Frequently Asked Questions and Application Information


How does it sense when you are braking?

The MC Brake Flasher uses a mercury switch to sense when you are braking.  When you brake, the mercury slides forward connecting the contacts, activating the LEDs to flash.

How is the sensitivity adjusted?

The sensitivity is adjusted by adjusting the angle of the mercury switch.  The steeper the angle, the more difficult it is for the mercury to slide forward causing less sensitivity, and likewise the lower the angle the easier it is for the mercury to slide forward increasing the sensitivity.

How long do the batteries last?

The batteries typically last over a year; the life also depends on how you adjust the sensitivity, if the sensitivity is adjusted so the brake flasher turns on every time you brake the battery life will be shorter.  If you adjusted the unit so that it activates when you brake slightly harder than normal, you can expect the batteries to last about a year.

How much do the batteries cost to replace?

The batteries are CR2032 Lithium coin cells. The MC Brake Flasher comes installed with two of them.  They typically cost between a $1 and $1.50 each, and are available at just about any department store.  They are usually found in the department stores as a calculator battery.

Is it weather proof?

Yes, it is weatherproof.  It has been well sealed, and the brackets are corrosion resistant.

How much can the sensitivity be adjusted?

The sensitivity can be increased so that it flashes every time you brake, it can be lowered so that it will only activate if you slam on your brakes, and it can be adjusted anywhere in-between.

What color are the LEDs?

The lights are superbright red LEDs.

Does it remain flashing once you are stopped?

No, once the deceleration drops below the level you adjust the sensitivity to, it stops flashing.  It only flashes when the deceleration exceeds the level the sensitivity is adjusted to.

Application Information

The Motorcycle Brake Flasher is available in a wireless battery powered version, and a 12 or 6 Volt wired version.  Please ask yourself the following questions to determine which style best fits your application.
  • Do you plan on adjusting the brake flasher with high sensitivity so that it flashes every time you brake?

  • Does your bike have heavy vibration at idle or do you ride frequently on rough roads?
  • Do you want the brake flasher to activate every time you brake independent of deceleration?
If you answered yes to any of the questions above, then the wired version will work great for your application.

If you answered no to the questions above, then both the wired and wireless versions will work great for your application.

Have more questions?

Please contact with any questions.  Your questions will be answered promptly.