BMW K bikes (Bricks)

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1Back to top Go down   Instrument brake warning light. Empty Instrument brake warning light. on Wed Sep 17, 2014 3:23 pm

gunsports

gunsports
Silver member
Silver member
I have a problem which is basically, driving me nuts!

I have a '83, 8 valve, non ABS K100. Instruments were replaced with a later year unit from the UK (MPH) but my 'problem' precedes this fix. Also, the brakes on the bike are in a very good condition. New brake pads front and rear. New brake disk rear (font within 90% of new spec.); new fluids throughout and new master cylinder kit on the rear. Basically, the following:

When I start the bike, the brake warning light comes on. A quick touch to front and back brake levers shuts the warning light off and it stays off. When I switch on the park lights, the brake warning light stays off. When I switch on the main beam, the light comes on and stays on while the main beam is on.

If I delay switching on the main beam for approx 500m of travel; and then switch on, the warning light stays off - sometimes. Or, when it is off and I apply hard brakes; either front or rear, it will come on - or not. 

This little light seems to have a mind of its own. I've looked at the wiring diagrams and the books, but cannot comprehend how the brake warning light and the main beam may be 'connected'.

Connections are clean and sealed. The instrument cluster has been opened and cleaned - and sealed again. This problem persisted before I changed the instruments (bad speedo gears) and is still here - despite my best efforts.

Now I need your expert help.

The rest of the bike? Magnificent! Instrument brake warning light. 502531

    

2Back to top Go down   Instrument brake warning light. Empty Instrument brake warning light. on Wed Sep 17, 2014 6:46 pm

RT

RT
Life time member
Life time member
Exact same problem developing here with my 85 RT. I think mine has something to do with the parking light globe/fitting as it will occur if I start the bike with parker on , but not the main beam. Sometimes. I think my whole headlight assembly is a bit loose and something is moving. Carry a piece of black electric tape to put over the light. (until solved anyway).
Good luck.


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2011 R1200RT
    

3Back to top Go down   Instrument brake warning light. Empty Re: Instrument brake warning light. on Wed Sep 17, 2014 8:17 pm

RicK G

RicK G
VIP
VIP
What I see in common there is the bulb monitoring unit and that the problem is there when the park is on and goes when the main light comes on makes me even more inclined to check the BMU. Yours being an 83 and RTs is an 85 so both have reed relays. I would be inclined to change it for a later type with solid state and go from there.
No guarantees but worth a try.


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

4Back to top Go down   Instrument brake warning light. Empty Instrument brake warning light on Thu Sep 18, 2014 5:26 am

RT

RT
Life time member
Life time member
Thank you Obe Wan, I shall do just that.


__________________________________________________
2011 R1200RT
    

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