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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: kevinu on May 31, 2026, 08:23:46 AM

Title: rear brake light constant flashing
Post by: kevinu on May 31, 2026, 08:23:46 AM

1994 K75, rear brake light problem.  The middle light stays on constantly and does not increase in intensity if brake lever is activated.  The two outer lights flash constantly.  I believe that is only supposed to happen upon brake lever activation.  The light on the instrument cluster goes off properly after front and rear brake activation.  Blinkers work correctly.

Title: Re: rear brake light constant flashing
Post by: kevinu on May 31, 2026, 01:49:55 PM

I think I solved this.  It turns out that the rear brake light was flashing because the sensor at the rear brake pedal was not functioning.  Therefore, the system thought the rear brake pedal was activated and that's why the rear brake light was flashing constantly. 

Title: Re: rear brake light constant flashing
Post by: Laitch on May 31, 2026, 03:52:00 PM

Quote from: kevinu on May 31, 2026, 01:49:55 PM

. . . the sensor at the rear brake pedal . . .

Are you referring to the rear brake switch?

(https://motobrick.com/gallery/4/1601-310526154846.png)

Title: Re: rear brake light constant flashing
Post by: kevinu on June 01, 2026, 07:18:06 AM

Yes.  I replaced the brake cylinder last year and the set screw / nut combination backed out to the point that this switch was not activated when the brake pedal was not depressed.  I came up with a solution that hopefully will work. 

Title: Re: rear brake light constant flashing
Post by: Edward on June 01, 2026, 08:00:15 PM

That switch is a pain in the ass. I embedded it in an epoxy steel form to keep it from moving.