Hydraulic Rear Brake Light Switch for 2008-2017 Harley Dyna

Billet Proof Designs hydraulic rear brake light switch is a direct-fit replacement for 2008–2017 Harley Dyna and FLD models that restores reliable brake-light activation with corrosion-resistant materials and DOT-compatible components.

When a worn or corroded brake light switch leaves your bike without a functioning rear brake light, replacement parts must be durable, weatherproof, and electrically dependable. This Billet Proof Designs switch is built to meet those needs: it uses high-temperature engineering plastic, an EPDM diaphragm compatible with DOT 3/4/5 brake fluids, silver-plated terminals for improved contact, and a zinc-plated steel body proven to resist corrosion longer than original-equipment units in salt-spray testing. It directly replaces Harley part number 72026-08A and fits a range of 2008–2017 Harley Dyna and FLD models.

Will this switch fit my Harley Dyna or FLD model?

Yes — the switch is manufactured to match the original mounting and electrical interface for specific Harley models from 2008 through 2017. It is a direct replacement for HD part #72026-08A, so installation is usually plug-and-play with existing brake lines and connectors.

• Compatible models: FXD Super Glide, FXDL Low Rider, FXDWG Wide Glide, FXDB Street Bob, FXDF Fat Bob, FLD Switchback (2008–2017).
• Direct-fit design replaces HD# 72026-08A without modification.
• Standard electrical terminals and mounting footprint for simple swap-out.

How does the switch resist corrosion and rough conditions?

The switch body is zinc plated steel, which the manufacturer tested against original-equipment parts using back-to-back salt spray testing; results showed the Billet Proof switch delays visible red corrosion longer than OE. Protective finishes and material selection reduce failure risk from road salt, moisture, and typical exposure for motorcycles.

• Zinc-plated steel body for improved outdoor corrosion resistance.
• Silver-plated electrical terminals to resist tarnish and maintain conductivity.
• Engineering plastics and robust sealing to block water and chemicals.

What materials and fluids is the switch compatible with?

Materials were chosen for thermal stability and chemical compatibility. The connector uses engineering plastics rated for high temperatures and common automotive chemicals, while an EPDM diaphragm handles a range of brake fluids without swelling or degradation.

• EPDM diaphragm compatible with DOT 3, DOT 4, and DOT 5 brake fluids.
• High-temperature engineering plastic resists automotive chemicals and heat.
• Silver-plated terminals maintain low-resistance connections under corrosion stress.

How simple is installation and what should I check after fitting?

Installation is straightforward for anyone comfortable with basic motorcycle maintenance. The switch replaces the OE unit directly; after mounting and reconnecting, bleed any trapped air if the brake line was opened and verify brake lights activate under lever or pedal pressure.

• Plug-and-play electrical connector and mounting for direct swap.
• Observe brake fluid level and bleed lines if the hydraulic circuit was opened.
• Test brake-light activation at rest and during applied pressure before riding.

Who this product is for: Riders and mechanics who own 2008–2017 Harley Dyna or FLD models and need a durable, corrosion-resistant replacement for a failing rear hydraulic brake light switch. It’s especially suited to bikes ridden in wet or salty conditions, or for owners who prefer parts with improved contact plating and tested anti-corrosion finishes. If you want a direct-fit replacement that uses brake-fluid-compatible materials and offers reliable electrical contact, this Billet Proof Designs switch is engineered to meet those expectations.