High Pressure Test
- Raise and support vehicle. Remove front left wheel. Remove brake caliper bleed screw and connect pressure tester (051). See Fig 1
.
- Bleed pressure tester according to tool manufacturers instructions.
- Run engine at moderate speed, create as great a vacuum as possible by releasing accelerator pedal.
- Insert brake pedal locking device (080) together with adapter between brake pedal and seat.
- Depress brake pedal as far as possible with brake pedal locking device. Pressure loss during test duration of 5 minutes must not exceed 5 percent of regulated value. If high pressure test is OK, continue with low pressure testing. See LOW PRESSURE TEST
. If high pressure test is not OK, check for brake fluid loss. See BRAKE FLUID LOSS
.
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.