Brake disc splash guards — sometimes called backing plates or dust shields — are thin pressed-steel panels that sit immediately behind each brake disc, protecting the disc's inner face and wheel bearing from water spray, road grit, and mud thrown up during driving. Although they carry no braking load, their presence keeps the disc surface free of the sustained contamination that accelerates uneven wear and causes surface corrosion between the pad sweep area and the outer disc edge. On vehicles where the backing plate has corroded and collapsed against the disc, the most telling sign is a continuous metallic grinding or scraping sound that persists even when the brakes are not applied — the distorted steel lip dragging against the rotating disc. Replacement is straightforward but access is tight on many vehicles, particularly on rear axles with integrated handbrake mechanisms. Klokkerholm and A.B.S. both cover a comprehensive range of applications and produce splash guards stamped to OEM dimensions, ensuring the mounting holes align with the hub carrier and the clearance to the disc face remains within specification. Because disc diameter, offset, and hub carrier bolt pattern vary across the same model range — the VW Golf and Audi A4 families being prominent examples — selecting by OE number avoids the costly rework that comes from fitting a guard that fouls the disc or misses a mounting point.
Splash guards are specific to axle position, disc diameter, and hub carrier geometry — a front left unit is not interchangeable with a rear right even on the same car. The OE number encodes all of these parameters and is the most reliable way to confirm compatibility. Use the make-model-year-axle selector on this page, or cross-reference the number stamped on the existing guard if it's still legible. On VW Group cars, trim level can affect disc size, which in turn changes the guard profile, so year and spec level both matter.
Not in practice. Splash guards are stamped from mild steel typically only 0.6 to 1.2 mm thick, and once a section has corroded through or been bent by road debris, the material is too thin to weld or reshape without distorting the overall geometry. A distorted guard that contacts the disc will cause continuous noise and accelerate disc wear. Replacement parts from Klokkerholm or A.B.S. are generally inexpensive, making repair a false economy compared to fitting a new pressed unit.
Indirectly, yes. A collapsed or perforated splash guard exposes the inner disc face and wheel bearing to sustained water and grit ingress, which accelerates disc corrosion beyond the swept braking area and can contaminate bearing lubricant over time. More immediately, a guard that has bent and is fouling the disc creates consistent drag, which warms the disc and pad, reducing the thermal headroom during heavy braking. A guard contacting the disc can also be mistaken for brake squeal or a worn pad indicator, delaying the correct diagnosis.
A persistent low-level scraping or grinding sound that is present at all times — not just under braking — is the most common sign, caused by a corroded guard edge contacting the rotating disc. Visible heavy rust or large perforations on the guard when inspecting through the wheel are clear indicators of structural failure. Unusual disc wear on the inboard face, where the swept area shows heavier corrosion than normal, also suggests the guard is no longer providing adequate protection against water spray from inside the wheel arch.
Showing 100 of 1,916 Brake disc splash guard OE numbers. Enter the OE on the main OE search to jump to any reference.
