power booster
Thread Starter
4th Gear Member
Joined: Aug 2004
Posts: 1,115
From: Los Angeles, CA
power booster
is there away to check if my power boost on the master cylinder is going bad? i think it is, because my brake pedal is nice and stiff sometimes and sometimes it goes all the way to the floor, but im not losing any break fluid and i bled the lines recently, im thinking the boost is going bad even though its only about 2 yrs old [&o]
3rd Gear Member
Joined: Jul 2007
Posts: 877
From:
RE: power booster
easiest way to check it is to attach a vacuum pump with gage to the booster and pump it up and let it sit. If the pressure goes down than you have a leak somewhere. Also it my not be the booster but rather the MC some times the seals in side will leak under pressure causing fluid to by pas the brake system and return to the MC. Often times when this happens the MC will leak but not always. Check the booster first if it holds vacuum than replace the MC.
4th Gear Member
Joined: Jun 2006
Posts: 1,483
From: Fontana, California
RE: power booster
Ifa booster is bad the force to push it will increase substantially and in some cases causes the engine to misfire due to a large vacumn leak. If you can randomly push the pedal to the floor is typically an indication that the master is bypassing and needs to be replaced or there is still air in your system. Look at the condition of your rubber brake lines for cracking as this is a source of air in the system that is usually overlooked.
4th Gear Member
Joined: Jun 2006
Posts: 1,483
From: Fontana, California
RE: power booster
ORIGINAL: DazeCars
easiest way to check it is to attach a vacuum pump with gage to the booster and pump it up and let it sit. If the pressure goes down than you have a leak somewhere. Also it my not be the booster but rather the MC some times the seals in side will leak under pressure causing fluid to by pas the brake system and return to the MC. Often times when this happens the MC will leak but not always. Check the booster first if it holds vacuum than replace the MC.
easiest way to check it is to attach a vacuum pump with gage to the booster and pump it up and let it sit. If the pressure goes down than you have a leak somewhere. Also it my not be the booster but rather the MC some times the seals in side will leak under pressure causing fluid to by pas the brake system and return to the MC. Often times when this happens the MC will leak but not always. Check the booster first if it holds vacuum than replace the MC.
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