Question about 2005 Toyota Corolla
Seal between brake booster & master cylinder failed. Brake booster was replaced. Noise stopped but then brake fluid filled booster & brakes failed. Was the wrong part replaced.
It's the master cylinder that needed replacing. Check if the booster will still be good after draining it.
Posted on Mar 03, 2013
To bleed the brake system open all the bleeders and let the system gravity bleed for @ 1/2 hour ensuring the master stays full. Then close all bleeders and starting furthest from the master (r/r) have someone pump the brakes 2-3 times,hold the pedal down, then open the bleeder,close the bleeder,and repeat untill there are no air bubbles and the brake fluid is running clear .Repeat for all wheels in this order R/R L/R R/F L/F ensuring master cykinder does not run empty. You cannot pump the pedal with a bleeder open you will be sucking air back into the system. Once you finish all wheels repeat to ensure there is no air remaining in system.
Posted on Apr 17, 2009
It would be extraordinary for a technician to recommend a booster and a master cylinder with no previous mention from you of a possible problem in this area. In other words, the technician had no business looking at the m/cyl or the booster, unless you told him that your braking was deficient.
Here is what REALLY happened: Somewhere, I'd bet, your brake light came on, and somebody "topped off" the master cylinder, to shut the light off. Now, please understand that the brake fluid level in the master cylinder reservoir DROPS PROPORTIONALLY to the wear of the brake pads. When the tech replaced the front brake pads, he obviously had to squeeze the caliper pistons into the housings to allow the insertion of the new pads. This action forced the brake fluid from the now-compressed caliper pistons BACK into the master cylinder, and it sprayed out from under the cap, coating the cylinder and the booster. Tell that repair service that you do NOT need a booster and a master cylinder, THEY caused the problem with the fluid being everywhere. I am confident that I just saved you a significent amount of money that you do NOT need to spend. Have a great day.
Posted on Dec 29, 2008
The fluid level will drop when the brake pads and or shoes wear thinner. A good way to check for a hydraulic fluid leak is Shut engine off step down on the brake pedal and hold it for 3 minutes. The pedal should not slowly drop. It will go down and hold.
Posted on Feb 28, 2009
most likely your master cylinder is acting up try to press hard on your break for a period of time and see if the pedal will sink/replace master
Posted on Jan 13, 2010
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