Suzuki Motorcycle DR-Z400 Brake Bulb Size

The Suzuki Motorcycle DR-Z400 brake utilizes a P21/5W bulb size for the lighting system. Data for the specific component covers the period from 2000 through 2004.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2000-2007	P21/5W

Bulb Specifications

Description	Bulb Size
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.	P21/5W

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Additional Notes

The P21/5W is the brake bulb type specified for the Suzuki Motorcycle DR-Z400 across all listed model years, spanning 2000-2007.
The P21/5W is a dual-filament bulb, with one filament rated at 21 watts for the brake/stop function and a second filament rated at 5 watts for the tail/running light function.
The bulb operates on a 12-volt electrical system, consistent with standard motorcycle electrical architecture.
The P21/5W uses a BAY15d bayonet base, which features two offset pins positioned at different heights to prevent incorrect insertion of a single-filament bulb into a dual-filament socket.
The P21/5W is governed by ECE (Economic Commission for Europe) standards, giving it broad acceptance across European and international markets.
Because the BAY15d base is keyed by design, a single-filament P21W bulb is not a direct drop-in replacement, as its pin configuration differs from the dual-filament BAY15d socket required by the DR-Z400.