How can I tell if my rotors are warped?
The main symptom of warped rotors is a pulsation felt in the pedal when brakes are applied. If the vibration is felt in the steering wheel and pedal, it’s most likely a front rotor problem, if the pulsation is in the pedal only, it is most likely the rear rotors. Either way, only a dial indicator test can show whether the rotors are actually warped, or it is another problem. (max. dial .1mm)
Brake rotors don’t warp unless overheated. It’s very common to misdiagnose tyre or suspension problems and attribute them to a warped brake rotor. Warping is caused by excessive heating of the brake rotor and the resulting distortion of the cast iron.
Can I reuse my old brake rotors with new pads?
As long as the old rotors have been resurfaced to square the mating surface and remove any old pad transfer film, there should be no major issues reusing your old rotors. Rotors must be checked after machining to ensure they are over minimum thickness and checked for run-out when mounted back on the car (max .1mm).
Why are my new brake pads producing noise?
New brake pads often produce some initial noise which will diminish as the transfer film is built up on the rotor surface. This is normal for most brake pads and it will go away as the surfaces properly bed-in. Following the bed-in procedures provided by the manufacturer will assure a smooth, even layer of transfer film on the rotor. This helps to minimize brake shudder and the possibility of warping due to uneven heating.
What are glazed pads?
Brake pads that have been over heated crystalize on the surface as the resins and binders begin to melt and break down. The crystallized surface has a lower friction coefficient and cannot grab the surface of the rotor with the same amount of force as the undamaged pad. The surface of these pads appears glossy, hence the term glazed. Damaged pads due to overheating are never covered under any warranties. Following manufacturers bed-in recommendations and using pads rated to the intended use will ensure glazing does not happen.
Is there such a thing as a dust-free brake pad?
All brake pads produce dust of some sort. Pads that produce a light brown colour will appear as less dusty than those that create darker shades.
Can I install new brake rotors with my old brake pads?
It is strongly recommended that you never install used pads on a new or resurfaced brake rotor. The pads will have taken the shape of the old rotors, decreasing the friction contact area, leading to poor and dangerous braking.