Brake booster problem! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

big blue 72 · 03-20-2006, 11:05 AM

bought a brake booster from someone on the board and am having a problem with it.
the pushrod isnt long enough to bring the brake pedal back up to original position, so when it is hooked up the brake lights stay on.
i looked at the brake light switch and it wont adjust out long enough to raise it up . and it is welded on so i dont think it can be moved. what do i need to fix this?

big blue 72 · 03-20-2006, 12:01 PM

also, the brown/tan wire i removed from the prop valve. Does that need to be hooked back up somewhere?

farside847 · 03-20-2006, 12:03 PM

This is actually normal. You will need to adjust the brake light switch to only turn on when the pedel is pressed.

farside847 · 03-20-2006, 12:03 PM

more info:

http://67-72chevytrucks.com/vboard/s...d.php?t=163387

big blue 72 · 03-20-2006, 12:29 PM

Yup, reading the FAQ was how i got it in.
How do you adjust the switch position?
Brown wire?

farside847 · 03-20-2006, 01:15 PM

Mine was adjustable. The switch at the pedal could be screwed in and out.

big blue 72 · 03-20-2006, 01:29 PM

thanks i will try that.

Sweet72 · 03-20-2006, 01:35 PM

Brown wire is for your brake warning light and should go to the proportioning valve. If you didn't change out the prop valve to one without the switch it should just plug right in. I believe the brake pedal sits quite a bit lower with power brakes than manual if I remember correctly. This is normal.

03-20-2006, 11:05 AM	#1
big blue 72 Senior Member Join Date: May 2002 Location: hamilton,ohio,usa Posts: 1,499	Brake booster problem! bought a brake booster from someone on the board and am having a problem with it. the pushrod isnt long enough to bring the brake pedal back up to original position, so when it is hooked up the brake lights stay on. i looked at the brake light switch and it wont adjust out long enough to raise it up . and it is welded on so i dont think it can be moved. what do i need to fix this?

03-20-2006, 12:01 PM	#2
big blue 72 Senior Member Join Date: May 2002 Location: hamilton,ohio,usa Posts: 1,499	Re: Brake booster problem! also, the brown/tan wire i removed from the prop valve. Does that need to be hooked back up somewhere?

03-20-2006, 12:03 PM	#3
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 995	Re: Brake booster problem! This is actually normal. You will need to adjust the brake light switch to only turn on when the pedel is pressed. __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

03-20-2006, 12:03 PM	#4
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 995	Re: Brake booster problem! more info: http://67-72chevytrucks.com/vboard/s...d.php?t=163387 __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

03-20-2006, 12:29 PM	#5
big blue 72 Senior Member Join Date: May 2002 Location: hamilton,ohio,usa Posts: 1,499	Re: Brake booster problem! Yup, reading the FAQ was how i got it in. How do you adjust the switch position? Brown wire?

03-20-2006, 01:15 PM	#6
farside847 Registered User Join Date: Feb 2005 Location: Bay Area, California Posts: 995	Re: Brake booster problem! Mine was adjustable. The switch at the pedal could be screwed in and out. __________________ 1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree

03-20-2006, 01:29 PM	#7
big blue 72 Senior Member Join Date: May 2002 Location: hamilton,ohio,usa Posts: 1,499	Re: Brake booster problem! thanks i will try that.

03-20-2006, 01:35 PM	#8
Sweet72 Registered User Join Date: Nov 2003 Location: Alexandria, VA Posts: 1,534	Re: Brake booster problem! Brown wire is for your brake warning light and should go to the proportioning valve. If you didn't change out the prop valve to one without the switch it should just plug right in. I believe the brake pedal sits quite a bit lower with power brakes than manual if I remember correctly. This is normal. __________________ '72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.



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