The WOD Hydraulic Brake Light Switch Plumbing Kit provides a clean, compact way to add pressure-activated brake lights to a custom -3 AN brake system. Built around an inline -3 AN union with an integrated 1/8" NPT port, this kit allows builders to install a compatible hydraulic brake pressure switch without fabricating a mechanical pedal switch bracket. Ideal for tube chassis buggies, rock bouncers, trail rigs, race vehicles, and other custom builds, the pressure-switch design activates the brake lights when hydraulic pressure is created in the brake line. The included tube nuts and ferrules provide the components needed to integrate the union into compatible -3 AN brake plumbing. Includes: (1) -3 AN Inline Union with 1/8" NPT Port (2) -3 AN Tube Nuts (2) -3 AN Ferrules Note: Hydraulic brake pressure switch is not included. The brake system must be properly bled after installation. Specifications Specification Details Manufacturer Wide Open Design Product Type Hydraulic Brake Light Switch Plumbing Kit Brake Line Connection -3 AN Pressure Switch Port 1/8" NPT Union Style Inline Tube Nuts Included 2 Ferrules Included 2 Pressure Switch Included No Mounting Style Inline Brake Plumbing Application Custom -3 AN Hydraulic Brake Systems Fitment Universal Fitment for Custom -3 AN Brake Systems Common Applications: Tube chassis buggies Rock bouncers Rock crawlers Ultra4-style race vehicles Trail rigs Custom off-road vehicles Race cars Custom pedal assemblies Vehicles without a factory brake light switch Fitment Notes: Designed for brake systems using compatible -3 AN brake tubing and fittings. Accepts a compatible 1/8" NPT hydraulic brake pressure switch. Pressure switch, wiring, terminals, and brake light circuit components are not included. Install the union in a location that remains accessible for inspection and switch service. Keep wiring and brake lines away from exhaust heat, sharp edges, and moving suspension components. Use thread sealant approved for brake-system applications only where appropriate. Do not allow thread sealant to contaminate the hydraulic passage. The brake system must be properly bled and inspected for leaks after installation. Professional installation is recommended for all hydraulic brake components. FAQ How does a hydraulic brake light switch work? A hydraulic brake light switch reacts to pressure inside the brake line. When the brake pedal is applied and hydraulic pressure rises, the switch closes the electrical circuit and activates the brake lights. Why use a pressure switch instead of a mechanical pedal switch? A pressure switch eliminates the need to fabricate and align a mechanical switch at the pedal assembly. This can simplify brake light installation in tube chassis vehicles, custom pedal systems, and builds where pedal movement or available mounting space makes a mechanical switch difficult to package. Is the hydraulic pressure switch included? No. This kit includes the inline -3 AN union, tube nuts, and ferrules. A compatible 1/8" NPT hydraulic brake pressure switch must be purchased separately. Where should the union be installed? The union should be installed in a compatible section of the brake plumbing where it can sense hydraulic pressure and remain accessible for wiring, inspection, and future switch replacement. Final placement depends on the brake-system layout. Will this work with any brake system? This kit is designed for custom hydraulic brake systems using -3 AN plumbing. It is not a universal adapter for every factory brake line, flare type, thread standard, or tubing size. Does the brake system need to be bled after installation? Yes. Opening the hydraulic brake circuit introduces air into the system. The brakes must be properly bled and checked for leaks before the vehicle is operated. Can a hydraulic pressure switch replace a factory brake light switch? It may be used as the brake light trigger in a properly wired custom system. Factory vehicles may use additional circuits for cruise control, transmission interlocks, stability control, or engine management, so replacing an original switch may require more than a simple two-wire pressure switch. What wiring is required? The exact wiring depends on the selected pressure switch and vehicle electrical system. The switch is generally used to open or close the brake light circuit when hydraulic pressure is applied. Wire size, fuse protection, relay use, and grounding should match the electrical load and switch manufacturer's instructions.
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