valve power vs. non-power brakes? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

brossow · 10-04-2008, 07:52 PM

Wondering if there's a difference in proportioning valves between non-power and power brakes for my '72. I'm converting to PB and hope to save the expense of buying yet another part if I can use my existing prop valve.

Thanks,
Brent

Longhorn Man · 10-04-2008, 08:54 PM

the valve is the same, a booster does nothing to the hydraluics of the system.

brossow · 10-04-2008, 11:44 PM

That's what I thought but didn't want to take a chance when it comes to my brakes. Thanks!

Longhorn Man · 10-05-2008, 12:00 AM

smart man. Too many ppl roll the dice.

brossow · 10-05-2008, 12:06 AM

Quote:

Originally Posted by Longhorn Man

smart man. Too many ppl roll the dice.

For sure. I've got WAY too many hours into this to take chances -- and that's with it still not yet even a rolling chassis again! Thanks again.

ED67C20 · 10-05-2008, 01:03 PM

How much difference is there in the brake boosters? I want to convert my 67 C20 with drums all around to power brakes. I found a complete power brake setup at a junkyard from a disc brake C20. Is this not a good booster to use? Should I use a C20 drum brake booster only? The junkyard crushed the rest of that truck, I want to convert to front disc someday, but you know the whole time and money thing. If my truck dies I'm riding a bicycle!

brossow · 10-05-2008, 02:10 PM

Whatever you go with, be sure to use the original drum brake prop valve until you make the upgrade to discs up front.

ED67C20 · 10-05-2008, 03:53 PM

Thanks brossow, I thought they were different from looking at the NAPA auto parts website. Just wanted to be sure since it is brakes like you said. I know C10 is diffenent found a lot of those in the past. I found disc setup on a 77 C20 but I think the tie rod ends are bigger. What do you think?

Longhorn Man · 10-05-2008, 07:18 PM

The boosters aren't the same.

10-04-2008, 07:52 PM	#1
brossow Amateur Rust Fighter Join Date: Sep 2007 Location: Mankato, MN Posts: 1,087	Different prop valve power vs. non-power brakes? Wondering if there's a difference in proportioning valves between non-power and power brakes for my '72. I'm converting to PB and hope to save the expense of buying yet another part if I can use my existing prop valve. Thanks, Brent __________________ Brent '72 Chevy SWB stepside - [ Build Thread ] '79 ChevMC SWB fleetside - [ Build Thread ] '64 Chevy SWB fleetside & '66 Chevy SWB stepside (waiting in the wings...)

10-04-2008, 08:54 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Different prop valve power vs. non-power brakes? the valve is the same, a booster does nothing to the hydraluics of the system.

10-04-2008, 11:44 PM	#3
brossow Amateur Rust Fighter Join Date: Sep 2007 Location: Mankato, MN Posts: 1,087	Re: Different prop valve power vs. non-power brakes? That's what I thought but didn't want to take a chance when it comes to my brakes. Thanks! __________________ Brent '72 Chevy SWB stepside - [ Build Thread ] '79 ChevMC SWB fleetside - [ Build Thread ] '64 Chevy SWB fleetside & '66 Chevy SWB stepside (waiting in the wings...)

10-05-2008, 12:00 AM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Different prop valve power vs. non-power brakes? smart man. Too many ppl roll the dice.

10-05-2008, 01:03 PM	#6
ED67C20 Registered User Join Date: Aug 2006 Location: spokane, washington Posts: 37	Re: Different prop valve power vs. non-power brakes? How much difference is there in the brake boosters? I want to convert my 67 C20 with drums all around to power brakes. I found a complete power brake setup at a junkyard from a disc brake C20. Is this not a good booster to use? Should I use a C20 drum brake booster only? The junkyard crushed the rest of that truck, I want to convert to front disc someday, but you know the whole time and money thing. If my truck dies I'm riding a bicycle!

10-05-2008, 02:10 PM	#7
brossow Amateur Rust Fighter Join Date: Sep 2007 Location: Mankato, MN Posts: 1,087	Re: Different prop valve power vs. non-power brakes? Whatever you go with, be sure to use the original drum brake prop valve until you make the upgrade to discs up front. __________________ Brent '72 Chevy SWB stepside - [ Build Thread ] '79 ChevMC SWB fleetside - [ Build Thread ] '64 Chevy SWB fleetside & '66 Chevy SWB stepside (waiting in the wings...) Last edited by brossow; 10-05-2008 at 07:31 PM.

10-05-2008, 03:53 PM	#8
ED67C20 Registered User Join Date: Aug 2006 Location: spokane, washington Posts: 37	Re: Different prop valve power vs. non-power brakes? Thanks brossow, I thought they were different from looking at the NAPA auto parts website. Just wanted to be sure since it is brakes like you said. I know C10 is diffenent found a lot of those in the past. I found disc setup on a 77 C20 but I think the tie rod ends are bigger. What do you think? Last edited by ED67C20; 10-05-2008 at 04:48 PM. Reason: spelling

10-05-2008, 07:18 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Different prop valve power vs. non-power brakes? The boosters aren't the same.



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