Sonata GLS V6-2.7L (2002)
Vacuum Brake Booster: Testing and Inspection
BRAKE BOOSTER OPERATION TEST WITHOUT A TESTER
For a simple check of brake booster operation, perform the following tests.
1. Run the engine for one or two minutes, and then shut it off. Depress the brake pedal several times at normal foot pressure. If the pedal goes down
further the first time, but gradually rises after the second or third time, the brake booster is functioning property. Go to step 2.
2. With the engine stopped, depress the brake pedal several times. Depress the brake pedal and start the engine. If the pedal goes down slightly, the
booster is in good condition. Go to step 3.
3. With the engine running, depress the brake pedal and then stop the engine. Hold the pedal depressed for 30 seconds. If the pedal height does not
change, the booster is in good condition.
If the of the above three tests is not okay, check the vacuum hoses, and the brake booster, and make any necessary corrections. If all tests OK, unit
is good.
