Santa Fe L4-2.4L (2001)
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
completely the first time, but rises gradually, the brake booster is functioning properly. If the height of the pedal doesn't change, the booster may
be damaged.
2. After checking that the height of the pedal changes when depressing the brake pedal several times with the engine stopped, start it keeping the
brake pedal depressed. At this time, if it goes down slightly, the booster is good but if the height of it doesn't change, it is damaged.
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 pedal rises up, it is damaged.
4. If one of the above three tests is not OK, check the vacuum hoses, the check valve and the brake booster. Make any necessary corrections. If all
tests are OK, the unit is in good condition.