Brakes - Front Brake Vibration On High Speed Braking
T-SB-0131-12
August 8, 2012
Front Brake Vibration
Service Category
Brake
Section
Brake (front)
Market USA
Applicability
Introduction
Some 2008 - 2012 model year Sequoia and 2007 - 2012 model year Tundra vehicles may exhibit a front brake vibration when braking at higher speeds. Revised ventilated backing plates are now available to address this condition.
Production Change Information
This bulletin applies to vehicles produced BEFORE the Production Change Effective VINs shown.
Warranty Information
Parts Information
Required Tools & Equipment
Repair Procedure
1. Test drive the vehicle to confirm the condition.
2. Based on rotor thickness measurement, determine if enough disc material is present to support machining. If there is not enough material, replace the rotors.
Front Rotor Minimum Thickness: 29 mm (1.14 in.)
NOTE
If an on-car brake lathe is not available, replace the front rotors.
3. Replace the RH and LH disc brake dust covers.
A. Loosen the clip and remove the speed sensor wire.
B. Loosen and remove the bolts and disconnect the brake tube bracket from the steering knuckle.
C. Remove the 2 bolts and remove the disc brake caliper from the steering knuckle.
D. Remove the front disc.
E. 2WD Models: Remove the front hub sub-assembly.
(1) Loosen the 4 bolts that hold the hub and disc brake dust cover.
(2) Remove the front hub sub-assembly with the disc brake dust cover.
F. 4WD Models: Remove the front hub sub-assembly.
(1) Remove the dust cap.
(2) Remove the cotter pin.
(3) Remove the nut retainer.
(4) Using a 39 mm socket, remove the axle nut.
(5) Remove the 4 bolts and gently tap out the axle assembly.
(6) Remove the hub sub-assembly with disc brake dust cover.
G. After the hub sub-assembly and disc brake dust cover have been removed, check the inner portion of the knuckle for any damage or contaminants.
H. Install the NEW disc brake dust cover.
4. Reinstall the remaining components by performing previous steps in reverse order for both 2WD and 4WD.
5. If reusing the front rotors, install the on-car brake lathe and machine rotors to proper specification.
NOTE
Make sure the rotors are clean and contaminant free using a Toyota approved brake cleaner.
A. After machining rotors, use a dial indicator to measure disc runout 10 mm (0.394 in.) from the outer edge of the disc.
B. If unable to machine rotors to within specified runout range or rotors are below minimum thickness after machining, replace the front rotors.
Maximum Disc Runout: 0.05 mm (0.00197 in.)
Front Rotor Minimum Thickness: 29 mm (1.14 in.)
6. If replacing the front rotors, install NEW rotors and temporarily install lug nuts on rotors using proper torque value and sequence.
Using a dial indicator, measure the disc runout 10 mm (0.394 in.) from the outer edge of the disc.
If new rotors are above maximum disc runout, phase match the rotor to the hub assembly and recheck runout. Continue rotating rotor on hub and checking runout until measurement is below maximum disc runout specification.
NOTE
Regardless of whether the rotors are machined using the on-car brake lathe OR new rotors are installed, make sure the rotors are clean and contaminant free using a Toyota approved brake cleaner.
7. Install the front wheel and torque to specification using the correct tightening sequence.
Torque: Steel Wheel: 209 N*m (2,131 kgf*cm, 154 ft*lbf)
Torque: Alloy Wheel: 131 N*m (1,336 kgf*cm, 97 ft*lbf)
NOTE
Do NOT use an impact gun to tighten the lug nuts, use a torque wrench and follow the correct sequence to tighten the wheels.
8. Test drive the vehicle and con.rm that the condition is no longer present.
© 2012 Toyota Motor Sales, USA