What Is the Handbrake?
The handbrake — officially called the parking brake — is a secondary braking system designed to hold your car stationary when parked. Unlike the foot brake (which is hydraulic), the handbrake is usually a purely mechanical cable system, making it independent of the hydraulic braking system.
In most NZ passenger cars, the handbrake operates the rear brakes only — either:
- Clamping rear drum brake shoes against the drum, or
- Actuating a small internal expanding mechanism inside a rear disc brake assembly (using a separate set of shoes behind the rotor, or a "drum-in-hat" design)
Some newer vehicles (e.g., later-model Subaru Outbacks, European cars) use an electric parking brake (EPB) — a button or switch that activates electric motors in the rear calipers.
How Does the Cable Handbrake Work?
Pulling the handbrake lever (or pressing the parking brake pedal in some vehicles) pulls a steel cable that runs to both rear wheels via a splitter. The cable tension mechanically applies the rear brakes with enough force to prevent the car rolling. A ratchet mechanism holds the lever in position until you release it.
The cable is adjustable — either at the lever end, the cable adjuster under the car, or via the rear brake self-adjuster mechanism. As rear brake linings wear or the cable stretches, the handbrake requires more travel (pulling the lever higher) to achieve full engagement.
Signs the Handbrake Needs Attention
- Lever goes too high — pulling the lever 7–10+ clicks before the brake holds indicates a stretched cable or worn rear brakes
- Car rolls when parked — the handbrake is not holding. Do not park on hills with a failed handbrake; use wheel chocks and leave the car in gear
- Handbrake light stays on while driving — the switch may be faulty, or the brake is partially applied (dragging)
- Rear brakes feel uneven — a seized handbrake mechanism can hold one rear brake applied, causing drag, wear, and pulling
The Handbrake as an Emergency Brake
The handbrake provides a backup in the extremely rare scenario of complete hydraulic brake failure. However, applying it at speed on a modern disc-brake car should be done very carefully — pulling hard while moving can lock the rear wheels and cause the car to spin. Some driving schools teach controlled use of the handbrake for low-speed manoeuvres (hill starts, parking on steep kerbs).
Regular Adjustment: Why It Matters
Unlike the hydraulic brakes, the handbrake cable does not self-adjust. Over time:
- The cable stretches with use
- Rear brake linings wear, giving the handbrake mechanism less to bite against
- Cable guides and pivots corrode in NZ's wet and salty conditions, increasing friction in the cable
A handbrake that takes 10+ clicks to hold the car is both ineffective and a WoF failure. NZTA inspectors test that the handbrake holds the vehicle on a slope without excessive lever travel.
Electric Parking Brakes (EPB)
Modern EPBs apply via a button and do not have a conventional cable. Adjustment is performed electronically — often automatically when the vehicle is serviced or via a scan tool. Faults show up as a warning light on the dashboard. Do not attempt to manually adjust or work on EPB calipers without the correct software — the motor can activate unexpectedly and cause injury.
How Much Does Handbrake Service Cost in NZ?
| Service | Estimated NZD Cost |
|---|---|
| Cable adjustment | $60–$100 |
| Cable replacement | $150–$300 |
| Rear brake shoes replacement (drum) | $180–$320 |
| EPB caliper service/replacement | $300–$600+ |
When to Book a Mechanic
Book at your next service if the lever travel has increased noticeably. Book sooner if:
- The car moves when the handbrake is applied on a slope
- The handbrake warning light stays on while driving
- There is a grinding or dragging sensation from one rear wheel
Include handbrake adjustment as a routine item at every service, especially on cars with drum rear brakes.