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Friday, 2 October 2015

How to Troubleshoot a Brake Vacuum Booster

How to Troubleshoot a Brake Vacuum Booster

The brake booster is a power braking system provided by a vacuum and hose mechanism attached to the system. This should, in theory, assist braking; however, if it is not working properly then you may find it actually makes pressing on the brake pedal to slow or stop the car much more difficult. Naturally, it is absolutely vital to remedy this potentially dangerous issue. There are steps you can take to diagnose and fix the problems.

Pump the brake several times and hold the pedal down while attempting to start the engine. If the power brake is working, it will pull the pedal down further. If the pedal does not move, you have a problem. This confirms that you need to carry out a basic troubleshooting process.

Start the engine and check for vacuum in the hose. The engine should smooth out if you plug the hose end. If you don't feel the vacuum suction, the problem is a restricted vacuum port and this must be cleaned.

Attach the valve and hose to the brake booster and listen for any air leakage. This indicates a cracked booster, which you must have replaced for the mechanism to work properly.

Replace the booster if the brake still has no power assist and you have exhausted the previous steps.

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