The handbrake, sometimes called the parking brake, is checked as a standard part of every MOT. Failures on this item are more common than many drivers expect, particularly on older vehicles.
What the MOT tester checks
The tester applies the handbrake and then measures braking efficiency using a rolling road tester or an alternative approved method. The handbrake must generate a minimum braking efficiency of 16 percent. In practice, a well-maintained handbrake should comfortably exceed this.
The tester also checks the mechanism: the lever or button must operate smoothly, the ratchet must hold (on cable-operated systems), and there must be adequate travel remaining before the mechanism reaches its limit of adjustment.
Common handbrake MOT failures
- Low efficiency due to worn rear brake pads or shoes (rear brakes do most of the handbrake work on most vehicles).
- Corroded or seized rear caliper on cars with integrated electric or mechanical parking brake on disc brakes.
- Stretched or corroded cables on cable-operated handbrakes reducing travel and effectiveness.
- Rear drum brakes out of adjustment on older cars.
Electronic handbrakes
Many modern cars have an electronic parking brake (EPB) operated by a button rather than a lever. These are tested in the same way for braking efficiency. An EPB that develops a fault (warning light on the dashboard) may also be an MOT failure if the fault affects braking function.
Keeping the handbrake in good condition
Avoid leaving the handbrake applied for extended periods on older cable-operated systems, particularly in very cold or wet conditions. Cables can freeze in the applied position and require significant force to release, damaging the mechanism. Use a gear or wheel chocks if parking for a long period in such conditions.
If your handbrake feels spongy, does not hold on a slope, or makes unusual noises, call Steins Garage on 0131 554 3423 or book a brake check online.