Brakes - Vibration From Front Brakes: Overview
BRAKESBR004-02
REVISED
Title:
FRONT BRAKE VIBRATION
Models:
'00 - '03 Tundra
September 16, 2002
TSB REVISION NOTICE:
^ September 24, 2004: A note has been added, step 26.
^ March 5, 2004: A torque speification, step 24, was changed.
^ September 8, 2003: A torque specification, step 28, was changed.
Previous versions of this TSB should be discarded.
Introduction
Under certain usage conditions, some Tundra trucks may exhibit front brake vibration. Improved brake caliper assemblies have been introduced to correct this condition.
Applicable Vehicles
2000 - 2003 model year Tundra trucks built before the VIN shown below.
Production Change Information
Warranty Information
Applicable Warranty*:
This repair is covered under the Toyota Comprehensive Warranty. This warranty is in effect for 36 months or 36,000 miles, whichever occurs first, from the vehicle's in-service date.
* Warranty application is limited to correction of a problem based upon a customer's specific complaint.
Required Tools & Material
Parts Information
Diagnosis Procedure
1. Confirm the customer complaint.
2. Determine if vibration is from front or rear (while brakes are still warm from confirmation driving).
The following procedure will isolate the drum brakes from the rest of the hydraulic system by using the parking brake (PKB).
NOTE:
Remember, with a foot PKB (on automatic transmission) the pedal must be pressed a second time to disengage the parking brake.
HINT:
When diagnosing a Tundra with a foot PKB, slowly apply the PKB until the first "click, " then press the PKB pedal a second time so it will disengage if it is released.
At this time the PKB can be pressed to the desired level for continued diagnosis.
A. Drive the Tundra along a smooth, level section of road at approximately 40 mph - 50 mph.
B. Slowly apply the PKB while driving until the brake begins to engage and slow the vehicle. Do not apply the PKB past this point of initial engagement.
C. Hold the PKB at this point of initial engagement for a few seconds to slowly reduce the vehicle speed and allow adequate time to monitor the ride condition.
D. Disengage the PKB.
E. If brake vibration is felt during step (C), then it indicates that the rear brake drums are one source of brake vibration on this vehicle.
Refer to TSB BR003-02 for parts and repair information relating to Tundra rear brake vibration.
F. If no vibration is felt during step (C), then the front brake assemblies are the cause of brake vibration on this vehicle.
Proceed to the following repair procedure.