How to Test a Brake Booster with a Vacuum Pump: Step-by-Step Guide
To test a brake booster with a vacuum pump, first remove the vacuum hose from the booster and connect the vacuum pump to the hose. Start the engine and let it idle, then gradually apply pressure to the brake pedal while monitoring the vacuum gauge on the pump. The vacuum should increase as the pedal is pressed and decrease when it is released. If the vacuum does not change or is lower than expected, the booster may be faulty and should be replaced.