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Home >> Mercedes Benz >> 2003 >> G55 >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Disc Brakes - 463 Chassis >> Testing >> Testing For Leaks Using Pressure Gauge >> Low-Pressure Test

Low-Pressure Test

NOTE: Perform high-pressure test before performing low-pressure test, see HIGH-PRESSURE TEST  .
  1. Turn off engine and pump brake pedal until vacuum is reduced.
  2. Turn back brake pedal locking device until a line pressure of approximately 44 psi (3 bar) overpressure is still indicated on pressure gauge. Observe pressure gauge for 2 minutes, the line pressure must not fall throughout duration of test.
  3. Disconnect pressure tester.
  4. If brake system passes pressure test, bleed brake system at caliper that was opened during testing. See BLEEDING BRAKE SYSTEM  . If brake system does not pass pressure test, check complete system for fluid leaks.
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