Workshop Repair and Service Manuals GMC SIERRA
Articles

00-05-22-002N Disc Brake Warranty Service and Procedures - (May 31 2013) Disc Brakes - part 10

Rating:
Check for clean and true lathe adapters and make surethe arbor shoulder is clean and free of debris or burrs. For more information seethe “Brake Lathe Calibration Procedure” section in this bulletin.

On the outboard area of the rotor, position the cutting tools one eighth of an inchinto the brake pad area of the rotor. Feed the cutting tools into the rotor untilthey cut the rotor to new metal, a full 360 degrees. Zero each dial and back off afull turn.Move the cutting bits to the middle of the rotor and do the same procedure. If zerois passed during the process, reset zero. Back off a full turn.Position the cutting bits one eighth of an inch inside the inboard (closest to thehub) edge of the brake pad contact area. Do the same procedure. If zero is passedduring the process, reset zero.Back off a full turn and position the cutting bits all the way inboard in preparationto refinish the full rotor surface. Advance both tool cutters to the zero settingplus just enough to clean up the entire rotor surface.After completing the refinish, sand both sides of the rotor for approximately oneminute per side using a sanding block and 130-150 grit sandpaper to obtain a non-directionalfinish.

Important:Only remove the necessary amount of material from each side of the rotor and notethat equal amounts of material do not have to be removed from both sides on any brakesystem using a floating caliper.

Important:In many of these instances, such a minimal amount of material is removed from therotor that customer satisfaction is not a concern for future brake services. Thisprocedure is intended to “Clean-up” the rotor surface and should be conveyed to thecustomer as such – not as “cut”, “refinish” or “machine”, which tends to be termsunderstood as a substantial reduction of rotor material/life. If the brakelathe equipment being used is not capable of removing minor amounts of material whileholding tolerances, further lathe maintenance, repair, updates or equipment replacementmay be necessary.

BRAKE NOISE

Some brake noise is normal and differences in loading, type of driving, or drivingstyle can make a difference in brake wear on the same make and model. Depending onweather conditions, driving patterns and the local environment, brake noise may becomemore or less apparent. Verify all metal-to-metal contact areas between pads, pad guides,caliper and knuckles are clean and lubricated with a thin layer of high temperaturesilicone grease.Brake noise is caused by a “slip-stick” vibration of brake components. While intermittentbrake noise may be normal, performing 3 to 4 aggressive stops may temporarily reduceor eliminate most brake squeal. If the noise persists and is consistently occurring,a brake dampening compound may be applied to the back of each pad. This allows partsto slide freely and not vibrate when moving relative to each other. Use Silicone BrakeLubricant, ACDelcoP/N-88862182 (Canadian P/N-88862496) or equivalent.

The following noises are characteristics of all braking systems and are unavoidable.They may not indicate improper operation of the brake system.

Special Tools     Illustrations Tool Number/Description J-26889 Accumulator Piston Compressor J-28662 Brake Pedal Effort Gauge J-29532 Diaphragm Pressure Bleeder J-35589-A Brake Pressure...
Rear Brake Caliper Hardware Replacement (JD9) Disc Brakes Brake Calipers     Rear Brake Caliper Hardware Replacement Callout Component Name Warning:Refer toBrake Dust Warning. Caution:Support the brake caliper with heavy mechanic wire, orequivalent, whenever it is separated from its mount...
Parking Brake Cable Adjuster Enabling Parking Brake Cable     Hold the park brake pedal in the FULL upward position. Pull rearward on the front park brake cable until the tensionis released from the tool-(1) installed in the pedalassembly.Remove the tool-(1).Slowly release the park...
Parking Brake Lever Pedal Assembly Replacement (Without TZ0) Parking Brake Lever or Pedal     Removal ProcedureRelease the parking brake.Raise and support the vehicle. Refer toLifting and Jacking the Vehicle.Loosen the intermediate parking brake cable equalizer nut. Drill a-3-mm-(1/8-in) hole through the dimple in...
Brake Warning System Description and Operation     Brake Warning IndicatorHydraulic Brakes Block Diagram B80 Park Brake Switch B20 Brake Fluid Level Switch K9 Body Control Module P16 Instrument ClusterHard-Wired Serial Data B80-Park Brake Switch B20-Brake Fluid Level Switch...
Rear Brake Caliper Bracket Replacement (JD9) Disc Brakes Brake Calipers     Rear Brake Caliper Bracket Replacement Callout Component Name Warning:Refer toBrake Dust Warning. Caution:Support the brake caliper with heavy mechanic wire, orequivalent, whenever it is separated from its mount and...