Parking Brake Not Holding
If the car rolls on a slope with the parking brake applied, the handbrake cable may be stretched, the rear shoes or pads worn or contaminated, or the self-adjuster or electric parking brake faulty.
Critical risk
Stop relying on it now. Park in gear or in P and chock the wheels until it is repaired.
Short answer · Why does my handbrake not hold the car?
Mechanical handbrakes use a cable to pull the rear brakes on. The cable stretches and the shoes or pads wear, so the lever travels further and holds less. Oil or brake fluid on the rear brakes reduces grip. Electric parking brakes can lose holding force if a motor, sensor or adjustment fails.
Safe checks you can do
- Test on a gentle slopeWith the engine running and your foot ready on the brake, see if the car stays put.Keep your foot ready on the footbrake during the test.
- Count the lever clicksMany more clicks than before point to cable stretch or wear.
- Check for warning lightsElectric parking brakes show a fault light.
Questions that narrow it down
- Does the lever go up further than before?Cable stretch or worn shoes.
- Is there an electric parking brake warning?Read the codes.
- Is there fluid on the inside of a rear wheel?Contamination reduces grip.
Possible causes
Listed without ranking. Use the questions above to see which ones fit your car.
- Stretched handbrake cableLever travels further.
- Worn rear shoes or padsLess holding force.
- Contaminated rear brakesOil or fluid on the linings.
- Faulty self-adjusterShoes not adjusted.
- Electric parking brake faultMotor or sensor problem.
Questions about Parking Brake Not Holding
Can a handbrake be adjusted?
Many mechanical handbrakes can be adjusted, but worn parts must be replaced.
Is it an inspection item?
Yes. Parking brake efficiency is checked in most inspections.