I don't see why the engine size should effect the brake light switch. Oh, it's probably a non adjustable one too.

 

I have 2005 BMW R12ST. You can swap alot of the parts from it to a GS S LT/RT. I would think the same with the 390s. Maybe/maybe not. Such a simple part and the lack of seemingly support from KTM confuses me. If it was a 2000. Or 2010. I would be like yeah sure… but 2020?

 

Looks like KTM (USA) may be out of stock, but if you want to search yourself online the part number is 28111051000.
A couple of places were showing them as in stock, but not sure how true that is and also I guess you'd want to find a shop that's relatively close to you.

 

I was in mexico beggining of september and i asked the resort if they had a KTM dealership close by. I wouldve bought the part there and took it home to the USA. No such luck.
Thanks again for the help/info. I hope that sourcing parts for it isnt as bad as this one part is turning out to be.

 

Its just part of owning a KTM, has been since they went through their financial issues. I've been waiting for a shift shaft for my '20 390adv for 3 weeks now, no part in-sight at this time either, so it continues to sit at the dealership.

And yes, even the simple parts like a brake switch can be tough to get, seems the parts manufacturing side still hasn't caught up with backordered parts. Having said that, its possible to find another brand for that switch, but because its integrated into the banjo bolt, you'll need to make sure its the correct length, with the proper thread diameter and pitch, as well as having the proper slot for the brake fluid to pass into the bolt and to the caliper. I'd just start looking around online for that part number, several online parts stores seem to have it in stock, such as KTMTwins in SoCal. I've purchased from them before, it ships pretty quick and what they show on their pages seemed to be in stock, at least for what I've bought from them for my 390 in the past.

 

Thanks!! Thats some great info but the background isnt to friendly to know. I didnt know that KTM had issues, the company. Usually a strong name like KTM has some decent backing, but they must be holding on by a shoestring. I bought the bike used. The dealership is trying to get it setup properly. Besides the brake, the shift shaft. Do you see other issues? Watch even the tires are special and i wont get replacements for them either. (JK).

 

LOL! Yeah, no need to worry about the tires, nor that shift shaft, that was a one-off issue I think, never saw another owner post about losing ability to shift past 2nd gear. Surprisingly, the 390 is pretty stout for KTM's lower level bike (yeah, its not a 790 or bigger and not a flagship model). As for other parts, there is supposedly a tsb for the switch stalk but only 22 and up bikes, or something like that. Not much else has been reported to be an issue among multiple owners/bikes.

I believe I got the one bike that's possessed by the devil, as even corporate KTM can't figure out how to fix the ecu errors, or erasing its actual mileage, or breaking the shift shaft, or having an issue with the gauge cluster, or a half dozen other things that's just strange about my bike.

KTM is being rescued by Bajaj, so its not like they'll disappear completely, but until they get their shyte together, parts will be a bit of a wait. At least you didn't have your parts issue a couple years ago! Stuff was on back order for 6-12 months!

 

FWIW, if you get really stuck try searching for an Australian dealer and try purchasing through them. Apparently KTM Australia purchased a large inventory of parts prior to the brown stuff hitting the fan at KTM HQ, and so far (touch wood) parts availability hasn't been too bad down under (New Zealand is supplied by KTM Australia).

 

Be careful if you do order from AUS! With the tariffs, I purchased a cruise control from there a few months ago (for a different bike, not the KTM), it added another almost 200 bucks onto my shipping!

 

Ha! Good point.... I forgot about that small issue!

 

I'm curious, what were the issues behind this switch going out? Did it throw a code for brake switch? I'm 99% positive that its an eletrically-proportional switch, meaning its not just on/off but variable resistance throughout its movement so that the ecu knows how much you're pressing down on the pedal. This makes it impossible to just put any switch in it, as it will have certain resistance points that the ecu understands. They went full-bore on making every switch have a resistive circuit, even the kickstand, so that it knows what's happening with each part. Fun times were had when I spent hours trying to find the resistance of the kickstand's circuit so I could install a bypass switch!

Perhaps your switch isn't actually bad but the ecu needs to calibrate that circuit? Dunno if there's something in their tablet that does this, and I'm sure if it does, your dealership has already done it, but it would be good to know what exactly is wrong with the "switch" for sure.

 

The lead tech mentioned a backyard engineered part. I was against it. If this switch worked brakes/lights and that piece of art they created fails at the wrong moment? Yeah.. no thanks. Make it right. I even asked the kid(iam 55) “if it was yours would you want an OEM part or the work of art”? He flatly says” OEM”. I get it if i had to race the next day sure… or get home and let the home team undo. But local? Yeah hard pass.
I like toying around with bikes and other items, but i want it 100% before i make it worse.

 

They washed the bike. And the tech noticed the switch was broken or broke. I am getting this sidey sense about it. Like its a lemon. I can handle some silliness, i mean i have oddities in bikes before. This? I might just try to walk away.

 

Rear brake switch failing is common on those. Ours went at 30 and 45,000 km, and our dealer had fixed a few other bikes.

However, the fun part is the install! It's almost impossible to get to as it is attached to the ABS control unit which is under the tank, inside the headstock bracing of the upper frame rails, on a little shelf. The 390 Duke uses the same system but has the switch mounted on the master cylinder instead. What our dealer did was disconnect the wires to the broken switch, mount the new switch on the master cylinder, and wire the new switch into the bike by extending the loom from the ABS unit down to the master.

btw this is not the only bike that has issues with these switches, it's reasonably common. My Triumph Trophy had a similar issue from new. Since you couldn't use much rear brake pressure, the switch wasn't put through its range of motion and then wouldn't work with light pressure. So, before I took my bike for its annual safety inspection, and whenever light pressure wouldn't activate it, I'd press really hard on the lever a few times to free it up. Note this doesn't work with the 390, it seems to break completely.