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Home >> Jeep >> 1993 >> Cherokee Base, 4D Utility, 2.5 P, 4WD >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Test 4A >> Hydraulic Failure

Hydraulic Failure

  1. Inspect brake system for hydraulic leaks, and repair as necessary. If brake system is okay, using DRB-II, read fault messages. If DRB-II displays PUMP/MOTOR NOT WORKING PROPERLY, perform TEST 15A. If DRB-II displays PEDAL TRAVEL SENSOR CIRCUIT, perform TEST 14A. If DRB-II does not display PUMP/MOTOR NOT WORKING PROPERLY or PEDAL TRAVEL SENSOR CIRCUIT, using DRB-II, erase fault messages.
  2. Using DRB-II, monitor read faults display for 4 minutes. If any fault messages are displayed, perform TEST 1A. If no fault messages are displayed, depress brake pedal and hold down until instructed to release it. Using DRB-II, actuate hydraulic valve test. Release brake pedal.
  3. If brake pedal came back up, perform TEST 14A. If brake pedal dropped all the way to the floor or there were not 3 slight drops in the brake pedal, perform TEST 4B. If the brake pedal did not come back up at end of test, replace pump/motor assembly. If the brake pedal did come back up at end of test, replace CAB. If CAB has already been replaced, replace HCU. Perform VERIFICATION TEST VER-1A.
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