When to Replace Brake Pads and Discs

How Long Should Brake Pads Last?

There is no single number, and anyone who quotes you one is guessing. As a rough guide, front pads on a typical family car last somewhere between 25,000 and 35,000 miles, while rear pads often stretch to 50,000 miles or more. Fronts wear faster because they do roughly two-thirds of the stopping work as weight shifts forward under braking.

What matters more than mileage is how you drive. A car that spends its life in stop-start town traffic, on hilly routes, or towing a caravan will chew through pads far quicker than one cruising up and down a motorway. If you have covered 30,000 miles and have never had your brakes looked at, book a check — it costs very little and takes minutes.

The Signs That Mean Replacement Is Due

Brakes rarely fail without warning. They grumble, squeal and shudder long before they give up. Learn what your car is telling you:

• A high-pitched squeal that stops when you press the pedal. Most pads have a small metal wear indicator that touches the disc once the friction material gets thin. That squeal is deliberate — it is your last comfortable warning.
• Grinding, like metal scraping metal. You have run out of friction material and the backing plate is now cutting into the disc. Stop driving and get it recovered to a garage. Continuing causes expensive damage.
• A soft, spongy pedal or one that sinks towards the floor. This usually points to air or a leak in the hydraulic system, or worn brake fluid, rather than the pads themselves. Treat it as urgent.
• Pulsing or vibration through the pedal. Often a sign of uneven disc wear, warping or pad deposits, rather than worn pads alone.
• The car pulls to one side when braking. A sticking caliper or unevenly worn pads on one side. Worth investigating promptly.
• Longer stopping distances, or a brake warning light on the dash. On some cars the light simply means the fluid is low; on others it flags a sensor.

You can also check visually. Look through the gaps in your alloy wheels with a torch. If the friction material is thinner than about 3mm — roughly the thickness of a pound coin — book replacement. Bear in mind that the inner pad on each wheel often wears faster than the outer one, so what you can see is not always the full story.

Don't Forget The Discs

Pads are consumable, and so are discs — they wear thin, corrode and distort. Every disc has a minimum thickness stamped on its edge or hub. Once it is reached, replacement is the only safe option.

Signs a disc is past its best include deep scoring, a pronounced lip around the outer edge, blue or purple heat spots, and fine cracks radiating out from drilled holes. A disc can also warp, which shows up as a pulsing pedal. Skimming a disc is possible if plenty of metal remains, but on a modern car it is often cheaper and better to fit new ones.

As a rule, fit new pads and discs together. New pads bed in best against a clean, flat surface, and mixing new pads with tired discs gives you less stopping power and more noise. While the wheels are off, it is also worth asking about your brake fluid — most manufacturers recommend changing it every two years, regardless of mileage.

What Wears Brakes Out Faster Than You'd Expect

• Sticking calipers and corroded slider pins. Especially common on rear brakes, which do less work and seize more often.
• Riding the brakes downhill instead of dropping a gear and using engine braking.
• Heavy loads, caravans and roof boxes — extra weight means extra heat and wear.
• Stop-start traffic, which never lets the brakes cool properly.
• Long periods standing idle. Rust builds on discs, and a pitted surface eats pads quickly once you drive again.
• Budget pads. Cheap friction material can be noisy, dusty and short-lived.

What Replacement Involves — and What It Costs

Prices are usually quoted per axle, so front and rear are billed separately. As a broad guide, pads alone typically cost £120 to £250 fitted per axle, while pads and discs together usually land between £250 and £450 an axle. Parts on their own run to around £25 to £60 for a set of pads and £50 to £120 for a pair of discs. Main dealers charge more than independent garages.

Always ask for the measured thickness of the old pads, and for the minimum thickness figure on the discs. Any decent garage will be happy to show you. Once the work is done, bed the new pads in: for the first 200 miles or so, brake gently and progressively, avoid emergency stops, and try not to sit with your foot hard on the pedal at traffic lights straight after heavy braking. That last habit bakes pad material onto the disc and causes judder.

A Five-Minute Check You Can Do This Weekend

Park on level ground, apply the handbrake, and have a look through the wheel spokes with a torch. Check both the front and rear, and compare left with right — uneven wear is a clue that something else needs attention. Top up nothing unless you know what you are doing, but do check the fluid level in the reservoir against the markings on the side.

If anything looks borderline, most garages offer a free or low-cost brake inspection. Brakes are the one system where "I'll deal with it at the MOT" is a genuinely bad plan. Sort them early and you will spend less, stop shorter, and hear a lot less squealing.