DIY MOT Checks: Save Your Suspension (and Cash!)

The annual MOT test can be a source of significant anxiety for many drivers across the UK. Will your beloved vehicle pass with flying colours, or will it be slapped with a dreaded 'fail' certificate, leaving you grounded and out of pocket? The good news is, a simple, proactive approach with a few easy home checks can dramatically increase your chances of passing, saving you both time and a considerable amount of money. One expert suggests a particularly straightforward method that can quickly reveal a major problem often overlooked: your car's suspension.

Why Your Suspension Matters for Your MOT

Your car's suspension system is far more than just a comfort feature; it's a critical safety component. It connects your vehicle to its wheels, allowing them to move independently over bumps and dips while keeping the tyres firmly on the road. A healthy suspension system ensures stable handling, effective braking, and overall vehicle control. During an MOT test, examiners pay close attention to the condition of your shock absorbers, springs, and other suspension components. Any significant wear or damage can lead to a failure, as it compromises the vehicle's safety and roadworthiness.

A failed MOT effectively renders your vehicle illegal to drive, except for the journey back to the garage for repairs and then to a retest centre. Identifying and rectifying issues beforehand means you avoid this stressful situation, not to mention the potential retest fees and the inconvenience of being without your car.

The Simple 'Bounce Test' Explained

According to motoring expert Warren Edwards, a national car buying manager at Money4YourMotors, one of the easiest ways to check your suspension at home requires no special tools – just your own weight. It’s called the 'bounce test'.

Here’s how to perform it:

1. Park your car on a level surface.
2. Go to one corner of your vehicle, for example, above the front wheel.
3. Lean your weight heavily onto the car's bonnet or boot, pushing down firmly.
4. Release your weight quickly and observe how the car reacts.

A healthy suspension system should cause the car to bounce down once and then immediately return to its original position, perhaps with one small, controlled rebound. Warren stresses, "Your car should do no more than three bounces, so any more and you may need to take it to your local garage." If your car continues to bounce excessively, sways, or feels 'floaty' after you release your weight, it's a strong indicator that your shock absorbers or springs are worn and need attention. This simple bounce test can be performed on all four corners of the vehicle to get a comprehensive understanding of your suspension's health.

Other DIY Checks to Ace Your MOT

While the bounce test is excellent for suspension, a comprehensive Pre-MOT Check at home involves looking at several other key areas. These simple visual and functional checks can save you from common MOT failures:

Lights and Indicators

• Check all exterior lights: headlights (full beam and dipped), sidelights, brake lights (get someone to help or use a reflection), fog lights, and reverse lights.
• Ensure all indicators flash correctly and at the right speed.
• Don't forget the number plate lights!

Tyres

• Check tyre pressure using a reliable gauge. Incorrect pressure affects handling and fuel economy.
• Examine tyre tread depth. The legal minimum is 1.6mm across the central three-quarters of the tread around the entire circumference. Many tyres have wear indicators built into the grooves.
• Look for any cuts, bulges, or cracks on the tyre sidewalls.

Brakes

• Listen for any grinding or squealing noises when braking.
• Check the handbrake: it should hold the car firmly on a slope without excessive travel.
• Look for any brake fluid leaks around the wheels.
• If your brake warning light is on, get it checked immediately.

Wipers and Washers

• Ensure your wipers clear the windscreen effectively without streaking.
• Top up your washer fluid and check that the jets spray correctly onto the windscreen.

Fluid Levels

• Check engine oil, coolant, brake fluid, and power steering fluid levels. Low levels can indicate leaks or neglect.

Horn

• Give your horn a quick blast to ensure it works and is loud enough.

By conducting these basic checks, you can identify many potential issues that would lead to an MOT failure, giving you time to get them rectified before your official test.

Understanding Shock Absorber Costs

If your bounce test indicates an issue with your shock absorbers, it's important to be prepared for the potential repair costs. According to BookMyGarage, a leading car service and repairs comparison site, replacing a shock absorber can be a significant expense for motorists. They estimate the work to cost between £350 and £400, though prices can range widely from £200 to £600 depending on your vehicle's make and model, the garage you choose, and your location. Prices might be slightly higher if the vehicle's entire suspension mounts also need replacement.

Here’s a rough breakdown of potential costs:

While these costs might seem daunting, remember that addressing these issues promptly can prevent more expensive damage down the line and, crucially, ensure your car is safe and legal to drive.

Regional Road Conditions and MOT Failures

Interestingly, geographical factors can play a role in MOT failure rates related to suspension. Money4YourMotors highlights that MOT failures due to underperforming shock absorbers are more prevalent in Oxfordshire. Government data indicates that 8.6 percent of MOT failures in Oxfordshire are linked to shock absorbers, compared to a national average of 7.4 percent. This suggests a clear connection between the condition of local roads and vehicle suspension issues in specific areas. Almost 30,000 MOT tests in Oxfordshire recently flagged problems with shock absorbers. This serves as a stark reminder that drivers in areas with poorer road surfaces should be particularly vigilant about their suspension health.

What Happens If You Fail Your MOT?

Receiving an MOT fail certificate can be disheartening. If your car fails, it means it has one or more 'dangerous' or 'major' defects. You are legally not allowed to drive the vehicle on public roads until these defects are repaired and the car passes a retest. The only exception is driving to a pre-booked appointment for repairs or to an MOT retest centre. Driving a vehicle with a failed MOT can lead to fines, points on your licence, and potentially invalidate your insurance.

Minor defects, while not leading to a fail, are advisory and should be addressed soon. They indicate components that are wearing and will likely become a major defect in the future.

Proactive Maintenance: Saving Time and Money

The message is clear: prevention is better than cure. By incorporating these simple Pre-MOT Check routines into your car maintenance schedule, you empower yourself to identify potential problems early. This proactive approach allows you to get repairs done on your own terms, potentially shopping around for better prices or planning for the expense, rather than being forced into urgent repairs after a failed MOT. It reduces stress, saves money, and most importantly, ensures your vehicle remains safe and roadworthy for you and other road users.

Frequently Asked Questions (FAQs)

How often should I check my suspension?

It's advisable to perform the bounce test and other basic suspension checks at least every six months, or if you notice any changes in your car's handling, such as excessive bounciness, swaying, or nose-diving during braking.

Can I replace shock absorbers myself?

While technically possible for an experienced DIY mechanic, replacing shock absorbers can be complex and requires specialist tools, such as spring compressors. It's generally recommended to have this work performed by a qualified mechanic to ensure safety and proper installation, especially as incorrect installation can lead to dangerous handling issues.

What are the most common MOT failure points?

Beyond suspension, common MOT failure points include lighting and signalling (bulbs out, incorrect aim), tyres (insufficient tread, damage), brakes (worn pads/discs, imbalanced braking), and visibility (windscreen damage, faulty wipers).

Is the bounce test always accurate?

The bounce test is a good initial indicator of shock absorber wear, but it's not foolproof. It primarily identifies severely worn or 'dead' shocks. Other suspension issues, like worn bushings or ball joints, might not be evident from this test alone. If you suspect an issue, or if your car's handling feels off, always get a professional inspection.

What should I do if my car fails the MOT?

If your car fails, you'll receive a 'Refusal of an MOT Test Certificate' (VT30). You must get the 'major' or 'dangerous' defects repaired. You can usually leave the car at the test centre for repairs or take it elsewhere. If you take it away, remember you can only drive it to a pre-booked repair appointment or a retest. Once repaired, it will need a retest to get a valid MOT certificate.

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