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While brake pads provide the friction, brake discs provide the surface for that friction to happen.
They are the circular metal plates that sit behind your wheels and they rotate at the same speed as the wheel turning.
When you apply the brakes, the brake pads are clamped down onto the discs. This creates the friction necessary to stop the car.
Over time, discs can become thinned, warped, or corroded. To ensure balanced braking, we always recommend replacing discs in pairs.
Pulsating brake pedal.
A pulsating brake pedal is a sign of warped brake discs by high temperature or corrosion on the braking surface.
Warping is sometimes visible on the disc itself as a dark patch.
If the front discs are at fault you would usually also feel the same pulsation the through the steering wheel as the brake pedal.
If the rear discs are at fault you would also feel the same pulsation through the base of your seat as the brake pedal.
Hot patch on warped disc.
Hot patch on warped disc.
Corroded Braking surface.
Corroded Braking surface.
Good, clean braking surface.
Good, clean braking surface.
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