Moto-Master Radial Master Cylinder Brake Light Switch

The Moto-Master Radial Master Cylinder Brake Light Switch is a hydraulic pressure-actuated switch designed to integrate with radial-style master cylinders, triggering the rear or front brake light as soon as brake pressure is applied.

It suits riders running aftermarket or OEM radial master cylinders who need a reliable, leak-free replacement or upgrade over mechanical push-rod style switches. As a Moto-Master component, it is built to the brand's established standards for motorcycle braking system hardware.

• Designed specifically for radial master cylinder brake systems
• Hydraulic pressure-actuated — activates brake light on fluid pressure, not mechanical contact
• Direct replacement switch for compatible radial master cylinder setups
• Moto-Master branded braking system component

Confirm thread pitch and port size compatibility with your specific radial master cylinder before installation.
Use a thread sealant rated for brake fluid contact if required by your master cylinder manufacturer — do not use PTFE tape on hydraulic brake fittings.
Tighten to your master cylinder manufacturer's specified torque; do not over-tighten, as this can crack the switch body or damage the thread.
Before riding, pump the brake lever/pedal several times to pressurise the system and verify the brake light activates correctly.
Inspect the switch and surrounding area for brake fluid seepage after the first few rides and at each scheduled service.
If the brake light fails to activate or illuminates erratically, check wiring connections first, then consider switch replacement.
Brake fluid is corrosive — clean any spillage from painted or plastic surfaces immediately with water.
Do not reuse a switch that has been overtightened, visibly cracked, or has shown signs of leaking.