Adjusting Proportioning Valve - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NPilot1975 · 03-17-2007, 04:16 PM

I am trying to trouble shoot a problem with my rear brakes. I am looking for the thread on how to adjust the proportioning vavle.

cdowns · 03-17-2007, 05:11 PM

there is no adjustment on the combination valve

**LockDoc** · 03-17-2007, 09:49 PM

-
See if this thread helps at all.

http://67-72chevytrucks.com/vboard/s...rtioning+valve

LockDoc

71Chev · 03-18-2007, 04:42 AM

There is a button under the black cap on one end of your prop valve. Use a clamp to depress & hold. Slowly push brake pedal to the floor or as close as you can get the pedal to the floor pushing firmly onthe pedal, and release. Remove clamp from prop. valve. It should be centered again.
GM sold a special tool for depressing the button. I just use a squeeze clamp.

LMN8UR · 04-22-2007, 03:49 PM

71Chev, Thank You. . . I was about to go spend 80 bucks for a replacement. I had checked my brakes top to bottom but couldn't get the light to clear. I looked in the Haynes manual -Pffffffff, what a waste! I tried your trick with a 6" C-Clamp. IT WORKED. Thank You, Thank You!

03-17-2007, 04:16 PM	#1
NPilot1975 Senior Member Join Date: Aug 2002 Location: Plymouth, MA Posts: 891	Adjusting Proportioning Valve I am trying to trouble shoot a problem with my rear brakes. I am looking for the thread on how to adjust the proportioning vavle. __________________ 1972 Blazer body...need to get a thread started for the rest of the story

03-17-2007, 05:11 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Adjusting Proportioning Valve there is no adjustment on the combination valve __________________ 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

03-17-2007, 09:49 PM	#3
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,774	Re: Adjusting Proportioning Valve - See if this thread helps at all. http://67-72chevytrucks.com/vboard/s...rtioning+valve LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - Last edited by LockDoc; 03-18-2007 at 10:45 AM. Reason: Might help if I included the link????

03-18-2007, 04:42 AM	#4
71Chev Senior Member Join Date: Dec 2000 Location: Indiana Posts: 3,074	Re: Adjusting Proportioning Valve There is a button under the black cap on one end of your prop valve. Use a clamp to depress & hold. Slowly push brake pedal to the floor or as close as you can get the pedal to the floor pushing firmly onthe pedal, and release. Remove clamp from prop. valve. It should be centered again. GM sold a special tool for depressing the button. I just use a squeeze clamp. __________________ 71 Chevy CST Long Fleet 350/350/3.07 leaf rear.

04-22-2007, 03:49 PM	#5
LMN8UR Registered User Join Date: Jun 2005 Location: Midlothian, VA Posts: 148	Re: Adjusting Proportioning Valve 71Chev, Thank You. . . I was about to go spend 80 bucks for a replacement. I had checked my brakes top to bottom but couldn't get the light to clear. I looked in the Haynes manual -Pffffffff, what a waste! I tried your trick with a 6" C-Clamp. IT WORKED. Thank You, Thank You! __________________ 72 Chevy C-10 Custom LWB 383 Stroker - Edlebrock Air Gap intake and 670 CFM Holley Street Avenger carb. Hooker Comp Headers w/ X-Pipe and 2.25 duals TKO-500 & 3.08:1 rear I Love HEMI's, they're soft & chewy!

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