The handbrake didn't generate enough braking force on the tester to meet the minimum required for the vehicle. Note that this is a measured result — a handbrake that feels fine on a flat driveway can still be well under the limit.
Wording as it commonly appears on an MOT certificate: “Parking brake efficiency below requirement”.
What does it mean?
The handbrake didn't generate enough braking force on the tester to meet the minimum required for the vehicle. Note that this is a measured result — a handbrake that feels fine on a flat driveway can still be well under the limit.
How serious is it?
Usually recorded as: Major. The tester assesses the actual vehicle on the day, so your certificate is what counts.
What normally causes it?
- Stretched or seized handbrake cables, very common on cars that live outside
- Worn rear shoes inside a drum-in-disc parking brake setup
- Rear calipers where the handbrake mechanism has seized in the caliper body
- Simple maladjustment after a previous rear brake job
- On electronic parking brakes, a motor or actuator that isn't applying full clamping force
What a mechanic would check
First thing is whether both rear wheels lock or just one — that immediately splits cable and adjustment problems from a seized mechanism on one side. Then I'd have the drums or discs off to look at the shoe material and the state of the mechanism, and check the cables move freely through their outers.
What might need replacing
- Handbrake cables
- Rear shoes and fitting kit, or rear pads
- Caliper with a working handbrake mechanism
- Adjustment only, in some cases
Can you still drive it?
It's a failure, so the car isn't roadworthy as it stands. Practically, a weak handbrake means the car may not hold reliably on a hill, which matters as much when it's parked as when you're driving it.
Repair cost
Cables and adjustment sit at the cheap end; a rear caliper with a seized parking brake mechanism sits at the other. Have the cause identified first.
Before the retest
Brake work is usually done in axle pairs — pads and discs are replaced on both sides of the same axle so the car pulls up straight on the roller tester. After new pads or discs, drive gently for the first hundred miles or so if you can, because brakes need bedding in before they reach full efficiency. Keep the old parts or the invoice; a tester will not ask for them, but they settle any argument about what was actually replaced.
Retest rules
If the vehicle stays at the test centre for repair and is retested within 10 working days, a partial retest is often free; some items qualify for a free retest if you bring the car back by the end of the next working day. The exact conditions are set out on GOV.UK, so confirm with the test centre before you leave. A major or dangerous failure means the car cannot legally be driven away unless the previous MOT is still valid and nothing dangerous was recorded — check your certificate first.
Related help
More brakes failures · MOT failure decoder · Ask a mechanic about your certificate
This is general guidance from a UK mechanic, not a substitute for a physical inspection. Only the tester who inspected your vehicle can confirm what was recorded and why.