Brakes
What are Brake Discs?
The metal rotor your brake pads clamp onto — the actual friction surface that does the stopping.
Simplified animation — not to scale.
In plain English
The disc, or rotor, is the flat metal plate bolted to the wheel hub that the pads squeeze against. Most bikes use two up front for stopping power and one at the rear.
A simple analogy
“The dance floor for your brake pads — the surface they grip to slow everything down.”
How it works
As the caliper clamps the pads onto the spinning disc, friction generates significant heat, which the disc's drilled or slotted pattern helps to shed quickly. Repeated heavy braking can warp a disc or wear it thinner than its minimum safe thickness.
Signs of trouble
- ⚠Pulsing or judder felt through the lever or pedal
- ⚠Visible scoring, grooves or blueing on the surface
- ⚠Disc thinner than the minimum marked thickness
- ⚠Vibration that worsens under braking
Rough UK cost
£60–£250
Parts: £40–£200
Labour: £20–£60
Always get a written quote. Prices vary by bike, region, and parts brand.
Heads up: Motoautonomy is for general guidance only. If your bike is showing warning lights or behaving oddly, get it looked at by a qualified mechanic.