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Brake light alwasy stay on

I have a Giantco Royale I 125 and his brake light always stay on. what can be the cause? thanks

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  • Motorcycles Master
  • 8,404 Answers

Adjust your brake light switch ... it may be defective. Find it near the lever and or inder the pedal linkage.

Posted on Nov 30, 2012

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Posted on Jan 02, 2017

wd4ity
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SOURCE: noticed the brake light was alwasy on where are

There is a switch on the handlebar brake lever and a pressure switch somewhere along the metal rear brake line. Since they change the location of this pressure switch from time to time and I don't know exactly where it is on your bike, just follow the metal brake line that comes out of the back of your rear brake master cylinder. You'll recognize it when you see it. It will have two or four wires connected to two spade plugs.

If I were a betting man, I'd bet that someone at some time has loosened the master cylinder on the handlebars to adjust something or taken the throttle switch housing loose. The front brake light switch in located inside the throttle switch housing. If the master cylinder and the switch housing are not firmly pushed against each other, the brake lever will not depress the front brake switch when your release the brake. This will cause the brake light to stay on all the time. Loosen the master cylinder clamp bolts and slide the master cylinder and brake lever snuggly against the face of the switch housing. This will probably fix your problem. If not, you'll need to do a little electrical troubleshooting to determine whether the front brake switch or the rear pressure switch is bad. For this, you'll need a Volt Ohm meter and a wiring diagram.
Try the switch first.

Posted on Oct 20, 2009

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Hi, Anonymous 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.
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Hi, Anonymous 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.
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Hi, Anonymous 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 blue links below. Good luck and have a wonderful day.
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Noticed the brake light was alwasy on where are


There is a switch on the handlebar brake lever and a pressure switch somewhere along the metal rear brake line. Since they change the location of this pressure switch from time to time and I don't know exactly where it is on your bike, just follow the metal brake line that comes out of the back of your rear brake master cylinder. You'll recognize it when you see it. It will have two or four wires connected to two spade plugs.

If I were a betting man, I'd bet that someone at some time has loosened the master cylinder on the handlebars to adjust something or taken the throttle switch housing loose. The front brake light switch in located inside the throttle switch housing. If the master cylinder and the switch housing are not firmly pushed against each other, the brake lever will not depress the front brake switch when your release the brake. This will cause the brake light to stay on all the time. Loosen the master cylinder clamp bolts and slide the master cylinder and brake lever snuggly against the face of the switch housing. This will probably fix your problem. If not, you'll need to do a little electrical troubleshooting to determine whether the front brake switch or the rear pressure switch is bad. For this, you'll need a Volt Ohm meter and a wiring diagram.
Try the switch first.

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