Cherokee 2WD L4-150 2.5L VIN P MFI (1991)
Technical Service Bulletin # 055291
Date: 911118
ABS Actuator - Service Procedure
NO.: 05-52-91
GROUP:
BRAKES
DATE:
Nov. 18, 1991
SUBJECT:
Actuator Service Procedure Bendix ABS Brakes - 1991 XJ
NOTE:
THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH BENDIX ABS ONLY.
MODELS:
1991 (XJ) CHEROKEE
DISCUSSION:
When using the diagnostic procedure manual and a modulator fault is detected, replacement of the modulator assembly is no longer necessary when the
actuator is the failed part. The actuator and reservoir assembly can now be serviced.
PARTS REQUIRED:
1
Actuator and Reservoir Assembly
4637621
Actuator and Reservoir Assembly Components:
1
Actuator Assembly
1
Brake Fluid Reservoir
3
Grommet - Reservoir to Actuator
1
Dust Boot
1
Fluid Level Switch
Repair Procedure:
This repair involves the replacement of the actuator and reservoir assemblies.
WARNING:
THE NORMAL WORKING PRESSURE OF THE ANTI-LOCK BOOST SYSTEM IS 1650-2050 PSI. SYSTEM PRESSURE
MUST BE PUMPED DOWN BEFORE ANY PRESSURE LINES ARE LOOSENED/DISCONNECTED. FAILURE TO DO SO
COULD RESULT IN PERSONAL INJURY.
TO REDUCE SYSTEM PRESSURE:
1.
TURN IGNITION SWITCH OFF.
2.
APPLY BRAKES 45-50 TIMES (UNTIL PEDAL IS FIRM).
THE ACCUMULATOR TANK AND SMALL ACCUMULATOR ON THE BOOSTER PUMP CONTAIN HIGH PRESSURE GAS CHARGES. DO
NOT PUNCTURE OR ATTEMPT TO DISASSEMBLE EITHER OF THESE COMPONENTS AT ANY TIME. WEAR SAFETY GOGGLES WHEN
DISCONNECTING FLUID LINES. KEEP WORK AREA CLEAN. AVOID CONTAMINATION OF SYSTEM COMPONENTS WITH DIRT OR
FOREIGN MATERIAL. USE ONLY NEW MOPAR BRAKE FLUID OR EQUIVALENT MEETING SAE J1703 AND DOT 3 STANDARDS.
PREVENT BRAKE FLUID FROM CONTACTING PAINTED SURFACES. IF CONTACT OCCURS, FLUSH THOROUGHLY WITH WATER.
Remove the Hydraulic Unit:
1.
Pump the brake system pressure down by turning the ignition key OFF and applying the brake pedal until the pedal becomes firm,
approximately 45-50 times.