The Used Car Tyre, Brake and Suspension Check: Spot £1,000 of Hidden Wear Before You Buy

You’ve found a tidy-looking hatchback, the paint is shiny, the owner has a folder of receipts, and the engine starts on the button. Then you drive it home and within three months you’re £900 lighter on tyres, discs and a pair of drop links.

It happens constantly, and it’s almost always avoidable. Tyres, brakes and suspension are the first bills any used car throws at you — before cambelts, before clutches, before anything that lights up a dashboard. The good news is that all three are visible from the outside, with no tools beyond a torch, a 20p coin and your hands.

Here’s how to spend fifteen minutes at a viewing and find the wear that would otherwise become your problem.

Why these three come first (and engine codes come later)

Fault codes need a reader. Tyres need eyes. If a car has pending engine faults, the seller usually knows and prices it in. Worn consumables are different — they creep up gradually, the owner stops noticing, and the MOT tester writes an advisory that nobody acts on.

An MOT pass only means the car met the minimum on the day. A tyre at 1.7mm passes. A disc at 0.1mm above minimum thickness passes. Neither will last you six months.

Rough maths for a typical family hatchback in a neglected state:

• Four mid-range tyres at 2.5mm: £360–£520 fitted
• Front discs and pads: £200–£400
• Rear discs and pads with an electronic parking brake: £250–£450
• Front dampers, pair fitted: £300–£550

That’s comfortably past £1,000, and none of it appears on a fault-code scan.

The tyre check

Tread depth

Legal minimum in the UK is 1.6mm across the central three-quarters of the tread, around the whole circumference. Three points and up to £2,500 per illegal tyre, so it isn’t a trivial thing to overlook.

Forget the legal figure for a moment. Grip in the wet falls off a cliff below 3mm, so treat anything under 3mm as a near-term cost.

No gauge? Use a 20p coin. Push it into the main grooves — the outer band of the coin represents roughly 1.6mm. If the band disappears into the tread, you’re legal. If you can still see it, you’re not.

A proper tread depth gauge costs about £5 and lives in the glovebox. Worth having.

Uneven wear tells a story

Run your palm across each tyre and look along the tread from a low angle:

• Worn on the inner edge only — alignment or camber is out. New tyres will scrub out the same way unless you get a four-wheel alignment (£40–£80).
• Worn in the centre — long-term over-inflation.
• Worn on both outer edges — chronic under-inflation.
• Feathered or sawtoothed blocks — worn suspension bushes or drop links, letting the wheel move under load.
• Flat spots — a hard ABS stop or a sticking brake caliper.

Also check the sidewalls for cracks, bulges and kerb scuffs, and look at the four-digit date code stamped on every sidewall (the last four digits of the DOT number). 3219 means week 32 of 2019. Tyres over six years old should be inspected closely, and most makers recommend replacing at ten regardless of tread.

Mismatched brands across an axle is a small red flag. Four different budget tyres on a car with kerbed alloy wheels tells you a lot about how it’s been treated.

The brake check

The disc lip

Crouch by each wheel and peer through the spokes. Then — carefully, discs get hot — run a fingertip from the shiny face of the disc outwards to the very edge.

If there’s a raised ridge or lip, the disc has worn down and is approaching its minimum thickness. Every disc has a minimum thickness stamped on the centre hat, though you’ll rarely be able to read it at a viewing. A lip you can feel with a fingernail is a sign the discs are near the end of their life.

Other things to look for:

• Deep concentric scoring across the face — pads run to metal at some point.
• A blue or purple tinge — the brakes have been cooked. Warped, heat-cycled discs need replacing.
• Heavy rust on the inner face with a shiny outer face — a sticking caliper, common on cars that sit for weeks. A replacement caliper is £120–£200 plus fitting.

Pad thickness

You can usually see the pad through the gap between the disc and the caliper. Friction material should be at least 3mm; below 2mm means replacement is imminent. Also check that the inner and outer pads on the same wheel are wearing evenly — an uneven pair points at a sticking caliper or a seized slider pin.

Many cars have a wear indicator that squeals. If the seller says “the brakes squeak a bit when cold”, assume pads.

Indicative costs per axle: pads only, £100–£180; discs and pads, £200–£400 front; £250–£450 rear on cars with an electronic parking brake that needs releasing with a diagnostic tool.

The suspension check

The bounce test

With the car on level ground, press down hard on each corner of the bodywork and let go. The car should rise, settle once and stop moving.

If it carries on bobbing for two or three more cycles, the dampers are worn. It’s not an MOT failure unless they’re actually leaking, but it’s a real cost and it makes the car feel horrible on a motorway.

While you’re down there, shine a torch behind each wheel and look at the damper body for oil misting or wet patches. A light mist is acceptable; a damp, oily, dirt-attracting streak means a leaking shock.

Look through the wheel arch at the base of each spring too. Broken coil springs almost always snap on the bottom coil, and a fresh break is easy to spot.

Test-drive noises

The drive is where suspension reveals itself. Windows down, radio off, and take it over a few speed bumps and some rough tarmac:

• A dull clonk over bumps — anti-roll bar bushes or drop links. Parts are cheap (£30–£80 a pair), fitted £60–£120.
• A knock through the steering at low speed — top mounts or wishbone bushes.
• A rumble that builds with speed and changes when you corner left or right — wheel bearing, £150–£300 fitted.
• Vibration through the wheel or floor at 60–70mph — wheel balance first, but a buckled wheel or bearing is possible.
• The car pulling to one side under braking — a sticking caliper or uneven pads.

Read the MOT history before you even set off

The government’s free MOT history service at gov.uk shows every test, every advisory, and every mileage reading since 2005. Do this before travelling to view.

Advisory wording to watch for:

• “Tyre worn close to legal limit” — on more than one year’s test, it means nobody replaced them.
• “Brake disc worn, pitted or scored, but not seriously weakened” — discs are on the way out.
• “Shock absorber has a slight misting of oil” — early damper wear.
• “Suspension component corroded but not seriously weakened” — check again next year; corrosion only goes one way.

The killer detail is repeat advisories. The same worn tyre or scored disc appearing on two or three consecutive MOTs means the owner was told and chose not to act. That car has been run to a budget.

Your pre-purchase checklist

• Tread depth on all four tyres, plus the spare or repair kit
• Uneven wear patterns and any sidewall cracks or bulges
• Tyre date codes — anything over six years old
• Disc lips felt by fingertip, and scoring or blueing on the faces
• Pad thickness visible through the caliper gaps
• Bounce test on all four corners
• Oil misting on damper bodies, broken spring coils
• Brake fluid and coolant levels, plus any warning lights
• MOT history read in full, including advisories and mileage consistency
• A 15-minute test drive covering bumps, corners and a fast dual carriageway

Turning what you find into money

Don’t launch into a lecture. Most private sellers know the car needs tyres or brakes and have priced it accordingly — you’re simply confirming it.

A calm, specific approach works far better than haggling: “The front discs have a lip and two tyres are at 2.5mm, which is about £600 to sort. Would you take £500 off?” You’re not inventing a problem, you’re quoting one.

Some sellers will have the work done instead. Insist on receipts if they do.

Walk-away triggers: cracked or bulging sidewalls, grinding metal on metal under braking, dampers so tired the car wallows over crests, and a pattern of ignored advisories year after year. Any of those, combined with an owner who shrugs, tells you the rest of the car has been neglected too — and the next bill will be bigger.

When you’re ready to make the change, it’s worth knowing that cars listed on UpCars.uk are checked over properly before they go up, so the basics like tyres and brakes have already had a proper look — which takes some of the guesswork out of your viewing.