Optima V6-2.7L VIN 8 (2006)
Vacuum Brake Booster: Service and Repair
BRAKE BOOSTER
COMPONENTS
BRAKE BOOSTER OPERATION TEST
TEST WITHOUT A TESTER
For a simple check of brake booster operation, make the following tests.
1. Run the engine for one or two minutes, and then stop it. Depress the brake pedal several times at normal foot pressure. If the pedal goes down
deepest the first time, but gradually rises after the second or third time, the brake booster is functioning properly. 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.
