Symptoms
- Steering wheel shaking when braking, especially from motorway speeds
- Pulsing or vibrating sensation through the brake pedal
- Front-end shake that worsens when braking harder
- Car pulling to one side under braking
Cause 1: Warped or Uneven Brake Discs (Most Common)
Brake discs can become slightly uneven in thickness, a condition called disc thickness variation (DTV). This is the most common cause of brake judder. When the brake pads press against an uneven disc surface, the varying resistance creates a pulsing sensation through the pedal and steering wheel.
This is caused by: excessive heat from prolonged heavy braking (motorway driving, towing), normal wear over time, or rapid cooling after heavy braking.
Fix: Replace the brake discs (usually in pairs on the same axle). Pads are typically replaced at the same time.
Cause 2: Worn or Glazed Brake Pads
Brake pads that have worn unevenly, or that have become glazed (hardened surface from excessive heat), can create uneven braking force and contribute to judder.
Fix: Replace brake pads. If the discs have uneven deposits from glazed pads, the discs may also need replacing.
Cause 3: Suspension Wear
Worn suspension components, particularly control arm bushes, ball joints, or track rod ends, can allow excess movement during braking, causing a shaking or pulling sensation. This type of judder is often felt at lower speeds too, not just during heavy braking.
Fix: Inspect and replace worn suspension components. A suspension inspection is recommended alongside any brake work.
Cause 4: Wheel and Tyre Issues
Wheel imbalance, bent alloy wheels, or corrosion build-up between the hub and wheel can all cause vibration that's more noticeable under braking.
Fix: Wheel balancing, tyre inspection/replacement, or hub cleaning.
Preventing Brake Judder
- Use quality branded discs and pads, cheap components wear unevenly
- Bed in new pads correctly, after fitting, perform 5–10 gentle stops from 30mph to allow the pad material to transfer evenly onto the disc
- Avoid prolonged heavy braking where possible, downshift on long descents to share the load
- Have wheels torqued to the correct setting, overtightening distorts discs