Canada - Brakes - Rear Brakes Vibrate Upon Application
Bulletin
TSB1119R
Issue Date
2002-09-16
Market
Canada
Title
Rear Brake Vibration
Component
Brakes
Models
'00 - '05 Tundra
TSB REVISION NOTICE:
- March 07, 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:
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 1261 for parts and repair information relating to Tundra front brake vibration.
Measure the rear axle shaft centering area diameter. If the measured value deviates from the standard (105.946 - 106 mm), replace the rear axle shaft (Standard: Refer to Figure 1).
NOTE:
If replacing rear axle shaft and if vehicle is equipped with ABS, ensure proper installation of ABS speed sensor rotor and 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 ETAS: 2000 - 2005 model year Tundra Repair Manual: Brakes: Drum Brake: Removal/Installation.
5. Adjust the parking brake to specifications.
6. Remount the tire and wheel assembly to the vehicle. Torque all wheel nuts to the vehicle according the vehicle specifications found in ETAS: 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 TSB1261 for parts and repair information relating to Tundra front brake vibration.
NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.