INFORMATION ON LUBRICATING CALIPER SLIDING SURFACES. GMC Truck GMC Suburban

SUBJECT:INFORMATION ON LUBRICATING CALIPER SLIDING SURFACES

MODELS: 1991-94 CHEVROLET AND GMC C3500HD W/JF9 BRAKES 1973-94 G3 CHEVROLET AND GMC VANS W/JB8 1973-87 CHEVROLET AND GMC C/K 3500 W/JB8 1988-91 CHEVROLET AND GMC R/V 3500 W/JB8

BRAKE WEAR IN THE ABOVE MODELS, MAY BE IMPACTED BY AN EARLY DEPLETION OF CALIPER RAIL SLIDE LUBRICANT. A LACK OF RAIL SLIDE LUBRICANT COULD RESULT IN PREMATURE BRAKE WEAR BY PREVENTING PROPER CALIPER ORIENTATION. VEHICLES OPERATING IN HIGH MOISTURE AND/OR DIRTY ENVIRONMENTS ARE MORE SUSCEPTIBLE TO AN EARLY DEPLETION OF LUBRICANT.

IT IS RECOMMENDED THAT AN AMPLE COATING OF AEROSHELL #5 GREASE BE APPLIED TO THE V-WAY SURFACES OF THE CALIPER HOUSING, THE ANCHOR PLATE RAIL SURFACES, AND THE CALIPER SUPPORT KEY, AFTER THOROUGHLY CLEANING THESE AREAS (SEE ILLUSTRATION). CARE SHOULD BE TAKEN IN KEEPING THE LUBRICANT AWAY FROM BRAKE PAD AND ROTOR SURFACES. THIS PROCEDURE SHOULD BE REPEATED AT THE TIME OF EACH BRAKE PAD CHANGE, OR WHENEVER THE CALIPER IS REMOVED FOR ANY REASON.

CURRENTLY THIS LUBRICANT CAN BE PROCURED FROM LOCAL SHELL DISTRIBUTORS OR THEIR RETAIL STORES IN VARIOUS SIZES INCLUDING 1 LB. CANS AND 14 OZ. CARTRIDGES, IN CASE LOTS.

WE BELIEVE THIS SOURCE AND THEIR EQUIPMENT TO BE RELIABLE. THERE MAY BE ADDITIONAL MANUFACTURERS OF SUCH EQUIPMENT. GENERAL MOTORS DOES NOT ENDORSE, INDICATE ANY PREFERENCE FOR OR ASSUME ANY RESPONSIBILITY FOR THE PRODUCTS OR EQUIPMENT FROM THESE FIRMS OR FOR ANY SUCH ITEMS WHICH MAY BE AVAILABLE FROM OTHER SOURCES.

FIGURES: 1

Object Number: 83069 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.