Brakes - Abnormal Vibration When Braking
46 11 05April 15, 2011
2010245 Supersedes T.B. V460901 dated July 27, 2009 to remove Canadian market and include additional models and model year applicability.
Vehicle Information
Condition
Vibration When Braking, All Vehicles Except Routan (U.S. Only)
Vibration when braking may be due to brake disc corrosion protection which has not been completely removed by normal braking.
Tip:
Production Solution
No production change required.
Service
Vehicle Inspection
Note:
Abide by ALL traffic laws and be mindful of the vehicles around you while operating the vehicle.
^ Check and adjust tire pressure.
^ Accelerate vehicle to greater than 55 MPH (80 km/h).
^ Apply brake firmly.
Tip:
Vehicles requiring front disc cleaning will exhibit vibration.
Warning
The following steps apply to vehicles without Electronic Parking Brake (EPB):
^ Accelerate vehicle to 30 MPH (50 km/h).
^ Carefully apply parking brake.
If vibration IS observed:
Clean all front and rear brake discs.
If vibration IS NOT observed:
Clean only front discs.
Disassembly Inspection
^ Remove wheels, disassemble brake calipers and remove brake disc. See appropriate Repair Manual for vehicle you are servicing.
^ Paint mark or scribe brake discs for reinstallation (Left/Right).
^ Paint mark brake pads for reinstallation (Left/Right, Inner/Outer).
^ Inspect all brake components for damage from outside influences.
^ Using micrometer, measure brake disc thickness. See appropriate Repair Manual in ElsaWeb for minimum brake disc thickness.
Brake Disc Surface Cleaning
Remove remaining corrosion protection coating as follows:
^ Sand brake disc surfaces until clean metal is visible using 40-grit sanding disc in a clockwise direction using leading edge of sanding disc (1-2 minute per surface).
Replace sanding disc prior to moving to next brake disc surface.
To achieve a crosshatch pattern:
^ Repeat sanding process using 80-grit sanding disc in a clockwise direction using trailing edge of sanding disc.
Replace sanding disc prior to moving to next brake disc surface.
Clean all brake disc friction surfaces using soap and water solution.
Deglaze and Clean Brake Pads
^ Place 80-grit sand paper on flat hard surface.
^ Carefully sand brake pads until the surface glazing is removed.
^ Measure brake pad thickness using metric scale. If any brake pad is equal to or less than 50 percent of original thickness of new brake pads (excluding backing plate):
^ Replace all 4 brake pads on axle you are servicing.
Tip:
See appropriate Repair Manual in ElsaWeb for new brake pad thickness dimensions.
Reassembly
^ Install brake discs, brake pads, brake calipers and wheels. See appropriate Repair Manual in ElsaWeb for vehicle you are servicing.
^ Road test vehicle to confirm vibration concern is corrected.
No Special Parts required.
Warranty
Required Parts and Tools
No Special Parts required.
Additional Information
All part and service references provided in this Technical Bulletin are subject to change and/or removal. Always check with your Parts Dept. and Repair Manuals for the latest information.