Most cars built in the last ten years have an electric parking brake: a small switch instead of a handbrake lever. It is neat and it frees up space, but when it goes wrong you can be left with a car that will not hold on a hill, or one that will not release at all. A "parking brake fault" message is common, especially in cold, damp weather, and the cause is often simpler and cheaper than it looks. Here is what the warning means, what usually causes it, what the repairs cost in the UK and where a warranty fits in.
How an electric parking brake works
On most cars, the electric parking brake (EPB) uses a small electric motor bolted to the back of each rear brake caliper. When you pull the switch, a control unit tells the motors to wind the brake pads against the discs, and to release them when you drive off. Some older or larger cars use a single motor in the middle of the car that pulls conventional cables instead.
The system is linked to the rest of the car. It applies itself automatically when you switch off on many models, releases when you pull away with your seatbelt on, and works with the "auto hold" button that keeps the car still at traffic lights. That also means it relies on a healthy battery, good wiring and the right information from other control units.
What the warning lights mean
- Red "P" or "(P)" light on steadily: the parking brake is applied. Normal when parked.
- Red light flashing, or an amber "P" or a spanner symbol with "!": the system has detected a fault. You will often see a message such as "Parking brake fault", "EPB malfunction" or "Parking brake: service required".
- Brake warning light and ABS light together: may point to a wheel speed sensor or ABS fault rather than the parking brake itself, because the systems share information.
If the amber fault light comes on, the parking brake may still work but cannot be relied on. Park in gear (or in P on an automatic) and on level ground, and get it checked. Our dashboard warning lights guide explains the other lights you may see at the same time.
Common causes of an electric parking brake fault
- Low battery voltage. The EPB motors draw a lot of current for a moment. A weak battery, especially on a cold morning, is the single most common cause of a temporary fault message. If the warning appeared after the car struggled to start, test the battery first.
- A failed caliper motor. Water gets into the motor or its connector, the internal gears wear, or the motor seizes. This is the most common hardware failure and usually affects one side.
- A seized caliper or corroded brake parts. If the caliper piston or slide pins are stiff, the motor cannot move them and reports a fault.
- Damaged wiring. The wires to the rear calipers flex with the suspension and sit in the spray from the road. Chafed or corroded wiring and connectors are common.
- Worn rear pads that were not replaced correctly. The motor has to be wound back with a diagnostic tool before new pads go in. Forcing the piston back by hand can damage the motor.
- A faulty switch or control module, less common but possible, especially after water has leaked into the cabin or the module has been affected by low voltage.
What to do if the electric parking brake will not release
- Check the basics. Engine running, foot firmly on the brake pedal, seatbelt fastened and doors closed, then press the switch down to release. Many cars will not release unless all of these are true.
- Turn the car off and on again. Switch off, lock the car, wait a few minutes and try again. This resets the control units and clears many temporary faults.
- Check the battery. If the car was slow to crank, a jump start or a charge may be all it needs.
- Look in the handbook for the emergency release. Some cars have a manual release, a cable or a tool in the boot. Many do not, and their brakes can only be released with a diagnostic tool or by removing the motor.
- Call for recovery if it still will not release. Do not try to drive with the rear brakes on: it will overheat and damage the pads and discs, and can make the car hard to control.
If the brake will not apply, park in gear on level ground, turn the wheels into the kerb, and use a wheel chock if you have one until it is fixed.
How much does an electric parking brake repair cost in the UK?
These are typical independent-garage prices including parts, labour and VAT for an average car. Main dealers, premium brands and cars where the motor only comes as part of a complete caliper will be higher.
| Repair | Typical UK cost |
|---|---|
| Diagnostic scan and fault reading | £40–£90 |
| New 12V battery (if low voltage is the cause) | £100–£250 |
| Wiring or connector repair to the rear caliper | £80–£250 |
| Caliper motor (actuator), one side | £180–£450 |
| Complete rear caliper with motor, one side | £300–£650 |
| Parking brake switch | £80–£250 |
| EPB control module, including coding | £300–£900 |
| Rear pads and discs (EPB car, with service tool) | £180–£350 |
Many motors are sold separately from the caliper and simply bolt on, which keeps the cost down. On some cars the motor and caliper only come as one unit. Whatever is replaced, the system usually needs a diagnostic tool afterwards to calibrate it, so make sure the garage has the right equipment. The same applies to a routine rear brake job: ask for a garage that can put the EPB into service mode.
Is an electric parking brake fault an MOT failure?
Yes, it can be. The MOT checks that the parking brake holds the car and that the system works. An EPB that does not apply, or one that has its warning light showing a malfunction, is a major defect and a fail. An inoperative parking brake can be a dangerous defect. If the fault light is on before your MOT, get it sorted first. Our guide to the most common MOT failures covers the other brake checks.
Which cars have the most electric parking brake problems?
Electric parking brakes are now fitted to everything from superminis to large SUVs, and faults are reported across most makes. Caliper motor failures are frequently mentioned by owners of Volkswagen Group cars (VW, Audi, SEAT, Skoda), Ford, Vauxhall, Peugeot, Citroën, Renault and Nissan models, largely because so many of them are on UK roads. Cars that do lots of short trips, are parked outside or driven on salted winter roads tend to suffer most from corrosion at the rear calipers. See our brand guides for the faults to watch on your make, for example Volkswagen or Ford.
Does a car warranty cover an electric parking brake?
It depends on the part. Brake pads and discs are wear items and are not covered by mechanical breakdown warranties. The electrical parts of the system are a different matter: many warranties list the parking brake motors, switch and control module among the covered electrical components when they fail suddenly. Seized calipers caused by corrosion, and damage from pads being fitted without winding the motor back, are usually excluded.
Always check the What Is Covered schedule for your own policy rather than assuming. With ClearPath, eligible claims are covered up to £3,000 per claim, including parts, labour and VAT, with labour up to £100 an hour, a £100 excess and no limit on the number of eligible claims. The garage must contact us and get authorisation before any work starts, and cover includes recovery up to £60 after a covered breakdown, within the claim limit.
How to avoid electric parking brake problems
- Look after the battery, particularly in winter. Replace it when it starts to struggle rather than waiting for it to fail.
- Use the parking brake regularly, so the mechanism keeps moving. Cars that sit for weeks are more likely to seize.
- Have the rear brakes serviced by a garage with the right tool, and ask them to check the motors, wiring and caliper slides at the same time.
- Wash the underside in winter to get rid of road salt.
- Do not ignore an intermittent fault message. It is often a wiring or motor problem getting worse.
The bottom line
An electric parking brake fault message is often caused by a weak battery, so test that first. If a caliper motor has failed, expect roughly £180–£450 per side at an independent garage, or up to £650 if the whole caliper has to be replaced, and more for a control module. Never drive with the rear brakes stuck on, and get the fault fixed before your MOT. To see what cover costs for your car, get an instant quote.
