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Old December 16th, 2016, 09:27 AM   #1
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brake light stuck on

since replacing the rear brake pedal the brake light has been stuck on.
when I turn the ignition on the tail light comes on then almost immediately the brake light.
there doesn't seem to be a switch of any kind for the back brake so does anyone know how it works or how to fix it ?

thanks
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Old December 16th, 2016, 09:32 AM   #2
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There is a little switch down there. Looks kinda like a pin.
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Old December 16th, 2016, 11:20 AM   #3
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Quote:
Originally Posted by kuksul08 View Post
There is a little switch down there. Looks kinda like a pin.
thanks kuksul, found the little blighter, the pin moves but the light stays on so have disconnected it for now. will get it sorted under warranty when it goes in for the 9k service next month (year).
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Old March 6th, 2017, 10:49 AM   #4
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Let me follow up on this since I just had the exact same thing happen to me.

I replaced the rear brake lever a couple of days ago. Yesterday I took the bike out for a spin and during the pre-ride check, I noticed that the light was stuck on. Did you get yours fixed? More information would be very helpful before I tear everything open to try and diagnose the problem. More info on exactly what I did:

Since I didn't have enough room to remove the screw that hold the pin that activates the rear brakes, I removed the exhaust first. Then slowly (read, with little room) unscrewed the back screw, left the pin in the brakes cylinder and proceeded to remove the screw that holds the lever itself.

As I was putting it back together, I noticed that the pin easily comes out, which allows a different removal procedure where you leave the exhaust in its place and just remove the screw holding the lever, and take the pin out, along with the lever, off the bike and replace everything on the new lever off the bike.

Alas, I placed the pin back in its place and screwed the lever to the bike first. Then I used zip ties to hold the return spring high enough to clear the cylinder where it normally sits while I put the back screw back in place. Cut the zip tie and the spring lays where it should. I tightened everything and turned the bike on.

The lever works as expected, engaging and disengaging the rear brake normally, but the light is constantly on. It doesn't change with neither the rear nor front brake lever usage. I have verified that the aforementioned pin goes out of the cylinder as much as it used to before replacement yet the light is stuck on.

It seems like yours was the exact same scenario: the brake (lever, pin, cylinder, pads) was working normally but the light was not. Did you get any information from the Ducati techs?
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Old March 6th, 2017, 01:21 PM   #5
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I Ride: 04 WR450 Supermoto, and 13 Hyperstrada
When your replacing your lever, first thing you have to adjust is the stroke of the Rear Master Cylinder via the turnbuckle which extends from the Master Cylinder (I'm pointing at the turnbuckle). Note that you have to maintain that the Master cylinder arm can fully extend when the lever is in its resting state (you're not touching the lever), otherwise your rear brake won't be able to draw new fluid into the system to account for brake pad wear.



Now you have adjust the Rear Brake light Microswitch via the bolt & nut I'm pointing to. How this is done is, when the rear brake lever is in its resting state, the bolt should just touch the rearset, thus applying inwards pressure to the little black pin that extends from the Microswitch. You can adjust the height of the brake pedal via this bolt as well. If you want the pedal to be lower, then you screw the bolt in so it protrudes farther out the lever. If you made a height adjustment, check the turnbuckle on the master cylinder to make sure it still extends to full stroke.





If the light continues to stay on, then you've probably got a problem with the rear microswitch being faulty and in need of replacement.

Last edited by zibbit u2; March 6th, 2017 at 02:23 PM.
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Old March 7th, 2017, 05:57 PM   #6
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Thanks for the prompt and detailed reply.

I hadn't thought of messing around with those adjustments, given that I didn't change their settings when putting the new lever in but it certainly doesn't hurt to make some changes and report back.

Hopefully that fixes it...
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Old March 9th, 2017, 08:16 PM   #7
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I've got an update for you curious peeps.

I went ahead and did the adjustments suggested above with no luck. I looked around the rear brake pump to try and find something obviously out of place, to no avail.

I then decided to take the rear brake lever out again, mostly to see if the light was still ON with the pin (turnbuckle?) completely out of the pump. Sure enough, the light was still ON without it.

I noticed that there was very little grease and it was pretty dark so I put a dab of grease on the pin and reassembled the lever as I was thinking of other places where I should look; it seemed to me like it would be an electrical fault.

Once reassembled, I checked the travel of the lever and turned the key to the ON position. Lo and behold, the light was working normally again. The problem was that I had failed to put grease on it the first time I replaced it.
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