PARKING BRAKE PEDAL EFFORT LOW (READJUST CABLE ASSEMBLY). Chevrolet Chevy P RV/Van/Commercial Chassis 1995

SUBJECT: PARKING BRAKE PEDAL EFFORT LOW (READJUST CABLE ASSEMBLY)

MODELS: 1994 - 96 CHEVROLET AND GMC TRUCK P300(32) WITH ELECTRIC/HYDRAULIC AUTO APPLY PARKING BRAKE SYSTEM (RPO J71) 16,000 POUND GVWR OR ABOVE

CONDITION:

CUSTOMERS MAY COMMENT THAT PARKING BRAKE PEDAL APPLY EFFORTS APPEAR TO BE TOO LOW.

CAUSE:

PARK BRAKE AUTO APPLY AND FOOT PEDAL CABLE OUT OF ADJUSTMENT.

IMPORTANT: WITH THE AUTO APPLY SYSTEM IN THE PARK POSITION, FOOT PEDAL APPLY LOADS WILL BE VERY LOW OR ABSENT. THIS CONDITION IS NORMAL. CHECK FOR PROPER FOOT PEDAL ADJUSTMENT WITH SHIFT LEVER IN THE NEUTRAL POSITION.

CORRECTION:

ADJUST AUTOMATIC APPLY PARK BRAKE AND PARK BRAKE FOOT APPLY CABLE SYSTEM FOLLOWING SERVICE PROCEDURE BELOW.

SERVICE PROCEDURE

1. RAISE VEHICLE AND SUPPORT WITH SAFETY STANDS. 2. PLACE THE COLUMN SHIFT SELECTOR LEVER IN "NEUTRAL" AND RUN THE ENGINE UNTIL THE PARKING BRAKE TELLTALE LAMP TURNS OFF. 3. DISCONNECT PROP SHAFT AT PARKING BRAKE DRUM. 4. DISCONNECT CLEVIS PIN (ITEM 1) IN LEVER BOX (NEAR TRANSMISSION) TO DISENGAGE ACTUATOR FROM PARKING BRAKE. THIS WILL ALLOW ADJUSTMENT OF THE PARKING BRAKE ASSEMBLY. 5. REMOVE THE DUST COVER ON PARKING BRAKE DRUM (ITEM 2) AND TURN THE DRUM TO ALIGN THE ACCESS HOLE IN THE DRUM WITH THE ADJUSTING STAR WHEEL. ADJUST STAR WHEEL UNTIL DRUM DOES NOT TURN. BACK OFF ADJUSTMENT BY 2 TO 4 NOTCHES. 6. DRUM SHOULD TURN FREELY WITH A MAXIMUM OF A LIGHT DRAG. 7. RECONNECT CLEVIS PIN (ITEM 1) IN LEVER BOX (NEAR TRANSMISSION) TO CONNECT ACTUATOR TO PARKING BRAKE. 8. TO OBTAIN CORRECT CABLE ADJUSTMENT, ADJUST THE PARKING BRAKE AUTO APPLY CABLE HEXAGONAL CLEVIS (ITEM 3) TO OBTAIN 31 MM TO 37 MM (1.30 INCHES TO 1.44 INCHES) TRAVEL AT THE ACTUATOR. TURN JAM NUT (ITEM 4) OUT AGAINST CABLE END FITTING AND TORQUE JAM NUT TO 48 N.M (35 LB FT). 9. WITH THE ENGINE OFF, MEASURE AND RECHECK ACTUATOR TRAVEL AFTER SHIFTING VEHICLE BETWEEN NEUTRAL AND PARK SEVERAL TIMES. IF THE ACTUATOR TRAVEL IS NOT 31 MM TO 37 MM (1.30 INCHES TO 1.44 INCHES), READJUST THE PARKING BRAKE AS DESCRIBED IN STEP 8. RECHECK AND READJUST AS REQUIRED. 10. RELEASE THE AUTO-APPLY PARKING BRAKE SYSTEM BY TURNING THE IGNITION ON AND PLACING THE COLUMN SHIFT SELECTOR LEVER IN NEUTRAL. ADJUST FOOT APPLY CABLE CLEVIS (ITEM 6) TO OBTAIN A FIRM PEDAL (60 LB. MINIMUM) AT 2-5 CLICKS. TORQUE JAM NUT (ITEM 7) AGAINST CLEVIS TO 7 N.M (5 LB FT). KENT-MOORE TOOL J 28662 IS AVAILABLE TO FACILITATE WITH THIS PEDAL ADJUSTMENT. 11. INSPECT TO ASSURE PROPER CLEARANCE OF CLEVIS AND COTTER PINS TO ALL OTHER COMPONENTS AND FOR PROPER OPERATION OF PARKING BRAKE SYSTEM. 12. RECONNECT PROP SHAFT. 13. LOWER THE VEHICLE.

WARRANTY INFORMATION

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME H2800 ADJUST ELECTRO HYDRAULIC PARKING BRAKE 0.6 HR

FIGURES: 1

CAPTIONS: FIGURE 1 - ELECTRIC/HYDRAULIC AUTOMATIC APPLY PARKING BRAKE SYSTEM

Object Number: 82658 Size: FS

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.