Mercedes Number Plate Falling Off? Why It Happens and How to Fix It
Mercedes number plate falling off? The short answer: most Mercedes have a coated black base where the front plate goes and four raised rivets in the rear plate recess. Normal 1 mm pads can’t grip the coating or clear the rivets, so the plate lifts or rattles. Clean and warm the surface before fitting, use 5 mm pads on the back, or fit a frameless holder.
Written by the PlateBoss team, led by owner HD. We’ve been making plates since 2019 and are a DVLA-registered number plate supplier with a workshop in Hounslow, west London, where we fit plates on Mercedes every week. Checked against GOV.UK guidance on number plates, October 2026. How we write our guides.
In this guide
- The front: the coated black base
- The back: four rivets
- How to stop a Mercedes number plate falling off: 6 steps
- When a holder is the better fix
- Or let us fit them
- FAQs
The front: why pads won’t stick to the black base
On most Mercedes, the front plate doesn’t go onto the bumper itself. It goes onto a black plastic base that sits below the grille. That base has a coating on it, and the coating is the problem.
Adhesive pads grip paint and bare plastic well. On a coated surface they get a much weaker hold. The plate often looks fine for a few days, then a corner starts to lift, a gap opens along the top edge, or it starts to rattle over speed bumps. Rain and car washes speed it up.
A Mercedes number plate falling off is one of the most common fitting jobs we see at the workshop. People have usually fitted the plates perfectly well. The surface just wasn’t ready for them.
The back: the four rivets
Most Mercedes have four rivets sticking out of the rear plate recess. Standard number plate pads are about 1 mm thick, which isn’t enough to clear them. The plate ends up resting on the rivets instead of the pads, so the pads barely touch it and it never bonds properly.
The fix is pads that are thicker than the rivets stick out. That’s why our thick pads kit for Mercedes includes three 5 mm pads alongside ten 1 mm pads.
Fitting plates on a Mercedes yourself? Add the 10 + 3 thick pads kit (£6.99) when you order. Bevelled plates are the most popular style with our Mercedes customers.
See bevelled platesAsk us on WhatsAppHow to stop a Mercedes number plate falling off: 6 steps
- Take the old plate off and clean the area. Household cleaner usually does the trick. Old sticker residue may need a commercial glue remover.
- Dry it completely. Fit indoors or on a dry, mild day. Pads don’t bond to a damp surface.
- Warm the surface and the pads. Use a hairdryer on a warm setting for a minute or so just before you stick the plate on. It helps the adhesive bond, and it’s what we do in the workshop after preparing the surface. Don’t overheat painted or plastic parts.
- Front plate: put the 1 mm pads along the top and bottom edges of the plate, line it up centrally and press firmly along the whole plate for about 30 seconds.
- Rear plate: put the 5 mm pads between and around the four rivets, so the plate sits on the pads and not on the rivets. Add 1 mm pads anywhere the plate touches flat bodywork.
- Leave it 2 to 3 days before washing the car, so the pads can bond fully.
Our main guide to fitting number plates covers pads, screws and holders on any car, and our number plate position guide explains where the law says plates have to go.
When a holder is the better fix
If you want the plate to stay put without relying on the coated base, a frameless number plate holder is the surest way to stop a Mercedes number plate falling off. The holder screws onto your car’s existing fixing points and gives the plate a flat, solid surface to stick to. At the back it sits on top of the four rivets, so they stop being a problem.
Ours are frameless: there’s no rim or lip over the plate, just a slim black backing, so nothing covers the characters or the supplier mark. They fit standard-size plates, come with screws and pads, and cost £20 a pair. Add them when you order your plates (choose “Borderless Frame Holders” in the fixing kit step), ask us on WhatsApp, or pick a pair up at the workshop. If you’re wondering whether holders and surrounds are allowed at all, our guide to whether number plate surrounds are legal covers it.
If you’d rather drill, our pre-drilled plates guide explains the options. Just bear in mind that drilling one of our plates yourself voids its 3-year warranty.
Another option: a magnetic fixing kit. Our magnetic number plate fixing kit (£25 a pair) screws magnet mounts into the surface and holds the plate on metal discs stuck to its back. It doesn’t rely on adhesive gripping the coated base, and the plate can come off and go back on by hand. Our guide to magnetic number plates shows how it fits.
Or let us fit them
If you’re near west London, we’ll do it for you. Fitting at our Hounslow workshop is £30 with our plates (£40 if you bring plates from somewhere else) and takes about 20 minutes. We prepare the surface, warm the base and the pads, and fit the plates so they stay on. We see far fewer comebacks for a Mercedes number plate falling off when we’ve fitted it ourselves. Booking is required: see number plate fitting.
Every pair you order comes with our 3-year warranty against fading and characters coming off by themselves. You’ll need photo ID and proof you’re entitled to the registration, usually the V5C logbook.
Popular plates with Mercedes owners
Bevelled Number Plates
£69.99
4D 3mm Number Plates
£44.99
3D Gel Number Plates
£44.99
Replacement Number Plates
£29.99Order by 2pm and we dispatch the same day once your documents arrive. Free Royal Mail Tracked 48, or collect free from our Hounslow workshop.
Shop bevelled platesBook fitting in HounslowWhatsAppMercedes number plates: FAQs
Why do number plates keep falling off my Mercedes?
On most Mercedes the front plate sits on a coated black base that ordinary pads struggle to grip, and the rear recess has four rivets that stop thin pads touching the plate. Fix the front with clean, warmed pads and the back with 5 mm pads or a holder.
What adhesive pads do I need for a Mercedes?
Thin 1 mm pads for the front and anywhere the plate sits flat, plus thick 5 mm pads for the rear so the plate clears the four rivets. Our 10 + 3 thick pads kit has both and costs £6.99 when you add it to a plate order.
Can I screw number plates onto a Mercedes?
You can use the existing fixing points, but drilling one of our plates voids its 3-year warranty. A frameless holder screws to the car instead, so the plate itself stays undrilled.
Is a number plate holder legal?
Yes, as long as nothing covers the characters or the supplier mark at the bottom of the plate. Our frameless holders have no rim over the plate face, so nothing is covered.
How long should I wait before washing the car?
Give it 2 to 3 days so the pads can bond fully before a car wash or pressure washer.
PlateBoss isn’t affiliated with Mercedes-Benz. We use the name only to describe the cars these tips apply to.
