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Ask an Expert KTM Duke 125 front brake light switch issues Technical

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PaulFargo

Joined:

Oct 12

Posts: 25

PaulFargo says:

KTM Duke 125 front brake light switch issues

I have twice been back to the dealers in the last few months to get this changed, because of the brake light not coming on. I decided to test the old switch once off the bike and discovered it still worked. I realised it's actually the little rubber boot over the switch is not uncompressing due to the cold weather. Is there a spray on lubricant that will stop the rubber becoming affected by these cold winter months?

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  • Posted 2 years ago (14 December 2012 16:42)

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jaffa90

Joined:

Mar 09

Posts: 8930

jaffa90 says:

boot

Never come across a rubber boot return spring,i suspect the internal return spring and plunger are seizing up,not knowing your switch set up have you tried squirting wd40 inside the rubber boot ?

Silicon oil spray or grease will keep the rubber supple.

Have you any pics?

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PaulFargo

Joined:

Oct 12

Posts: 25

PaulFargo says:

switch

yeah it's not a rubber return spring, I guess it's just supposed to be a waterproof cover. I will give the silicon spray a try.Thanks

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Rog990

Joined:

Aug 12

Posts: 1

Rog990 says:

same problem.....

My lad has the Duke 125 and he has had the same problem with the brake switch, KTM changed it 2 weeks ago and its started its problems again already. 

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hawk750

Joined:

Apr 09

Posts: 1920

hawk750 says:

You only

need one brake to work a brake light, as long as the rear brake works the brake light that's fine, just remove the front switch & the lead that runs to it, if it's not fitted it doesn't have to work.


There's never been one on my bike from new :wink:

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jaffa90

Joined:

Mar 09

Posts: 8930

jaffa90 says:

lights

hawk750,is your bike pre 1985?

http://mot.fasttrackmotorcycles.co.uk/25/motorcycle-mot-checks-lights-and-signals/

Check number 3,

All the testers check both levers.

[This Reply has been modified by the Author]

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PaulFargo

Joined:

Oct 12

Posts: 25

PaulFargo says:

ROG990

I sorted this issue, it seems the switch is fine, its the cold weather affects the cover, give it a squeeze then pull the lever, it will probably work. I covered it with silicon grease and so far it's been ok

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sc72

Joined:

Mar 13

Posts: 1

sc72 says:

Re: KTM Duke 125 front brake light switch issues

I had the same problem, KTM have a fix! Simply remove the wire around the rubber boot, remove the boot and throw it in the bin - works perfectly well. The problem is that the rubber stiffens in cold weather.

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