Bonneville T100 Break Light

Hi, have you been doing any work on it recently? I would check the cables around the area where they come in at the mudguard for any wear.

 

Hi Ruth, is it the traditional type of brake light switch, what I mean is has it got a spring connected to the brake pedal pulling on a small metal rod? If it is then it could be that causing the problem. Water can get past the rubber seal corroding the contacts. Give it a good squirt of WD40 or similar behind the seal whilst working the switch back and forth. If it doesn’t improve it could need replacing. As for the front you’ll have to have a look at that switch under the brake lever, it’s quite small but you should be able to hear a faint click as it operates. Apart from checking all the wires for damage that’s about all that’s involved with putting the brake light on. It’s an mot requirement that it works on both front and rear. Good luck.

 

Yes, try WD40 (other penetrating oil and water-displacing sprays are available) before contacting the dealer!

 

That is the master cylinder for the rear brake. The dark bit, sorry for the simplified explanation here, has a rod underneath connected to the brake pedal and contains a piston which when you put your foot on the pedal pushes brake fluid through the hose and puts the rear brake on. The bit at the top with the two spade connectors on is the switch. I’m not 100% on how these work, either by the increase in pressure when the pedal is pressed, or by making contact inside when the pedal is pressed but that is the bit you’ll need to change and looking at how it screws off you will need to remove the pedal, and master cylinder and be prepared to bleed the system after wards as it forms part of the brake hoses. Hope that all makes sense.

 

You Need a Triumph Bonneville T100 Rear Brake Light Switch Sensor

 

....and l think you may need a new calendar