Brake basics and the signs of wear
Brakes are the most important safety system on a car, and they wear out through normal use. Knowing the basics helps you notice problems early, talk sensibly to a mechanic and avoid both neglect and unnecessary repairs. This guide is about recognising signs, not about doing the work yourself: brake repairs should be left to a workshop.
How brakes work
When you press the pedal, fluid pressure pushes friction material against a metal surface that turns with the wheel. The friction slows the wheel and turns movement into heat. Most cars use discs with pads at the front, and either discs or drums with shoes at the rear. A pump and vacuum or electric assistance make the pedal easy to press, and an anti-lock system helps prevent the wheels from locking.
What wears out
- Brake pads and shoes: the friction material wears down gradually and is replaced.
- Brake discs and drums: they wear too and can become thin, uneven or damaged.
- Brake fluid: it absorbs moisture over the years and needs to be replaced on a schedule.
- Hoses and calipers: they can leak or seize with age, especially if the car stands a lot.
How fast the parts wear depends on your driving. City traffic, hills, heavy loads and hard braking use them up faster. Calm driving with gentle braking makes them last longer.
Signs the pads are worn
- A high-pitched squeal when braking, often caused by a small metal wear indicator touching the disc.
- A grinding or scraping noise. This usually means the friction material is gone and metal is rubbing on metal, which damages the discs quickly. Stop driving and book a repair.
- A brake warning light on the dashboard, on cars that have pad wear sensors.
- The pedal feeling different, or the car needing a longer distance to stop.
Some squeaks are harmless, for example from moisture on the discs after rain or a dusty surface. If a noise continues or changes, get it checked.
Other symptoms to take seriously
- Vibration through the steering wheel or pedal when braking can mean uneven or warped discs.
- The car pulling to one side may point to a seized caliper or uneven wear.
- A soft, spongy or sinking pedal can mean air or a leak in the system, or old fluid. This is urgent.
- A burning smell after driving can mean a brake is dragging.
- A hard pedal or long stopping distance may involve the brake assistance.
- Fluid under the car or a low fluid level in the reservoir.
If the pedal goes down to the floor or the brake warning light stays on, do not continue driving. Read what to do in a breakdown, and call for help.
Brake fluid
Brake fluid is not part of the level you top up casually. It absorbs water over time, which lowers its boiling point and can cause corrosion inside the system. Workshops replace it at the interval given in the service schedule, usually listed with the bigger service items in how often to service. If the level in the reservoir drops noticeably, it usually means worn pads or a leak, and the car needs inspection.
Drive in a way that saves your brakes
- Look ahead and ease off the accelerator early, so you brake less sharply.
- On long descents use a lower gear to let the engine help instead of keeping the pedal pressed.
- Avoid carrying unneeded weight.
- Electric and hybrid cars recover energy when slowing down, which often reduces pad wear, but the brakes still need checking and can corrode from lack of use.
Checking before you buy
When you test drive a used car, brake once firmly in a safe place, and note any pulling, vibration or noise. Look at the discs through the wheels if you can: a deep lip or heavy rust on the surface is a bad sign. The test drive checklist includes a brake check, and an independent inspection is better still.
Leave the work to professionals
Brake work affects your life and other people's. Do not attempt repairs without proper training and equipment, and never work under a car supported only by a jack. If you notice a problem, describe the symptoms to the workshop and ask them to show you the worn parts afterwards. Keep the invoice with your records in My Garage.
What to remember
- Pads, discs and fluid are wear items and need regular checks.
- Squealing is an early warning; grinding means act now.
- A soft pedal, pulling or a warning light is urgent.
- Brake work is for a workshop, not for home repair.
- Smooth, anticipating driving makes brakes last longer.
Strumenti per questo articolo
- Il mio garage – Il Suo libretto privato dell'auto: carburante, tagliandi, costi, scadenze.
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