Brake light always on/doesnt brighten - Ducati Supersport 939 Forum
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post #1 of 23 (permalink) Old 01-04-2018, 11:39 PM Thread Starter
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Brake light always on/doesnt brighten

I unfortunately dropped my bike while stopping mid-turn going up a slope, on the rear brake lever side. The lever was pushed in, not bent. I was able to pull it back in position, pretty easily though. So it seems that my brake light doesnt light up when I hit either brake, with headlights on. im not sure if the light is always on or just isnt triggering. If it was the later, pulling the front brake should light it up at least.

I checked if the brake was engaged and thats not the case. The rear wheel is free if i lift it up. Im going to check it in daylight, when the headlights are off, to see if the brake light is not triggering at all or if its always on.

Any ideas what this might be and where I need to look to fix this?
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post #2 of 23 (permalink) Old 01-05-2018, 01:56 AM
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Oh no sorry about that. I am sure by your explanation that the brake light is on all the time. So by re adjusting the free play (the point at which the brake leaver pushes in the actuator to activate the brake light) you should be ok. I had to adjust mine when I adjusted my brake pedal to the correct hight then had to adjust the point the brake light comes on befor the brake actually engages. Hope that makes sense.
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post #3 of 23 (permalink) Old 01-05-2018, 07:03 AM
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On my Monster, the light is actuated when the rear pedal is pushed down and it releases a little switch. Your pedal may not be aligned with the switch anymore. As Rhino said, there's also an adjuster for when the light is actuated.

Last edited by 1uglybastard; 01-05-2018 at 07:06 AM.
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post #4 of 23 (permalink) Old 01-05-2018, 08:57 AM
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[email protected], kelv, that SUCKS!! Both of what they said above isnaccurste. Let us know if either of those doesn't work. We'll keep troubleshooting with you.

Again, sorry to hear. Was there any other damage? Bar ends, plastics, pegs?

~David~

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post #5 of 23 (permalink) Old 01-05-2018, 09:10 AM
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Sorry to hear about your phopas, if the suggestions don't work you could disconnect the switch for the rear brake, that takes that switch out of the circuit and then shorting the wires should put the light on.
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post #6 of 23 (permalink) Old 01-05-2018, 09:26 AM Thread Starter
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Again, sorry to hear. Was there any other damage? Bar ends, plastics, pegs?
No damage, just slight scratch on the bar end. I'll check the lever height adjuster. That's probably it.
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post #7 of 23 (permalink) Old 01-05-2018, 09:56 AM
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No damage, just slight scratch on the bar end. I'll check the lever height adjuster. That's probably it.
Whew...lucky dog!

~David~

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post #8 of 23 (permalink) Old 01-05-2018, 11:29 AM Thread Starter
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Whew...lucky dog!
Twice...one of each side. I hope its scratch proof.

So I did check to see it the point on the rear pedal was covering the sensor spot/hole. It still didnt make any difference. Something tells me theres suppose to be a button on some sort near that sensor point and not just a hole, and it might have broken off when I was pulling the lever in position again, not knowing that there would be a physical switch (stupid me). Cant tell whether this broke off or if its just stuck. If it broke off then it would always be off, correct?

On top of this, the engine diagnosis light came on this morning, #9 on the manual, amber yellow. It was on yesterday after the drop, till i was back home. I tried turn off the bike and on again, didnt make it go away.

Didnt mention it earlier since i thought it might not be a big deal, but I think i had some coolant leak out. I check the cap and was able to turn it about half a turn. The drop was more like a lay down and considering no scratches on the side fairing, i dont think theres any damage to anything but the brake lever area.

Do I need to take to the dealer?

Last edited by klev; 01-05-2018 at 11:41 AM.
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post #9 of 23 (permalink) Old 01-05-2018, 03:29 PM
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2 drops? Is this your first bike or do you just have bad luck?

My right rearset has a hole in it that has the switch portruding through it. When the pedal comes up, a tab pushes that switch in and shuts the light off. It sounds like it broke off, if yours is set up like my Monster.

Unplug the switch from the wire harness and see if it shuts off the brake light. If it does then that's your problem.

When I was having trouble with my switch, I just unplugged it. That ended up messing with how my bike operated. The RPM shot up to 4500 and wouldn't go down. I replugged it, cycled the key a few times and oddly the RPM went back to normal. My CEL never came on, though. I know this sounds unbelievable, but I'm guessing that almost all the switches are in communication somehow.
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post #10 of 23 (permalink) Old 01-05-2018, 04:30 PM Thread Starter
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Originally Posted by 1uglybastard View Post
2 drops? Is this your first bike or do you just have bad luck?

My right rearset has a hole in it that has the switch portruding through it. When the pedal comes up, a tab pushes that switch in and shuts the light off. It sounds like it broke off, if yours is set up like my Monster.

Unplug the switch from the wire harness and see if it shuts off the brake light. If it does then that's your problem.

When I was having trouble with my switch, I just unplugged it. That ended up messing with how my bike operated. The RPM shot up to 4500 and wouldn't go down. I replugged it, cycled the key a few times and oddly the RPM went back to normal. My CEL never came on, though. I know this sounds unbelievable, but I'm guessing that almost all the switches are in communication somehow.
Not my first bike, first big bike though. stopping on slopes resulted in both of them. I think the switch is either stuck in or snapped off. I need to get under there to have a look. Checked the spare switch pics and doesn't look like it has a tab, just the pin protuding from the hole. Oddly I don't know why the CEL came on. I'm going to check activating the switch manually by hand and see if that gets the brake light working correctly and fix the CEL. Else it's a trip to the deal.

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