Document Ed617Jn59ME79rvMK9qe65NJb

LESSON TWO-DEMONSTRATION 2 Lining Material Transfer MACHINING Item 1 Rotor Description Item 2 Description Lining Transferred To Rotor As the vehicle is driven, lining material can become attached to the disc brake surface in very small amounts. Lining transfer is normal, but with some pad materials the transfer can be uneven or excessive in certain conditions. Lining material transfer creates an uneven friction surface on the rotor. The brake pads tend to grab where material has transferred to the rotor and this is felt in the steering wheel and the vehicle. If there is no runout or DTV, but the vehicle still has the roughness symptoms, lining material transfer may be the cause. Rotor Corrosion Rotor corrosion on the friction surface is caused when a vehicle is not driven for long periods of time. The brake pad material may remove the corrosion when the vehicle is driven; however, some pad materials are able to remove corrosion from rotors better than others. DTV can be created by the uneven braking surface if all of the corrosion is not removed. Corrosion can also cause excessive lining material transfer. DTV is also caused when the area under the pad is not as heavily corroded as the rest of the rotor. 80 September, 2005 Brake System Diagnosis and Repair