Brakes - Rear Brakes Vibrate Upon Application

BRAKES
BR003-02
REVISED

Title:
REAR BRAKE VIBRATION

Models"
'00 - '05 Tundra

September 16, 2002

TSB REVISION NOTICE:
^ April 4, 2005: Applicable Vehicles has been updated to include 2003 - 2005 model years. Parts Informations table has been updated. Required SSTs table has been added. The Warranty Information has been updated. The Diagnosis Procedure and Repair Procedure have been combined into one Repair Procedure section. The Repair Procedure section has been updated. PLEASE READ ENTIRE TSB.

The previous TSB should be discarded.

Introduction

New brake drums have been introduced for use as service parts on 2000 - 2005 model year Tundra trucks to reduce rear brake vibration. The new drum has increased mass and rigidity.

Applicable Vehicles

2000 - 2005 model year Tundra vehicles.





Parts 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.

Applicable Warranty*:
The replacement of the Rear Axle Shaft is covered under the Toyota Powertrain Warranty. This warranty is in effect for 60 months or 60,000 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 SSTs

Repair 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 an 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" and then press the PKB pedal a second time so it will disengage when 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 - 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.

Proceed to the Repair Procedures that follow.

F. If no vibration is felt during step C, then the front brake assemblies are the cause of brake vibration on this vehicle.

Refer to TSB No. BR004-02, "Front Brake Vibration," for parts and repair information relating to Tundra front brake vibration.





3. Measure the rear axle shaft centering area diameter. If the measured value deviates from the standard (105.946 - 106 mm [4.171 - 4.173 in.]), replace the rear axle shaft (Standard: Refer to Figure 1).





NOTE:
If replacing the rear axle shaft and if the vehicle is equipped with ABS, ensure proper installation of the ABS speed sensor rotor and the bearing retainer (differential side). Use SST P/N: 09521-25011-01 to press and install a new sensor rotor and new bearing retainer to the axle shaft (Refer to Figure 2).

4. Replace the rear brake shoes and brake drums. For additional information on rear brake shoes and brake drum replacement, refer to the Technical Information System (TIS): 2000 - 2005 model year Tundra Repair Manual: Brakes: Rear Drum Brake: Removal/Installation.

5. Adjust the PKB to specifications.

6. Remount the tire and wheel assembly to the vehicle. Torque all wheel nuts to the vehicle according to the vehicle specifications found in TIS: 2000 - 2005 model year Tundra Repair Manual: Brakes: Rear Drum Brake: Removal/Installation.

7. Road test the vehicle to determine if all brake vibration has been eliminated.

8. If brake vibration remains, determine if the vibration is from the front or the rear (while brakes are still warm from confirmation driving). If it is front vibration, refer to TSB No. BR004-02, Front Brake Vibration," for parts and repair information relating to Tundra front brake vibration.