Can a brake booster be tested without starting the vehicle? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bcj67chevy · 05-02-2010, 08:39 PM

Can a brake booster be tested without starting the vehicle?
I have a hand vaccum pump tester thing and i attached it to the booster and pumped it up to 20 and stopped, the booster held the vaccum for 30 min without leaking before i unhooked it.
Is there anything else that can go wrong with a booster except for leaking to make it bad?

Thanks

69halfton · 05-02-2010, 08:49 PM

is the booster on a truck right now thats not running? or you just have the booster sitting on your work bench at home?

usually if it holds vacuum it should be good, I'm no expert but i know there isn't much too them, just a diaphram and a one way check valve on the vacuum port, and the steel piece that the push-rod that moves the pistons in the master cyl....

bcj67chevy · 05-02-2010, 09:34 PM

still mounted on truck.

hayhauler71 · 05-02-2010, 09:40 PM

If it holds vacuum its good

Leviticus · 05-02-2010, 09:59 PM

Get a big Slurpy straw and stick it in the hole and suck away, it it holds pressure its good

Just kidding, if you have a vacuum tester and can hook it to the port somehow, and it holds the vacuum it should be fine.

05-02-2010, 08:39 PM	#1
bcj67chevy 402 BIG BLOCK Join Date: Mar 2006 Location: McClelland IA Posts: 286	Can a brake booster be tested without starting the vehicle? Can a brake booster be tested without starting the vehicle? I have a hand vaccum pump tester thing and i attached it to the booster and pumped it up to 20 and stopped, the booster held the vaccum for 30 min without leaking before i unhooked it. Is there anything else that can go wrong with a booster except for leaking to make it bad? Thanks __________________ 1967 C10 swb 1970 GMC Jimmy 4x4 2005 Chevy tahoe Z71 2001 Chevy impala

05-02-2010, 08:49 PM	#2
69halfton Registered User Join Date: Apr 2007 Location: King City, Ontario, Canada Posts: 974	Re: Can a brake booster be tested without starting the vehicle? is the booster on a truck right now thats not running? or you just have the booster sitting on your work bench at home? usually if it holds vacuum it should be good, I'm no expert but i know there isn't much too them, just a diaphram and a one way check valve on the vacuum port, and the steel piece that the push-rod that moves the pistons in the master cyl.... __________________ - Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men.

05-02-2010, 09:34 PM	#3
bcj67chevy 402 BIG BLOCK Join Date: Mar 2006 Location: McClelland IA Posts: 286	Re: Can a brake booster be tested without starting the vehicle? still mounted on truck. __________________ 1967 C10 swb 1970 GMC Jimmy 4x4 2005 Chevy tahoe Z71 2001 Chevy impala

05-02-2010, 09:40 PM	#4
hayhauler71 Registered User Join Date: Aug 2009 Location: St. Paul MN. Posts: 1,996	Re: Can a brake booster be tested without starting the vehicle? If it holds vacuum its good

05-02-2010, 09:59 PM	#5
Leviticus Shake and Bake! Join Date: Feb 2010 Location: Central Coast, CA Posts: 609	Re: Can a brake booster be tested without starting the vehicle? Get a big Slurpy straw and stick it in the hole and suck away, it it holds pressure its good Just kidding, if you have a vacuum tester and can hook it to the port somehow, and it holds the vacuum it should be fine. __________________ "All tyranny needs to gain a foothold is for people of good conscience to remain silent." Thomas Jefferson "You are remembered for the rules you break." General Douglas MacArthur "Support Our Troops And The NRA"



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