new brake booster problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pissonNOS · 04-09-2003, 11:17 PM

installed my brake booster and now my park lights stay on till i "jiggle" the brake pedal with my hand its gotta be some kind of adjustment but im not sure any one help me?

Brad · 04-09-2003, 11:33 PM

Do you mean parking lights or brake lights. If brake lights stay on, you just need to adjust the switch under the pedal. The problem with these conversions is that the pedal is farther down and thus, makes contact with the switch. I had this problem when I did the swap. Sorry if I anwered something other than what you were asking.

Scrub · 04-09-2003, 11:37 PM

It's pretty Simple. Look up under the dash at the brake pedal and you will see a white plastic switch with an adjusting nut. Just back it off a bit. More than likely you booster isn't letting the pedal back quite as much as without. Which also leads me to think about your linkage adjustment. You might need to adjust the plunger rod on the master cylinder, as the brakes might not be comming all the way back.

Good luck

pissonNOS · 04-09-2003, 11:38 PM

well heres the thing my mechanic who happens to be my boss helped me do it. when he was under the dash he noticed a yellow wire had been fused into the switch for the brake pedal he asked me what if was for and the wire leads to my deck and says back up on it
so from what we can figure it has something to do with that and ya its the brake lights and park lights
we even adjusted like u said and it works for a while but not too long
maybe needs to be adjusted more

pissonNOS · 04-09-2003, 11:41 PM

damn u guys reply faster than i can type haha

ya when i got the booster it didnt come with the plunger rod so when i went back to get it someone had already come and got it so he grabbed me one out of a 73-87 truck couldnt tel what yr only a firewall sitting there and im thinkin maybe its too small or short?

04-09-2003, 11:17 PM	#1
pissonNOS senior member Join Date: Feb 2003 Location: fort macleod alberta Posts: 2,770	new brake booster problems installed my brake booster and now my park lights stay on till i "jiggle" the brake pedal with my hand its gotta be some kind of adjustment but im not sure any one help me? __________________ 69 GMC bagged

04-09-2003, 11:33 PM	#2
Brad Out of the carpool lane. Join Date: Jan 2000 Location: Clark Co, WA Posts: 5,673	Do you mean parking lights or brake lights. If brake lights stay on, you just need to adjust the switch under the pedal. The problem with these conversions is that the pedal is farther down and thus, makes contact with the switch. I had this problem when I did the swap. Sorry if I anwered something other than what you were asking. __________________ 1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten...

04-09-2003, 11:37 PM	#3
Scrub Collector of rusty Items Join Date: Dec 2001 Location: Sisters,Oregon USA Posts: 731	It's pretty Simple. Look up under the dash at the brake pedal and you will see a white plastic switch with an adjusting nut. Just back it off a bit. More than likely you booster isn't letting the pedal back quite as much as without. Which also leads me to think about your linkage adjustment. You might need to adjust the plunger rod on the master cylinder, as the brakes might not be comming all the way back. Good luck __________________ Scrub Sisters, Oregon - Home of the Sisters Rodeo. 70 GMC 1,000,000 + miles 72 K-20 project, 456 Dana60 front, Corp14 rear w/locker, 265R19.5 tires 20-ply. Warn 12k winches both ends, Cross-over steering with raised tie-rod, Powerbox steering, 4500 watt 120-AC power, Air, Hydraulic aux power, 4 inch lift, 5000 lb air-bags both ends.

04-09-2003, 11:38 PM	#4
pissonNOS senior member Join Date: Feb 2003 Location: fort macleod alberta Posts: 2,770	well heres the thing my mechanic who happens to be my boss helped me do it. when he was under the dash he noticed a yellow wire had been fused into the switch for the brake pedal he asked me what if was for and the wire leads to my deck and says back up on it so from what we can figure it has something to do with that and ya its the brake lights and park lights we even adjusted like u said and it works for a while but not too long maybe needs to be adjusted more __________________ 69 GMC bagged

04-09-2003, 11:41 PM	#5
pissonNOS senior member Join Date: Feb 2003 Location: fort macleod alberta Posts: 2,770	damn u guys reply faster than i can type haha ya when i got the booster it didnt come with the plunger rod so when i went back to get it someone had already come and got it so he grabbed me one out of a 73-87 truck couldnt tel what yr only a firewall sitting there and im thinkin maybe its too small or short? __________________ 69 GMC bagged



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