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post #1 of 12 (permalink) Old 03-06-2019, 12:58 AM Thread Starter
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Brake Switch of Street Twin not working

Hi Friends,

I have a problem with my front brake switch operation. Due to malfunction of this microswitch, my stop light is not working. Has anyone faced this issue? I checked at Triumph service center, they informed me that switch is not a available as standalone part for replacement. I need to change the complete kill switch assembly which costs very high. Can you please suggest where can I get the microswitch for front brake?
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post #2 of 12 (permalink) Old 03-06-2019, 12:25 PM
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Part #12 is the rear bs. It looks to me like the front bs is the same SPDT switch as the rear. Put it in your cart to see the Triumph part #. Then ask your dealer to reference it and see what they say..

Good luck!
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post #3 of 12 (permalink) Old 03-06-2019, 04:53 PM
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T2026285 is the part number for an SPDT switch that fits onto part T2027750 (Bracket, Brake Switch, Front) used on both the Street Twin, Street Cup, Street Scrambler and the Street Triple S (from VIN 803572). Could be the part you're looking for.


Whenever I see a bike advertised with 'a shed load of extras' I often wonder how well it handled with a deckchair, lawnmower, some hose and a rake strapped to it.
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post #4 of 12 (permalink) Old 03-06-2019, 05:17 PM
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I've experienced switches stop working for me several times
The last time was a couple of Summers ago on my 1 year old T120. I o[need up the switch housing and found a spider's nest preventing the contacts. I cleaned that out with a dental pick and some contact cleaner. Before that on other bikes it was dirt and dust. I cleaned that out with some contact cleaner. I also had switches stop working because of ice.

It does not matter where you go, how you got there, or how long it took you, someone on a Triumph Bonneville has done it before you. If you didn't do it on a Triumph, it doesn't really matter anyway.
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post #5 of 12 (permalink) Old 03-07-2019, 12:24 AM Thread Starter
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Thanks a lot for your quick answers. I will try with Triumph dealer once again with the part numbers quoted above.
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post #6 of 12 (permalink) Old 03-18-2019, 09:08 PM
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Hey Im having the same issue. The micro head got broken. Hit me up if you got a solution
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post #7 of 12 (permalink) Old 03-21-2019, 12:06 PM
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Any "after market" parts used?

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post #8 of 12 (permalink) Old 03-21-2019, 01:30 PM
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Have you replaced the front brake lever with an aftermarket one? Sometimes, after market levers are shaped slightly different to stock and will not allow the brake light switch to work properly.
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post #9 of 12 (permalink) Old 03-22-2019, 12:24 AM Thread Starter
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No. I am using stock levers.
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post #10 of 12 (permalink) Old 07-20-2019, 01:35 PM
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I had the front brake micro switch come apart on my T120. I tried to find a replacement switch but couldn't. I even tried looking for the part on suppliers to Nissin as I guess it is their part as it attaches to what looks like their front lever casting. Anyway I took the whole cluster and cables in to the dealer and they replaced it under warranty. I know it is like $500 to replace the whole thing. Not cheap. They got the cluster and loom shipped in 24 hours, great service Triumph - especially all the way out here in Utah, 500 miles from anywhere.

Unfortunately the switch turns the brake light off when closed, so if the switch breaks your brake lights stick on. You can't just rely on the rear brake switch to activate the brake light. Well that was my observation anyways.

I was very careful when reassembling everything, it was easier from looking underneath the bars as it is very easy to damage the micro switch with the brake lever when you put it all back together. I think mine initially broke because the original lever was very rough on the surface where it contacted the switch, so over time it ended up breaking off the nub of the switch from sideways stresses.

I replaced the levers with the Triumph accessories ones. At least the left and right levers are now from the same vendor, unlike the originals it seems. They have very nicely machined surfaces where they contact the brake and clutch micro switches, so much better than the originals. OK, $250 I know, but they are a huge improvement in feel and operation.

I looked closely at the stock T120 levers. They look like the brake one is perhaps from Nissin and the clutch one from who knows where. Very different, very odd.

I just used the word break/brake/broke about 100 times...
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