Mud apron

Mud flaps limit the spray of water, mud, stone chips and road salt behind the front wheels of MAN and Mercedes trucks, buses and vans. They not only protect other road users, but also reduce contamination and corrosion exposure on underride guards, lighting, brake components, air tanks and chassis wiring. On tractor units, they also protect entry steps, fuel tanks and chassis wiring against splashing dirt. A correct selection always requires identification based on the vehicle's chassis number. Visual comparison or selection solely by model name is never sufficient, as axle configuration, mudguard version, chassis width, wheel size and mounting points may differ.

Mud flaps are used as separate rubber flaps behind or in front of a wheel, as a set with a mud flap bracket or as part of a complete mudguard and wheel protection system. Front axle versions are available for MAN F2000, TGA, TGL, TGM, TGS, TGX and TG3, as well as for Mercedes Atego, Axor, Actros, Arocs and Econic. On MAN TGE and Mercedes Sprinter models, the flaps are generally more compact and designed to fit the plastic wheel arch liner, while city buses such as the MAN Lion’s City, Mercedes Citaro and Neoplan Cityliner may have different lengths and mounting geometries due to their low floor height and specific wheel arch construction.

Professional mud flaps are usually made of reinforced rubber, thermoplastic elastomer (TPE) or flexible polyethylene. Rubber offers high tear resistance and remains flexible at low temperatures; TPE is lighter and retains its shape better, but may be more susceptible to notch stress during intensive construction-site use. The flap length must provide adequate protection without striking the tyre, road surface or suspension components during full suspension compression, tyre deformation or reversing. Also consider the thickness, pre-drilled mounting holes, mounting centre distance and the corrosion resistance of brackets, bolts and washers.

Torn mud flaps are often caused by contact with kerbs, loose stone chips or freezing to snow and ice. In construction transport, clay, gravel and debris create high dynamic loads on the lower edge. A missing or excessively short flap often results in noticeably dirty fuel tanks, increased stone-chip damage to body parts and accelerated deterioration of chassis components caused by moisture and salt.

First inspect the material for longitudinal tears originating from the mounting holes, hardening, delamination of any textile reinforcement and worn lower edges. Then measure the clearance between the mud flap and tyre at normal ride height. Also check this clearance with the air suspension in its lowest position and at maximum steering lock on steering axles. Inspect the steel or aluminium mud flap brackets for bending, corrosion and elongated bolt holes. Loose fasteners cause oval holes and may result in resonance cracks in both the flap and the mudguard. Finally, check that the flap does not touch brake lines, ABS sensor wiring (Anti-lock Braking System) or air suspension components.

Replace a mud flap when tears extend to a mounting hole, the material has become brittle, the flap remains permanently deformed or sufficient clearance from the tyre and road surface can no longer be ensured. Simply trimming a torn corner is rarely a durable repair: effective protection is reduced and the remaining edge may tear further. If brackets are damaged, preferably replace the flap, bracket and fastening set together so that fitment and clamping pressure are correct again.

Before installation, clean the contact surfaces of the mudguard and bracket, remove corrosion and use fasteners with suitable corrosion protection. Tighten bolted connections evenly to the specified torque; excessive clamping force tears the rubber around the holes, while insufficient preload leads to movement. A correctly fitted mud flap remains free to move, hangs vertically and provides maximum protection without interfering with tyre rotation. A comprehensive stock of suitable body parts supports fast, vehicle-specific repairs.