Brake light switch repair (rear)

I also ended up rebuilding a rear brake switch at the advice of Joe at the Guzzi doc (we broke it while adjusting the shift bias...long story) and took some pics that might be helpful to someone some time. It's quite a simple and elegant part.

I ground the rivets off from the back with a cut off wheel on the Dremel. The switch comes apart and has a metal backing plate, a gasket, and the main switch housing.

The brass contact arms can break, so as long as they are intact the switch can be rebuilt. The spring pushes the brass rod down to break continuity when the brake pedal is depressed.

I lightly sanded the contact surfaces until clean and shiny and then applied some dielectric grease. I put a thin coat of Yamabond on either side of the original gasket and bolted it back on the bike.

During reassembly of my Guzzi 1973 V7 850 GT California (after replacing the seal behind the clutch) the rear CEV brake switch lost one of it's cable connectors.

I was able to carefully open the switch by bending back the hollow rivets holding the backplate.

I repositioned the cable connector with the inner contact and fixed it by peening over the rivet which came loose.

The inner sliding rod which is spring loaded had to be removed.

I reused the outer hollow rivets to reassemble the switch.