How rear brake pads work
Brake pads are designed to work with a car’s brake discs, to slow it down. They are installed in the brake callipers and are pushed against the discs by pistons, which are in turn moved by brake fluid that is pressurised via the master cylinder.
Some cars have brake pad wear indicators, which illuminate a light on the dashboard when the pads have worn down to a set limit. But they're more common on the front brake pads, so the only way of telling how worn a pad is is to examine the level of fluid in the brake fluid reservoir or to take the wheel off and inspect the pad.
How long do rear brake pads last?
Rear brake pads last longer than front pads because they're having to deal with less kinetic energy; there tends to be less weight over the rear axle and the rear brake discs on most cars are smaller than the front discs. As a result, you can expect the pads to last an average of 65,000-95,000km on cars such as a Holden Barina or Mini. On heavier, larger cars, such as a BMW 7 Series or a Toyota Land Cruiser, you may be lucky to get 40,000km out of the rear pads.
It’s important that your rear brake pads are examined whenever the car is serviced and replaced when necessary.
Always check the rest of the brake system when replacing the pads - if the discs are in a poor condition consider replacing them.
All cars are slightly different, so if it is time to change your rear brake pads, use our before you begin checklist, and find your car for specific instructions.
How to change your rear brake pads
Watch this video to see how it's done
A very brief summary of the task:
- Support the car on axle stands and remove the wheel
- Slacken and detach the handbrake cables from the brake calipers
- Remove the guide pin bolts and remove the caliper, supporting it via the suspension
- Remove the inner and outer brake pads and examine the disc and brake line(s)
- Retract the pistons into each caliper bore
- Insert the new pads and replace the caliper and any necessary clips. Check the brake fluid
- Reconnect the handbrake cables and adjust the handbrake
Why you should change your rear brake pads
Brake pads are critical components for the safe operation of your car, and should be maintained correctly to avoid a potential disaster. If the pads wear down completely you’ll not only be unable to stop the car in time but you’ll damage the discs, which will need to be replaced.
Each wheel has at least two pads and it’s important to change the pads on both rear wheels at the same time, to ensure an even brake force. At the same time you should examine the discs and skim or replace them if needed.
Tools you will need
Only basic tools are required for this job, although you’ll also need a C-clamp or piston retraction tool and you’ll need to raise the car to work on one wheel at a time.
- Brake system cleaner aerosol
- Floor jack (if necessary). Not your car’s emergency jack
- Flat-bladed screwdriver
- Allen key set
- G-clamp or piston retraction tool
- Wire brush
- Ruler to measure pad thickness
- Ratchet and socket set
- Torque wrench
Parts you may need
- Brake pads
- Pad clips/springs
- Copper grease
- Caliper guide pin bolts
- New caliper (only if faulty)
- New discs (only if worn to minimum tolerances)
How much do new brake pads cost?
|Garage fee savings||$180-$550|