Ford P100 Brake Light Switch Replacement Parts

Yes, the Ford P100 is a rear-wheel-drive pickup truck with a conventional hydraulic braking system, and it is fitted with a brake light switch mounted on the brake pedal assembly. The switch activates the brake lights when the pedal is depressed and is a standard component across all variants of the P100. If you are searching for this part, you are looking in the right place.

The Ford P100 was produced from 1983 through to 1992, based on the Sierra platform, with a facelift arriving around 1987 that updated the cab styling. Whether the brake light switch from a pre-facelift (1983–1987) car swaps directly onto a post-facelift (1987–1992) car is not guaranteed, as pedal box assemblies can differ across that boundary. Confirm the exact year of both donor and recipient vehicles with the breaker against your registration before buying.

For the brake light switch specifically, engine size is unlikely to be the determining factor, as the switch is mounted on the pedal box rather than being part of the braking hardware that varies with engine output. That said, it is always worth confirming the year of the donor vehicle matches yours, as changes across the P100's production run matter more here than whether the engine is a 1.6, 2.0 or 2.9. Give the breaker your registration to cross-reference.

The brake light switch is a pedal-mounted electrical component and is not directly tied to the payload or GVW rating of the truck, unlike braking components such as discs, drums or master cylinders where weight rating can matter. You should still confirm the model year of the donor vehicle with the breaker, as that is the most relevant variable for this part on the P100.

Trim level does not affect which brake light switch you need on the Ford P100, as the pedal box and switch are part of the running gear rather than anything trim-specific. Whether the donor vehicle is a base-spec or a higher-grade example makes no practical difference for this component, so do not let trim level put you off a good-condition switch from a breaker.

The Ford P100 shares its platform with the Sierra, so there is a reasonable possibility that pedal-box components including the brake light switch are common across both models. However, you should not assume fitment without checking, as cab and chassis differences mean parts do not always cross over directly. Confirm compatibility with the breaker using both your P100's registration and the Sierra donor vehicle's year before purchasing.