How Suspension Is Checked in an MOT

How the MOT Checks Your Suspension

The MOT gives your suspension a thorough check, since worn suspension affects how the car rides, handles and stops. The tester inspects the shock absorbers, springs, bushes, ball joints and wheel bearings for wear, damage and security. Suspension is one of the more common areas for a car to fail.

The reason it matters so much is that suspension keeps the tyres in proper contact with the road. Worn parts let the car wallow, bounce or pull, which lengthens stopping distances and unsettles the car in corners. That is why the test treats suspension as a safety item rather than just a comfort one. Our guide on What an MOT Checks lists everything a tester inspects.

Because suspension parts wear gradually, a fault can creep up without the driver really noticing. Knowing the parts involved and the signs of wear helps you catch a problem before it turns into a fail or a bigger repair.

What the Tester Looks At

Suspension is made up of several parts that wear at different rates. The table below sets out the main ones and what can go wrong.

Any of these can fail the test if they are worn or damaged enough to be unsafe. A leaking shock absorber and a worn ball joint are among the most common. Our guide on Brakes and the MOT explains how brakes are tested, which works closely with the suspension for safe stopping.

How Suspension Is Inspected

Most of the suspension check is done with the car raised so the tester can see and reach each part. The tester moves the components by hand to feel for play or wear and looks for splits, leaks and corrosion.

Shock absorbers may be checked for leaks and with a bounce test, pressing down on each corner to see how quickly the car settles. Some centres also use a plate that shakes each wheel while the car is on the ramp, which reveals worn joints and bushes as movement. Together these methods build a clear picture of the suspension's condition. Our guide on Top Reasons Cars Fail MOT covers the other big failure areas.

Spotting Worn Suspension Early

Suspension usually gives warning signs before it fails a test, so paying attention to how the car feels can save a failure. Knocks or rattles over bumps, a ride that feels bouncy or floaty and the car leaning heavily in corners can all point to wear.

Uneven tyre wear is another clue, since worn suspension can stop the tyres meeting the road evenly. If you notice any of these, it is worth having the suspension checked before your MOT rather than risking a fail. Catching a worn part early is often cheaper than leaving it to wear others out with it.

How Suspension Affects Safety

It is easy to think of suspension as being about comfort, though its real job is safety. The suspension keeps each tyre pressed onto the road so the car can steer, grip and brake properly. When a part is worn, the tyre can lose contact with the surface over bumps, which lengthens stopping distances and makes the car harder to control.

This is why a worn shock absorber or ball joint is treated as a genuine safety fault rather than a minor niggle. It also ties into other parts of the test, since tired suspension can wear tyres unevenly and upset how the brakes perform. Keeping the suspension in good order helps the whole car pass and, more importantly, keeps it safe to drive. Our guide on Brakes and the MOT explains how tyres are checked alongside it.

Keep Your Suspension MOT Ready

This guide is part of our full MOT Guides hub, where the testing, cost and rules articles sit together so you can move to the exact detail you need next. When it is time to book, our team offers full MOT testing and repairs from our centre in Ely. You may also find it useful to read What an MOT Checks, Brakes and the MOT and Top Reasons Cars Fail MOT.

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