The parking brake (commonly called the handbrake in the UK) is a vital safety feature that mechanically locks the rear wheels to prevent your vehicle from rolling away when parked, especially on hills. It operates independently of the main hydraulic footbrake system.
Traditional mechanical handbrakes use a lever (or sometimes a foot pedal) to pull cables that activate brake shoes in rear brake drums or the calipers on the brake pads to brake discs
.
Modern vehicles often feature an electronic parking brake (EPB), activated by a dashboard button, where electric motors on the rear calipers apply the braking force automatically and many include auto-hold functions.
Unfortunately, parking brake systems can fail due to stretched or corroded cables in mechanical types (causing poor holding power or seizure), worn components, lack of use leading to rust, or—in electronic systems—electrical faults, low battery, faulty actuators, or sensor issues. Regular checks and adjustments during servicing help prevent these problems and ensure reliable operation.
In vehicles equipped with rear drum brakes:
The parking brake (or handbrake) works by mechanically expanding the brake shoes against the inside of the brake drum using a lever and cable system, independently of the hydraulic foot brake.
During routine servicing, proper handbrake adjustment is essential to ensure the shoes sit close enough to the drum for quick and effective engagement without excessive lever travel, while preventing binding that could cause overheating or premature wear.
Common signs of issues include:
Poor holding power on hills.
The handbrake lever pulls up too high indicating stretched cables or worn brake shoes / pads.
The handbrake lever may feel loose, slack, or spongy with little tension when the parking brake is not applied.
A dragging sensation when driving suggesting over-adjustment or seized components.
An illuminated handbrake warning light that stays on.
New brake drum.
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