Are rear mudguards needed on a car: 7 arguments for and against

Rear mud flaps are one of those car elements that drivers have been arguing about for years. Some consider them mandatory protection against corrosion and dirt, others consider them a useless accessory that only spoils the appearance. But are they really so useless? In this article we will figure out Do you need rear mudguards? from the point of view of safety, legislation and practicality, and we will also evaluate their impact on the body, suspension and ride comfort.

The debate surrounding mud flaps often boils down to two extremes: “they save your car from rust” or “they’re a waste of money.” In fact, the truth, as usual, is in the middle. We will analyze technical aspects (impact on aerodynamics, protection against stones), legal nuances (requirements of the traffic police and technical regulations), as well as practical implications — from the frequency of washing to the risk of damage to paintwork. We will pay special attention to myths: for example, that mud flaps “damage the appearance” or “increase fuel consumption.”

If you are in doubt about whether to install mud flaps on your car, this article will help you make an informed decision. We will not impose a definite answer - instead we will provide facts, comparative tests and expert opinions, so you can evaluate the pros and cons for your car model and driving style.

1. What are rear mud flaps and how do they work?

Rear mudguards (they are also called mudguards or fender liners) are plastic or rubber panels installed behind the rear wheels of a car. Their main task is intercept the flow of water, mud and small stones, which fly off from the rotating wheels. Without mudguards, all this mixture flies onto the body, suspension and oncoming cars.

Structurally, mudguards are:

• 🔹 Universal — suitable for most models, fastened with clips or self-tapping screws. Most often they are made of flexible plastic or rubber.
• 🔹 Original — developed by the manufacturer for a specific car model. Usually more expensive, but they better follow the shape of the wheel arch.
• 🔹 Sports — lightweight versions made of composite materials, used on tuned cars.

Mud flaps when driving on wet roads or gravel reduces the area of dirt spreading by 60–80% (according to tests ADAC, 2022). This means that without them, the rear of the body, headlights and windows will become dirty several times faster. In addition, mud flaps partially absorb the energy of small stones, reducing the risk of chips on the paintwork.

However, their effectiveness depends on several factors:

• 📏 Length and shape — short mud flaps offer almost no protection from splashes, and too long ones can cling to curbs.
• 🔧 Material — hard plastic reflects stones better, but can crack on impact; Rubber is flexible, but wears out faster.
• 🚗 Vehicle type — on SUVs, mudguards often come as standard, but on sports cars they may not be present at all.

2. Legal requirements: are mud flaps required according to GOST and Technical Regulations?

One of the most common myths is that mud flaps required by law, and without them you cannot pass the technical inspection. In reality the situation is ambiguous. In Russia there is no direct ban on the absence of mudguards, but there are indirect requirements that can lead to a fine.

According to Technical Regulations of the Customs Union TR CU 018/2011 (clause 4.3.1), the car should not pose a threat to other road users. This includes:

• 💦 Pollution from oncoming and passing vehicles — if your car splashes heavily on other vehicles, this may be considered a violation.
• 🪨 Ejection of stones and foreign objects - if stones fly out from under the wheels and can damage other cars, this is also a violation.

In practice, a traffic police inspector is unlikely to fine you for the lack of mudguards “just like that.” But if your car systematically pollutes other cars (for example, when driving through puddles), this may become the basis for drawing up a protocol on Part 1 Art. 12.5 Code of Administrative Offenses of the Russian Federation (“Managing a vehicle with malfunctions”). Fine - 500 rubles.

⚠️ Attention: In some European countries (such as Germany and France), the absence of mud flaps is considered an offense if the car pollutes the road or other cars. In Russia, such cases are rare, but theoretically possible.

Regarding technical inspection, then mud flaps are not included in the list of mandatory equipment (Order of the Ministry of Transport No. 272 from 2021). However, if they were installed by the manufacturer, their absence may be regarded as inconsistency of the vehicle design - but only if it is stated in the title or vehicle documentation.

Situation	Could there be a fine?	Base
There are no mudguards on a production car (where they are not provided)	❌ No	No structural violation
The mudguards that came as standard were removed.	⚠️ Perhaps	Inconsistency of design (Article 12.5 of the Administrative Code)
The car heavily splashes other cars	✅ Yes (500 rub.)	Violation of clause 4.3.1 of the Technical Regulations
Mudguards are damaged (cracks, fallen fasteners)	⚠️ Perhaps	Malfunction (Article 12.5 of the Administrative Code)

3. Effect on the body: protection against corrosion and chips

The main argument of supporters of mudguards is body corrosion protection. Let's see how justified this is.

Without mud flaps, the rear of the car is exposed to three main threats:

1. Wet mud — when driving through puddles, water with sand and salt (in winter) constantly hits the sills, arches and the bottom of the doors. This accelerates the formation of rust by 2–3 times.
2. Small stones — pebbles flying off the wheels leave microchips on the paintwork, which over time turn into pockets of corrosion.
3. Chemical reagents — in winter, salt and reagents from the roads get onto the metal, destroying the protective coating.

Research Swedish Corrosion Institute (2020) showed that cars without mudguards in northern climates (salt, temperature changes) rust at 40% fasterthan with installed shields. Particularly vulnerable:

• 🚪 Bottom edges of doors — moisture accumulates here, and corrosion begins within 2–3 years.
• 🔧 Thresholds - often rot from the inside, which is difficult to notice in the early stages.
• 🔦 Tail lights — the plastic becomes cloudy from sandblasting, and the contacts oxidize.

However, mud flaps are not a panacea. They do not protect 100%, and in some cases can even worsen the problem:

• 💧 If the shields are too short, they concentrate the flow of dirt at one point, accelerating the wear of the paintwork in this place.
• 🧲 Plastic mudguards can accumulate static charge, attracting dust and dirt to the body.
• 🔩 Incorrectly installed shields rubbing against the tire, wearing out the tread and creating noise.

⚠️ Attention: On vehicles with air suspension (for example, Mercedes S-Class or Range Rover) Mud flaps that are too long can cling to the suspension elements when the ground clearance changes. Check clearances before installation!

How to check if there is already corrosion under the paintwork?

Inspect the sills and arches from the inside (you can through the technological holes). Pay attention to blisters in the paint - this is a sign of rust under the primer layer. For an accurate diagnosis, use a thickness gauge or contact a service station with a lift.

4. Effect on suspension and wheels: pros and cons

Mud flaps not only protect the body - they also affect suspension, wheels and braking system. Let's figure out how exactly.

Pros for suspension:

• 🛡️ Shock absorber protection — dirt and sand reduce the service life of oil seals and rods. Mud flaps reduce their wear by 20–30%.
• 🔧 Preservation of anthers — rubber covers of CV joints and steering rods remain intact longer.
• 💨 Reduced brake load — less dirt gets on the discs and pads, which reduces their wear.

Cons for the chassis:

• ⚖️ Additional weight — a pair of plastic mud flaps weighs 1–2 kg, which is not critical, but can be noticeable on sports cars.
• 🌀 Poor brake cooling — if the flaps cover the wheel arch too much, the air circulates less well and the discs overheat.
• 🔊 Increased noise - cheap rubber mud flaps can vibrate at high speeds, creating a hum.

It is especially important to consider the effect of mudguards on aerodynamics. At speeds higher 120 km/h Incorrectly selected shields can:

• 📉 Enlarge drag coefficient (Cx) by 1–3%, which affects fuel consumption.
• 🌀 Create turbulence behind the rear wheels, worsening stability on the highway.

For owners crossovers and SUVs Mud flaps often come as standard - their task is not only to protect from dirt, but also prevent water from entering the interior through drainage holes. On low machines (for example, sedans or hatchbacks) their role is less critical, but still useful.

5. Impact on comfort and operation: washing, noise, appearance

In addition to technical aspects, mudguards affect daily use car. Let's evaluate how convenient (or inconvenient) they are to use.

Pros for comfort:

• 🚿 You have to wash your car less often — the rear remains cleaner longer, especially after rain.
• 👁️ Better visibility — less dirt flies onto the rear window, which is important for safety.
• 🎨 Safety of paintwork — fewer chips and scratches from stones, especially on the highway.

Cons for comfort:

• 🔊 Additional noise - at speeds above 100 km/h Cheap mud flaps may whistle or vibrate.
• 🚗 Deterioration in appearance — many drivers believe that shields spoil the design, especially on sports cars.
• 🧹 Difficulty of washing — dirt accumulates between the mudguard and the arch, and it is difficult to wash it without removing the shield.

The question is especially relevant noise. According to magazine tests "Behind the Wheel" (2023), rubber mud flaps at speed 120 km/h can add up to 2–3 dB to the general noise in the cabin. For comparison: this is the sound of an air conditioner operating at medium power. Plastic shields are usually quieter but less flexible.

Regarding appearance, everything here is subjective. On SUVs (for example, Toyota Land Cruiser or Nissan Patrol) mudguards look organic, and on sports coupes (for example, BMW M4) may look alien. Some manufacturers (for example, Audi or Mercedes) offer mud flaps in body color, which solves the problem of aesthetics.

⚠️ Attention: If you frequently drive off-road, mudguards may get clogged with mud and turn into “bags” of sand, weighing down the car. In this case, it is better to choose models with drainage holes or clean them regularly.

6. Which mudguards to choose: comparison of materials and brands

If you decide to install mud flaps, it is important to choose the right option. They differ in material, fastening and compatibility with the car model. Let's look at the main types.

According to the material:

Material	Pros	Cons	Service life
Rubber (EPDM)	Flexibility, noiselessness, frost resistance	Wear from friction against the tire, may crack	2–4 years
Plastic (polypropylene, ABS)	Rigidity, good stone protection, durability	May burst upon impact, makes noise at speed	4–6 years
Composite (carbon fiber, fiberglass)	Lightweight, durable, sporty design	Expensive, fragile at low temperatures	3–5 years
Metal (aluminium, steel)	Maximum protection, long service life	Heavy, may rust, dear	5–10 years

By brand:

• 🏆 Original (OEM) - fit perfectly, but are expensive. Examples: Toyota (article 64815-0C010), Volkswagen (1K6 805 601).
• 💰 Premium analogues - high-quality universal models. Popular brands: Hepu, Febi, Mannol.
• 🛒 Budget - cheap, but often fragile. Examples: Autoprofi, SCT.
• 🏁 Sports - for tuning, often made of carbon fiber. Brands: Eibach, H&R.

When choosing, pay attention to:

• 📏 Car model matching — universal mudguards may not fit the mounts.
• 🔩 Mounting type - clips, screws or adhesive tape. The most reliable option is factory mounting points.
• 🎨 Color — black shields are universal, but can be matched to the color of the body.

For winter operation It is better to choose rubber or flexible plastic mudguards - they will not burst in the cold. For summer off-road Metal or composite ones are suitable, as they are better able to withstand impacts from stones.

7. How to install mudguards yourself: step-by-step instructions

Installing mud flaps is a simple procedure that you can do yourself in 30-60 minutes. You will need:

• 🔧 Set of screwdrivers (phillips, flat).
• 🔨 Plastic clips (if not included).
• 🧴 Degreaser (for example, white spirit).
• 📏 Tape measure or ruler (to check gaps).

Step by step instructions:

1. Preparation — lift the car on a jack or drive it into a viewing hole. Clean the mounting area from dirt.
2. Trying on — attach the mudguard to the arch and check whether it does not interfere with the rotation of the wheel (the gap should be at least 5 cm).
3. Fastening:
   • If there are factory holes, use them.
   • If not, drill new ones (drill diameter 6–8 mm).
   • Secure the mudguard with clips or screws (do not overtighten!).

Check — spin the wheel manually, make sure that the shield does not catch. Drive 5–10 km and check the reliability of the fastening.

⚠️ Attention: On some vehicles (for example, Hyundai Solaris or Kia Rio) to install mudguards you need to remove the rear bumper. If you are not confident in your abilities, it is better to contact a service station.

The cost of installation on the service is from 500 to 1500 rubles for a couple. If you do not have experience working with tools, it is better not to take risks: an incorrectly installed mudguard can fall off while driving and damage the wheel.

FAQ: Frequently asked questions about rear mudguards

🔹 Is it necessary to install mud flaps on a new car?

If the car is new, mud flaps are not mandatory, but their installation will extend the life of paintwork and suspension. This is especially true for regions with salt on the roads in winter. On many models (for example, Skoda Octavia or Renault Duster) mudguards come as standard.

🔹 Is it possible to drive on the highway without mudguards?

Yes, you can, but this will increase the risk of chips on the rear of the body from stones. In addition, on a wet road, your car will splash the cars behind you more, which may cause dissatisfaction with other drivers.

🔹 How often do you need to change mudguards?

Service life depends on the material:

• Rubber - every 2-3 years (they crack due to frost).
• Plastic - every 4-5 years (may burst from impacts).
• Metal - once every 5-7 years (they rust around the edges).

Check their condition every seasonal tire change.

🔹 Do mud flaps affect fuel consumption?

The impact is minimal - no more 0.1–0.3 l/100 km. Mud flaps increase drag, but at speeds up to 120 km/h it's unnoticeable. At high speeds (over 150 km/h) a slight increase in flow rate may be observed.

🔹 Is it possible to paint mudguards in the color of the body?

Yes, plastic mudguards can be painted acrylic paints after primer. To do this:

1. Clean the surface from grease.
2. Apply plastic primer (eg Plasti Dip).
3. Paint in 2-3 layers to dry.
4. Apply varnish to protect against chipping.

It is not recommended to paint rubber mudguards - the paint will peel off quickly.