Mercedes-Benz SLK Brake Light Switch Replacement Parts

Yes, every variant of the Mercedes-Benz SLK has a brake light switch — it is a standard component on all petrol and diesel models across all generations, as it is required to activate the brake lights when the pedal is pressed. The switch is typically mounted on the brake pedal bracket under the dashboard. There are no SLK variants where this part is absent.

The R170 and R171 are distinct generations with different pedal box assemblies, so the brake light switch from an R170 is unlikely to be a direct plug-and-play fit for an R171. The R170 ran from 1996 to 2004 and the R171 from 2004 to 2011 — these represent a clear generation boundary. Always confirm the exact part number with the breaker against your registration before buying.

For the brake light switch specifically, engine size does not affect fitment — the switch operates on the brake pedal mechanism, which is consistent across the SLK engine range within the same generation. Whether you have a 200, 250, 300, or 350 engine, the switch is the same within your generation. Focus on matching the generation (R170, R171, or R172) rather than the engine variant.

Trim level does not affect brake light switch fitment on the SLK — the switch is part of the pedal assembly, which is unchanged across trim levels within the same generation. An AMG Sport or Final Edition SLK uses the same switch as a standard model of the same generation. The breaker may offer switches pulled from any trim, and that is perfectly fine for this part.

The R172 generation ran from 2011 onwards, so a 2014 and 2016 car are both within the same generation and the brake light switch is very likely to be compatible. That said, confirm the part number with the breaker against both registrations to be certain, as minor running changes can occur within a generation. Never assume fitment without the breaker checking against your specific reg.

A faulty brake light switch is a very common cause of brake lights remaining on permanently on the SLK, and a used replacement from a breaker is a cost-effective solution. Make sure you give the breaker your registration so they can supply the correct switch for your generation (R170, R171, or R172). It is worth asking the breaker to confirm the switch was tested working before removal, as this is a safety-related component.