Jan
29
Service Slants
Filed Under Chevy Cars
Brake pedal pulsation, vibration. Owners of 2000-05 Tundra pickup trucks may complain of a pedal pulsation and/or vibration through the steering column when the brakes are applied on the open road. While warped front rotors are always a possibility, out-of-round rear brake drums are just as likely a cause, says Toyota.
Start your diagnosis by taking the truck on a road test and applying the brakes a few times to confirm that the pulsation/vibration problem exists. If it does, get the vehicle back up to 40 to 50 mph and slowly apply the parking brake. Don’t overdo it; you could lock up the rear wheels! Apply the brake just enough so the rear shoes engage the drums. If you don’t feel the bad vibes when the parking brake is applied, the problem is in the front brakes. Machine or replace the front rotors as necessary. If a pulsation/ vibration does set up as you apply the parking brake, the problem is in the rear braking system.
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Before replacing the drums, however, check the diameter of the centering area on both rear axle shafts with a vernier caliper or micrometer, as shown in the illustration at right. The diameter should be 4.171 to 4.173 in. If it’s larger than that, the drum(s) could run oblong on the shaft(s), says Toyota. Replace the axle shaft(s) as necessary.
If the axle shaft specs are on the money, that confirms that the rear brake drums are warped or out-ofround. New-design, more rigid drums with greater mass are now available from Toyota, and they go by Part No. 42431-34021. Always replace the drums in pairs.
