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Hi, Robert before diagnosing any brake light issue always check the bulb and fuse first for integrity a brake light staying on is usually caused by the front brake light switch, which is mechanical, not disengaging. On early models moving the throttle control housing closer to the front brake master cylinder is the main fix. On late models, the switch gets tweaked and needs to be realigned. A brake light that does not come on when the brake lever is applied can be caused by a faulty switch or no continuity in the wiring at the switch. The rear brake light switch is hydraulic and it is extremely rare to malfunction in a closed circuit condition causing the brake light to stay on. Usually, rear brake light switch issues are caused by no brake pedal free play or a sticky rear master cylinder piston. A brake light that does not come on when the rear brake pedal is depressed can be caused by a faulty switch, air contamination in the brake line, or no continuity in the wiring at the switch. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day. Motorcycle front brake light switch Universal How to Repair2 HD Replace Motorcycle Rear Brake Light Switch http://bob.ollis-brown.co.uk/manuals/cbf1000/2006-2008-CBF1000-A-21%20LIGHTS-METERS-SWITCHES.pdf Honda 2006 CBF1000 Owner Manual Free Honda Motorcycle Service Manuals for download
I had a similar problem with my CBF1000 when almost new. Local garage took bike back in and jumped up and down on the gear lever for 20 mins and told me to try it once more. If not cured the engine would need to come out to replace neutral switch!. After a little investigation I found that the switch fitted to the clutch needed cleaning. After cleaning that switch the problem has never reoccurred. Has to be worth a try. I would be tempted to clean switch on side stand as well before resorting to try and replace the neutral switch.
Locate the wire harness coming out of the stator on the left crank case cover of the motor and follow it to the plug with three yellow wires. This is the stator plug. You should have continuity between any combination of the three yellow wires, but no continuity between any of the yellow wires and ground. If the stator yellow wires are grounding you will have to replace the stator. To replace the stator remove the left crank case cover and unbolt the stator from the inside of the cover. Do not forget to purchase a new left cover gasket with the new stator or you will just delay your riding.
Locate the wire harness coming out of the back of the motor and follow it to the plug with three yellow wires. This is the stator plug. You should have continuity between any combination of the three yellow wires, but no continuity between any of the yellow wires and ground. If the stator yellow wires are grounding you will have to replace the stator. To replace the stator you have to remove the motor from the frame or at least unbolt the motor and rotate it enough to remove the rear cover and unbolt the stator.