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MOT Failures Guide · Suspension

Suspension MOT Failures

Suspension failures are among the most complex and expensive MOT failures. Worn bushes, failed dampers, corroded subframes — problems that develop gradually but can make a car genuinely unsafe. Here is exactly how the MOT tests suspension and what causes failures.

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Suspension MOT Failures

Quick Answer

Suspension and steering failures account for 9–11% of all MOT failures. The most common are: worn or cracked rubber bushes in wishbones and anti-roll bar links, failed shock absorbers that no longer control body movement, corroded coil springs, and worn ball joints with measurable play. These problems rarely arrive without warning — look for clunking over bumps and uneven tyre wear.

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What it costs

Suspension MOT Failure Causes & Repair Costs

Failure itemDefect typeTypical UK repair costBoth sides?
Wishbone/control arm bush wornMajor£80–£200 per armUsually paired
Front shock absorber failedMajor£80–£200 per sideAlways replace in pairs
Rear shock absorber failedMajor£70–£180 per sideAlways replace in pairs
Coil spring cracked/brokenDangerous£80–£180 per springUsually paired
Ball joint worn — excessive playMajor/Dangerous£100–£250 per jointOften paired
Anti-roll bar bush wornAdvisory/Major£40–£100 per sideUsually paired
Anti-roll bar drop link wornAdvisory/Major£30–£80 per sideUsually paired
Steering rack worn — excessive playMajor£250–£600Single unit
Subframe mounting corrodedMajor/Dangerous£400–£1,500+N/A
CV joint gaiter splitAdvisory£50–£150Check both sides

Costs are UK independent garage estimates, 2026. Premium vehicles cost significantly more.

The six-step process

How the MOT Tests Suspension

Most MOT test centres use a suspension tester — a plate that oscillates under each wheel. This applies controlled movement and reveals any play or looseness in bushes, joints, and bearings that would be difficult to detect visually. The process is methodical:

01

Ramp visual inspection

With the car on a lift, the tester visually inspects all suspension components for corrosion, leaks from dampers, cracked rubber bushes, and condition of spring coils.

02

Wheel shake test

The tester grabs the top and bottom of each wheel to check for bearing play, and then at 9 and 3 o'clock to check for ball joint and steering play.

03

Suspension plate test

Each wheel is placed on the oscillating plate. The plate moves the wheel in different directions while the tester observes the suspension components for excessive movement.

04

Steering lock test

The steering is turned to full lock in both directions. The tester checks for CV joint clicking, steering geometry, and rubbing of any components.

05

Damper bounce test

In the absence of dedicated equipment, the tester may press down on each corner of the car and release — the body should not bounce more than once or twice before settling.

06

Subframe and mounting check

On older vehicles especially, the tester inspects subframe mounting points and jacking points for corrosion that compromises structural integrity.

Don't ignore these

Warning Signs to Check Before Your MOT

Clunking or knocking over speed bumps and rough surfaces — likely worn bushes or drop links
Squeaking from front suspension over slow-speed undulations — usually dry or worn bushes
Car bouncing excessively after hitting a bump — failed shock absorbers
Heavy rolling in corners — anti-roll bar bushes or links worn, or soft dampers
Uneven tyre wear — inner or outer edge much more worn than centre — geometry or worn joints
Car sitting noticeably lower on one corner than others — broken coil spring
Steering wheel feels vague or has noticeable free play before the wheels respond — steering rack
Clicking or grinding from front wheels when turning — CV joint failure
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Questions & answers

Frequently Asked Questions

What suspension problems cause an MOT failure?
The most common suspension failures are: worn or collapsed suspension arm bushes allowing excessive movement, failed shock absorbers (dampers) that cannot control body movement, corroded or cracked coil springs, worn ball joints with excessive play, steering rack wear causing play, and heavily corroded subframe mounting points. Suspension failures account for approximately 9–11% of all MOT failures.
How is suspension tested at the MOT?
The tester uses a 'shake plate' or suspension testing machine that oscillates the wheel to reveal play in joints and bushes. They also perform a visual inspection on a ramp, checking for corrosion, leaks from dampers, cracked springs, and worn boots on ball joints and CV joints. Steering geometry and play are checked with the steering at full lock.
How much does it cost to fix suspension for an MOT?
Costs vary enormously by vehicle and specific component. Wishbone bush replacement: £80–£200. Front shock absorber replacement (pair): £150–£350. Coil spring replacement (pair): £100–£280. Ball joint replacement: £100–£250. Complete front suspension overhaul on a high-mileage car: £500–£1,200. German vehicles cost significantly more — a BMW or Audi suspension overhaul can reach £1,500–£2,500.
Can suspension bushes be advisory rather than a failure?
Yes. The tester assesses the degree of wear. Slight deterioration of a rubber bush may result in an advisory; significant play that affects handling will be a Major failure. Advisories on suspension bushes mean 'monitor this — it is on its way out.' On a car you're buying, a suspension bush advisory on multiple consecutive MOT tests means it was never repaired.
How do I know if my suspension is going to fail the MOT?
Warning signs include: knocking or clunking noises over bumps, the car bouncing excessively after hitting a pothole, the car leaning or rolling heavily in corners, uneven tyre wear (a key sign of geometry or bush problems), the steering wheel feeling vague or having play, and the car sitting lower on one side than the other (collapsed spring or damper).
What is a subframe corrosion failure?
The subframe is the metal structure that carries the suspension and engine in many front-wheel-drive cars. If the mounting points where the subframe bolts to the bodyshell are severely corroded, the joint loses its structural integrity. This is a dangerous failure — a severely corroded subframe mount can cause the suspension to collapse under load. Repair requires welding and is expensive: £400–£1,500+ depending on severity.
Can I drive with a suspension advisory?
Legally yes — an advisory means the component is worn but still within MOT limits. However, you should repair it before the next MOT, as advisories often become Major failures if left. If you notice clunking over bumps, heavy rolling in corners, or uneven tyre wear, get the suspension inspected immediately rather than waiting for the MOT.
Are suspension problems expensive to fix?
It depends on the component. Anti-roll bar drop links are cheap (£30–£80 per side). Wishbone bushes cost £80–£200 per arm. Shock absorbers cost £150–£350 per pair. The expensive items are steering racks (£250–£600) and subframe repairs (£400–£1,500+). German premium brands cost significantly more — a BMW or Audi suspension overhaul can reach £1,500–£2,500.
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SR

Ste Robinson

Founder, MotR · Last reviewed 12 June 2026

Ste Robinson is the founder of MotR, helping UK drivers check MOT history, tax status, vehicle records and ownership information using official DVLA and DVSA data.

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Suspension MOT standards sourced from the DVSA MOT Inspection Manual. Repair costs are UK independent garage estimates, 2026. Premium vehicles cost significantly more.

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