How do you check the brake booster? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 02-17-2005, 11:02 PM

This is not on my 68 chevy but on my 182 ton 01 sierra. How would you check to see if the booster is working ok? I just did a brake job but it feels like there is no booster there at all. Was the same way before the brake job to.
Thanks

sneakysnake · 02-18-2005, 12:11 AM

All the ones that I have ever had to go bad make a hissing or sucking sound,you might check your vac line from the manifold to the booster for cracks and leaks.

skokie · 02-18-2005, 12:18 AM

Its not hissing and also it is not hard either. Forgot to mention that. Could it be the master cylinder? What are the symptoms of a master cylinder going out?

Solver · 02-18-2005, 01:26 AM

I always just pull the booster vacuum line and if the truck stays running then it is probably bad

avejoe · 02-18-2005, 02:47 AM

To check the booster....

With key off, pump the pedal a couple of times and it should firm up. Hold your foot on the pedal and start the truck. The pedal should fall about .5 inch.

If the booster does this then it should be ok for its designed assist. Mine checked out but would not stop the truck. I ended up buying a dual diaphram booster.

sneakysnake · 02-18-2005, 10:45 AM

Quote:

Originally Posted by skokie

Could it be the master cylinder? What are the symptoms of a master cylinder going out?

usually leaking or wont make a pedal.You might try unhooking the vac line and check to see you have good vac,try your pedal with and without the vac line hooked up see any difference.

02-17-2005, 11:02 PM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	How do you check the brake booster? This is not on my 68 chevy but on my 182 ton 01 sierra. How would you check to see if the booster is working ok? I just did a brake job but it feels like there is no booster there at all. Was the same way before the brake job to. Thanks __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

02-18-2005, 12:18 AM	#3
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,354	Its not hissing and also it is not hard either. Forgot to mention that. Could it be the master cylinder? What are the symptoms of a master cylinder going out? __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

02-18-2005, 01:26 AM	#4
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	I always just pull the booster vacuum line and if the truck stays running then it is probably bad __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

02-18-2005, 02:47 AM	#5
avejoe Custer had a plan too. Join Date: Dec 2003 Location: No. California Posts: 344	To check the booster.... With key off, pump the pedal a couple of times and it should firm up. Hold your foot on the pedal and start the truck. The pedal should fall about .5 inch. If the booster does this then it should be ok for its designed assist. Mine checked out but would not stop the truck. I ended up buying a dual diaphram booster. __________________ 72 K15 GMC (aka Big White) Performance Rockers, Cab Corners, and Floors Fossil Fuel Glutton Neighborhood Nuisance 98 BMW 540i for Speed (Sold ) 05 Subaru Outback for mileage

02-18-2005, 12:11 AM	#2
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	All the ones that I have ever had to go bad make a hissing or sucking sound,you might check your vac line from the manifold to the booster for cracks and leaks.



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