High-Pressure Test
- Raise and support vehicle. Remove wheels.
- Remove bleed screw at brake caliper and connect pressure tester. See Fig 1
.
- Bleed pressure tester according to tool manufacturers instructions.
- Start vehicle and run at moderate engine speed, create as great a vacuum as possible by suddenly releasing accelerator pedal.
- Insert brake pedal locking device (080) together with adapter between brake pedal and seat.
- Press brake pedal as far as possible with brake pedal winch. Pressure loss must not exceed 5 percent of regulated value for a duration of 5 minutes.
- If high-pressure test is OK, continue with low-pressure test, 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.