power brake t/s - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevyhouse · 04-24-2002, 10:48 PM

i just installed a disc and power brake conversion on my 69' and we are having trouble with the booster we think. with the engine off, the pedal is firm and returns like normal, with the engine running (17-20in vacumm) press the pedal and it stays down, has to be pulled up. the entire system has been bleed and checked, the disc brakes worked fine before we did the power booster. any ideas, i need to get this truck back on the road soon. thanks

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Kurt
94' Camaro
85'Plymouth Horizon
69' C10, 350/4spd, lwb, fleetside long box, 3.5"/5" drop, power and disc conversion
early 80's Schwinn 18 spd

tripower · 04-24-2002, 10:58 PM

sounds like a bad booster there is a valve inside that releases the vacuum seal when you let off the pedal.
http://www.howstuffworks.com/power-brake1.htm

tripower · 04-24-2002, 11:02 PM

better page
http://www.howstuffworks.com/power-brake2.htm

Longhorn Man · 04-24-2002, 11:20 PM

my longhorn was doing that...new booster (old one off the old longhorn) and it works now.

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'69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man
I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it.
FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite.
If you need a pic posted, E-mail me at longhornmail@yahoo.com
Andy, in Columbus Ohio

04-24-2002, 10:48 PM	#1
chevyhouse BEER-Vacation in a can... Join Date: Jun 2001 Location: wichita, ks Posts: 444	power brake t/s i just installed a disc and power brake conversion on my 69' and we are having trouble with the booster we think. with the engine off, the pedal is firm and returns like normal, with the engine running (17-20in vacumm) press the pedal and it stays down, has to be pulled up. the entire system has been bleed and checked, the disc brakes worked fine before we did the power booster. any ideas, i need to get this truck back on the road soon. thanks ------------------ Kurt 94' Camaro 85'Plymouth Horizon 69' C10, 350/4spd, lwb, fleetside long box, 3.5"/5" drop, power and disc conversion early 80's Schwinn 18 spd __________________ Kurt 03' Trailblazer 69' C10 "SPSHL-K", 388 stroker/BTO 700R4, 2400 stall, 3.73 posi, lwb, fleetside long box, 3.5"/5" drop, 18" Budnik 2000 Yamaha V-Star 1100 Custom For Sale-87' V10-4x4, 408/700r4, 4.10's PM for pics

04-24-2002, 10:58 PM	#2
tripower Registered User Join Date: Apr 2002 Location: Tampa,FL,USA Posts: 16	sounds like a bad booster there is a valve inside that releases the vacuum seal when you let off the pedal. http://www.howstuffworks.com/power-brake1.htm

04-24-2002, 11:02 PM	#3
tripower Registered User Join Date: Apr 2002 Location: Tampa,FL,USA Posts: 16	better page http://www.howstuffworks.com/power-brake2.htm

04-24-2002, 11:20 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	my longhorn was doing that...new booster (old one off the old longhorn) and it works now. ------------------ '69 G.M.C. 350/350. Trying to clean up the left over damage from the Dope-Smokin-Old-Man I've been dubbed the Longhorn Freak/Fanatic/Expert, I just hope I can live up to it. FINALLY got the HORNIAC...a '70 one ton Longhorn with a Pontiac 350/350 and lots of 'personality'. Check out The Longhorn Webite. If you need a pic posted, E-mail me at longhornmail@yahoo.com Andy, in Columbus Ohio



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