Brake light switches

Brake light switches are now compulsory in most countries — Laverda have fitted them front and rear for some years — in fact the front one appeared in March 1969 on frame number 1989, rear ones having always been fitted.

The front drum brake light switch sits in the front hand lever and is fitted parallel to the cable run. As the hand lever is released, it touches the plunger of the switch and pushes it in, and the light goes on. Obviously it is important that the switch's adjustment is right otherwise either nothing happens or the switch is squashed. Two types of switch have been fitted although they can

The early Bosch switch gear. Bosch headlamp with ignition key and early ND instrument mounting. The early cable operated brake light switch is hiding under the right hand lever. Date: 1972 SF
Laverda Brake Light Switch
1973 SF only: Lucas switches, twin throttle cable and ND instruments
Trump Chopper 650 750

Those excellent Jaoanese switches. It's a 1978 The underside of the latest instrument mounting. That

Marzocchi forked 1200 centre hexagon headed set screw fixes the rubber mounted 'ring'

be defined crudely as 'short' for early machines with Tommaselli levers and Bosch switches, 'long' for SF, GTL and Triple with Lucas switches, and most SFCs. The switches, if in proper adjustment, last forever.

Adjustment is simple. The switch screws into the lever casting and there is a lock nut. It makes good sense to have a rubber cover over the switch.

The rear drum brake light switch is the conventional 'spring pull' type. It's a small switch which is fixed by one bolt to a frame bracket. A little arm on the rear brake lever arm operates it against its spring. It is covered by a rubber hood. If it doesn't operate, first check the wiring then check its operation. If it is dead, then renew it. Repairs are not possible. These switches sit in the firing line of road dirt. The spring will often rust apart.

The disc brake switches are incorporated in the hydraulics. The front one sits on the bottom fork yoke in the banjo. It sits in the middle and is a simple screw-in plug from which are taken two leads. The switch sits on a copper washer and works using the pressure from the hydraulic fluid. It cannot be repaired, and if replaced, the hydraulic system must be bled. It too sits in the strongest flow of road dirt and will need looking after even though it should be covered by a rubber hood.

The rear disc brake switch is also incorporated in the hydraulic system although this time it screws into the end of the foot master cylinder. It too has two electrical leads and a rubber hood. This switch is very hard to remove because there is little room to move. When removing remember that it fixes the hose which goes to the rear caliper and that two copper washers must be used, one either side of the hose banjo. Always bleed the system too.

NOTE: Machines with left foot gear changes (and right foot brake pedals) fit the switch direct into the rear caliper — the switch fixes the hydraulic pipe.

Trump Chopper 650 750

An early 750GT frame and fuel tank

Suzuki Gs1000 Carburetor Adjustment

An early 750GT frame and fuel tank

The last 750 frame. This one's an SF3 but the others are similar

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