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International Automotive Technicians Network
Re: Power brake booster operation and trouble shooting
Posted to Technical Discussion Forum on 1/16/2020

If you dump the vacuum and the brakes free up the master cyl is ok. The application of the booster is controlled at the pedal end of the booster. Go to 2:25 in your video. If the master was the problem removing vacuum would not change the locked brakes. IF you... Login to read more.