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

chewed 71'er · 01-23-2003, 03:03 PM

What tool, either GM or aftermarket, is used to 'hold' the proportioning valve open while bleeding the brakes? I've never seen one, let alone how to use it. I don't know if this is a critical step or not. Thanks.

jhow66 · 01-23-2003, 04:32 PM

If it pushs in ,take a piece of duct tape and tape it open--must be done to bleed brakes.

casey · 01-24-2003, 02:16 AM

I'm no expert, but I've never touched the proportioning when I've bleeding brakes, Just bleed them. I did here of a cool do it yourself bleeding valve, seen it on two guys garage. It's a valve you put in place of you bleeder screw, it has a little ball and spring in it, just turn it open, and go pump the pedal, every time you back off on pedal pressure the ball seats so no air goes back in. When your done just tighten it up wala

spinning wheels · 01-25-2003, 05:18 AM

I have never touched the proportioning valve, when bleeding brakes. I have installed Speed bleeders on all my brakes. You crack them open 1/4 to 1/2 turn, pump the brakes then close them back up. The built in check valve keeps air from getting back in. You may want to run a hose from the bleeder to a catch can. A set of 4 cost around $30 bucks.

01-23-2003, 03:03 PM	#1
chewed 71'er Registered User Join Date: Mar 2002 Location: KC, NW Missouri Posts: 144	Bleeding brake system with proportioning valve What tool, either GM or aftermarket, is used to 'hold' the proportioning valve open while bleeding the brakes? I've never seen one, let alone how to use it. I don't know if this is a critical step or not. Thanks.

01-23-2003, 04:32 PM	#2
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	If it pushs in ,take a piece of duct tape and tape it open--must be done to bleed brakes. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

01-25-2003, 05:18 AM	#4
spinning wheels Registered User Join Date: Sep 2001 Location: Hacienda Heights, California USA Posts: 474	I have never touched the proportioning valve, when bleeding brakes. I have installed Speed bleeders on all my brakes. You crack them open 1/4 to 1/2 turn, pump the brakes then close them back up. The built in check valve keeps air from getting back in. You may want to run a hose from the bleeder to a catch can. A set of 4 cost around $30 bucks. __________________ '72 GMC custom camper 350/350

01-24-2003, 02:16 AM	#3
casey Registered User Join Date: Jan 2003 Location: Kelowna B.C. Canada Posts: 2,048	I'm no expert, but I've never touched the proportioning when I've bleeding brakes, Just bleed them. I did here of a cool do it yourself bleeding valve, seen it on two guys garage. It's a valve you put in place of you bleeder screw, it has a little ball and spring in it, just turn it open, and go pump the pedal, every time you back off on pedal pressure the ball seats so no air goes back in. When your done just tighten it up wala



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