MOT Wipers: Front vs. Rear – A Full Guide

It's a common worry for many motorists as MOT test day approaches: what exactly gets checked, and what could lead to a dreaded 'fail'? Your query regarding your girlfriend's Polo and its rear washer jet is a perfect example of this uncertainty. Let's delve into the specifics of windscreen wipers and washers in the context of the UK's annual MOT test to clarify things.

The simple answer to your immediate question about the Polo's rear washer jet is that, for most passenger cars, a non-functioning rear wiper or washer jet is not an MOT failure. The MOT test primarily focuses on the safety and roadworthiness of the vehicle, particularly aspects that affect the driver's ability to see the road ahead and behind effectively, and to control the vehicle safely. While a fully functional rear washer and wiper are certainly beneficial for clear rear visibility, they are generally not considered a mandatory testable item for standard passenger vehicles.

The MOT Test: A Focus on Roadworthiness

The MOT (Ministry of Transport) test is an annual inspection of vehicles over three years old in the UK, designed to ensure they meet minimum road safety and environmental standards. It's not a check of the vehicle's general mechanical condition, but rather a snapshot of its roadworthiness at the time of the test. Items like brakes, steering, lights, tyres, seatbelts, and of course, visibility through the windscreen, are all under scrutiny.

Front Windscreen Wipers and Washers: Non-Negotiable Visibility

When it comes to the front of your car, the requirements for wipers and washers are stringent. This is because clear forward visibility is absolutely paramount for safe driving. Without it, your ability to react to hazards, read road signs, and maintain control is severely compromised, especially in adverse weather conditions.

What the MOT Tester Checks for Front Wipers:

• Condition of Blades: The wiper blades must be in good condition, free from tears, splits, or perishing. They must effectively clear the windscreen without smearing or leaving streaks that impair the driver's view. A wiper blade that leaves a significant uncleared area or causes excessive smearing will result in a fail.
• Operation: Both front wipers must operate correctly and at all speeds (if multiple speeds are available). They must sweep a wide enough area to provide the driver with an adequate view of the road.
• Attachment: The wipers must be securely attached to the vehicle.

What the MOT Tester Checks for Front Washers:

• Fluid Level: There must be sufficient washer fluid in the reservoir to enable the system to operate. If the reservoir is empty, it's an immediate fail.
• Spray Pattern: The washer jets must spray fluid onto the windscreen in a way that allows the wipers to clear the screen effectively. A weak spray, a jet that sprays off the screen, or a blocked jet will lead to a fail.
• Operation: The washer system must activate when the control is operated.

Essentially, if your front wipers or washers fail to provide a clear view of the road through the swept area of the windscreen, your car will fail its MOT. This is a critical safety component, and testers are very thorough in this area.

The Rear View: Do Rear Wipers Matter for MOT?

This is where the distinction becomes crucial and addresses your specific concern. For the vast majority of passenger cars, including your girlfriend's Polo, the rear wiper and washer system are not a testable item for the MOT. This means:

• A broken or missing rear wiper blade will not cause an MOT failure.
• A non-functioning rear washer jet will not cause an MOT failure.
• An empty rear washer fluid reservoir (if separate from the front) will not cause an MOT failure.

The reasoning behind this is that for most cars, side mirrors and the interior rear-view mirror provide the primary means of rearward visibility. While a clear rear window is helpful, it's not deemed as essential for basic road safety as a clear front windscreen. However, there's a very important caveat:

Exceptions Where Rear Wipers Might Matter:

There are specific types of vehicles where a rear wiper/washer *could* become an MOT failure. This typically applies to vehicles where the rear window provides the *only* means of rearward observation, and there are no side mirrors fitted (or if they are obscured). This is extremely rare for passenger cars and more commonly applies to certain commercial vehicles, like some vans without rear side windows or external mirrors. If a vehicle is designed such that the rear window is the sole means of rear visibility, then its wiper and washer system would be part of the MOT test. For a standard Polo, this is not the case.

Beyond Wipers: Other Visibility Checks at the MOT

While we're on the subject of visibility, it's worth noting other components that affect a driver's view and are part of the MOT test:

• Windscreen Condition: The windscreen must be free from damage that significantly impairs the driver's view. Chips or cracks larger than 10mm in the 'swept area' (the part cleared by the wipers) directly in front of the driver, or larger than 40mm elsewhere on the windscreen, will result in a fail.
• Mirrors: All mandatory mirrors (interior and exterior) must be present, secure, and provide an adequate view. Missing, cracked, or excessively damaged mirrors will fail.
• Lights: All lights (headlights, brake lights, indicators, rear lights, fog lights where fitted) must be present, working correctly, and emitting the correct colour and intensity of light. This is crucial for both the driver to see and be seen.
• Horn: The horn must work and emit a continuous, uniform sound.

Common MOT Failures Related to Visibility

Here's a quick overview of common visibility-related issues that lead to MOT failures, helping you perform a pre-test check:

• Wiper Blades: Perished, torn, or ineffective blades (front only).
• Washer System: Empty fluid reservoir, blocked jets, or non-functioning pump (front only).
• Windscreen Damage: Chips or cracks in critical areas.
• Lights: Blown bulbs, incorrect colours, or misaligned headlights.
• Mirrors: Missing or broken mirrors.

Pre-MOT Checks You Can Do

Before taking your car for its MOT, it's always a good idea to perform some basic checks yourself. This can save you time, hassle, and the cost of a retest. For wipers and washers:

1. Front Wipers: Turn them on and observe. Do they clear the screen effectively? Are there any streaks or unwiped areas? Check the blades for splits or perishing.
2. Front Washers: Activate them. Is there plenty of fluid? Does the spray hit the screen effectively? Do the wipers then clear the screen?
3. Windscreen: Inspect for chips or cracks, particularly in the driver's line of sight.
4. Lights: Turn on all lights (headlights on dipped and main beam, indicators, hazards, brake lights, fog lights). Walk around the car to ensure all are working. Get someone to help you check the brake lights.
5. Tyres: Check tread depth (minimum 1.6mm across the central three-quarters of the tread around the entire circumference) and for any bulges or cuts.
6. Fluid Levels: Check engine oil, coolant, brake fluid, and power steering fluid. While not all are MOT items, low levels can indicate underlying issues.

Why Maintain Your Wipers, Even the Rear One?

Even though your Polo's rear washer jet won't cause an MOT fail, it's still good practice to maintain all components of your vehicle. A clear rear window significantly enhances safety, especially when reversing or changing lanes. It provides a more complete picture of your surroundings, reducing blind spots and improving your awareness of other road users. Regularly checking and topping up all fluid levels, including washer fluid, is part of good vehicle maintenance and contributes to a safer and more pleasant driving experience.

Comparative Table: Front vs. Rear Wiper MOT Requirements

Frequently Asked Questions (FAQs)

Q1: Is a broken rear wiper an MOT failure?

No, for the vast majority of passenger cars, a broken or non-functioning rear wiper or washer jet is not an MOT failure. The focus is on front visibility.

Q2: What if my car doesn't have a rear wiper at all?

If your car was manufactured without a rear wiper (as many saloons or coupes are), then it cannot be failed for not having one. The MOT only checks what the vehicle was originally fitted with and if it meets current safety standards.

Q3: How often should I replace my wiper blades?

It's generally recommended to replace front wiper blades every 6-12 months, or as soon as you notice them smearing, chattering, or not clearing the screen effectively. Rear wipers can often last longer due to less frequent use, but should still be replaced when they become ineffective.

Q4: What constitutes a 'poor' wiper blade for MOT?

A poor wiper blade for MOT purposes is one that leaves significant smears, streaks, or unwiped areas in the driver's swept vision area, or if the blade rubber is torn, split, or perished to the extent that it cannot clear the screen effectively. Any of these will lead to a failure.

Q5: Are headlamp washers checked during the MOT?

No, headlamp washers are not part of the MOT test. While they are useful for maintaining headlight clarity, their functionality does not impact the test outcome.

Q6: Will a completely empty washer fluid reservoir fail the MOT?

Yes, if the front washer fluid reservoir is empty, it will result in an MOT failure. The system must be operational and have fluid to spray onto the windscreen.

Conclusion

So, you can rest easy regarding your girlfriend's Polo. A faulty rear washer jet will not cause it to fail its MOT. The critical focus of the test regarding wipers and washers is squarely on the front of the vehicle, ensuring the driver has unimpaired forward visibility. While it's always advisable to repair any faults on your vehicle for overall safety and convenience, this particular issue won't stand in the way of an MOT pass. Always ensure your front wipers and washer system are in perfect working order, and you'll significantly increase your chances of a smooth MOT pass.

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