BMW K bikes (Bricks)

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1Back to top Go down    The red triangle light on the dash on Mon Jul 30, 2018 7:46 pm

pprince

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I took Dietzie out for a few loops around the block and this light is on.

What does it mean?


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Paul
1984 Honda V65 Magna
1985 BMW K100RT
2011 BMW K1600GTL (gone)
2018 BMW K1600GTL
    

2Back to top Go down    Re: The red triangle light on the dash on Mon Jul 30, 2018 8:23 pm

RicK G

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Emergency flashers


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"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats."  from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

3Back to top Go down    Re: The red triangle light on the dash on Mon Jul 30, 2018 8:39 pm

pprince

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I found the bike manual. It is a rear brake light monitor.

The funny thing is both the tail light and brake light are working.  hmmm....


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Paul
1984 Honda V65 Magna
1985 BMW K100RT
2011 BMW K1600GTL (gone)
2018 BMW K1600GTL
    

4Back to top Go down    Re: The red triangle light on the dash on Mon Jul 30, 2018 8:43 pm

Point-Seven-five

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Are both brake switches lighting the brake light?  That light will stay on unless both front and rear brake switches are closed to light the brake light.  The function tests both the bulbs and the switches that turn them on.  My money is on the rear brake switch being bad.  It's in a nasty place.


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down    Re: The red triangle light on the dash on Mon Jul 30, 2018 8:50 pm

pprince

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@Point-Seven-five wrote:Are both brake switches lighting the brake light?  That light will stay on unless both front and rear brake switches are closed to light the brake light.  The function tests both the bulbs and the switches that turn them on.  My money is on the rear brake switch being bad.  It's in a nasty place.

Perfect! Thanks.

Both brakes work fine but when I pumped the rear brake pedal a couple of times the light went off. The rear switch must have been sticky.

This bike only has 27,655 km's on it. My plan is to flush all fluids and replace the fuel filter. She also needs new tires from age. Her last service was in 1999 at 20,xxx km's other than oil changes. In spite of that the fluids look surprisingly good.

The clutch was nice and light and the tranny clicks snickety up and down the gears.


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Paul
1984 Honda V65 Magna
1985 BMW K100RT
2011 BMW K1600GTL (gone)
2018 BMW K1600GTL
    

6Back to top Go down    Re: The red triangle light on the dash on Mon Jul 30, 2018 9:19 pm

Point-Seven-five

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That's great!  Let's hope that is the most serious issue your bike has, although with the long storage, I would expect that it may have some problems with the fuel system being varnished, particularly the injectors.  It's never too soon to get a good dose of fuel system cleaner in the tank with some fresh fuel.  That is assuming that ethanol hasn't turned the fuel pump mount to black goo and spread it around the fuel tank.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

7Back to top Go down    Re: The red triangle light on the dash on Wed Aug 01, 2018 6:50 am

Woodie

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Well done getting your K!  My bulb monitor is completely intermittent and has been since I picked up the bike a year and a half ago.  The bulbs are fine and I have replaced the rear brake light switch and have checked the front switch more than once.  I believe that some folks have disabled this feature and I am thinking of doing the same since I have never been able to correct it.


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1985 K100RT
52667
"Keep your stick on the ice.  We're all in this together."  Red Green
    

8Back to top Go down    Re: The red triangle light on the dash on Wed Aug 01, 2018 10:38 am

Laitch

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@Woodie wrote:My bulb monitor is completely intermittent and has been since I picked up the bike a year and a half ago. 
Describe how the monitor is intermittent, Woodie.


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1995 K75T 68,000 miles
    

9Back to top Go down    Re: The red triangle light on the dash on Wed Aug 01, 2018 8:06 pm

Woodie

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It will work properly for awhile and then it just won't shut off.  Occasionally it will turn off during a ride when I'm on the brakes.  I can definitely see the light flicker/pulse (and not turn off) when I operate the brakes after I've started the bike.  An intermittent short of some kind in the BMU maybe?


__________________________________________________
1985 K100RT
52667
"Keep your stick on the ice.  We're all in this together."  Red Green
    

10Back to top Go down    Re: The red triangle light on the dash on Wed Aug 01, 2018 8:23 pm

pprince

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Although these K100's are way too new for me my hunch is you still have a switch problem.

One of the nice things about my 84 V65 is that its rear brake monitor light is only on the bulb and the switches work only on the brake light.


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Paul
1984 Honda V65 Magna
1985 BMW K100RT
2011 BMW K1600GTL (gone)
2018 BMW K1600GTL
    

11Back to top Go down    Re: The red triangle light on the dash on Wed Aug 01, 2018 9:31 pm

92KK 84WW Olaf

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If the bulb contacts are poor this light will flicker...........take out rear light and rear brake bulb and clean them well.


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1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 84,600 miles
1983 K100RS 0011175 Fricka 29,000 miles Damn K Pox
    

12Back to top Go down    Re: The red triangle light on the dash on Wed Aug 01, 2018 10:08 pm

Woodie

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I will definitely do those things again but I have cleaned contacts a couple of times, replaced the rear brake switch and thoroughly cleaned (pumped it full of deoxit and worked the plunger) and tested the front brake switch which was not indicating any fault. At the end of the day I have become accustomed to having that bloody red light on a lot.  Lately I've been thinking I might just pop the bulb out of the instrument cluster.  It's definitely not the most important safety feature to me since I check the brake lights the old fashioned way fairly regularly.


__________________________________________________
1985 K100RT
52667
"Keep your stick on the ice.  We're all in this together."  Red Green
    

13Back to top Go down    Re: The red triangle light on the dash on Wed Aug 01, 2018 11:53 pm

Laitch

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@Woodie wrote:It's definitely not the most important safety feature to me since I check the brake lights the old fashioned way fairly regularly.
What sold me on this unit is when the triangle lit in traffic. I pulled over and discovered my taillight was burned out. I replaced it with a spare and rode off.

If you haven't yet, pull the monitor from its socket then clean its terminals and sockets. If you decide to disconnect it, there's this.


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1995 K75T 68,000 miles
    

14Back to top Go down    Re: The red triangle light on the dash on Thu Aug 02, 2018 4:06 am

charlie99

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as olaf says

the near only reason that the indicator comes on during a ride ...after getting going and extinguished ...is that the rear globe holder  or wiring to the globe holders ...could be faulty , or a faulty fuse   don't forget some of the electronics has dual supply .
  

I have seen this exact same thing a couple of times

the first time was due to the socket of the running lamp had become corroded ...a good clean up of both lamp holders  fixed that issue ….but again it happened ...this time due to a flakey globe about to die ...it would come on almost every time but I notices some slight brilliance differentiation ….the globe was turning black inside the glass envelope ...and the filament was jumping about inside the globe ...bright one minute, dull the next …

the circuit actually measures the current going through it to the appropriate globe ...and if it falls low in current draw ...bing the warning lamp is back on …

replace both globes with something of a good brand name ...could be a helpful thing to do
also feel the cable going to the rear lamps ..along its length from the loom to the ducktail , feeling for any distortion especially near the top shock mount

we have seen pinched cables  under that shock mount before ...sometimes causing a short ...sometimes causing a voltage drop because of fractured cables ...meaning that the current draw of the globe cant get to the right level to keep the warning lamp off . at every operation .

good luck with the solve


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

15Back to top Go down    Re: The red triangle light on the dash on Thu Aug 02, 2018 4:14 am

indian036

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The front brake switch is the same as the clutch lever switch (and some but not all rear brake switches). You could try swapping front brake and clutch switches. The lack of ability to dismantle them means that attempts to clean by injecting stuff as not overly reliable. I had exactly the same issue with BOB the Blue Old Bike, and it wasn’t sorted until the switch was replaced. 

As Laitch said, it’s main purpose is to detect a blown bulb, but as they get older, poor connections as Olaf said, and failing switches give the same no-brake-light result so it is a useful thing to keep in place. 

Bill


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Newest toy, slightly non-original
    

16Back to top Go down    Re: The red triangle light on the dash on Thu Aug 02, 2018 1:16 pm

Woodie

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Okay so some early morning diagnostics has revealed the front brake switch to be the culprit.  I ordered a new one last fall to replace it but when I went to do the job I couldn't get it to fail.  I'll pull the tank tomorrow morning, do the swap, and report back.  And yes, this morning it didn't work, then it did, then it didn't  


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1985 K100RT
52667
"Keep your stick on the ice.  We're all in this together."  Red Green
    

17Back to top Go down    Re: The red triangle light on the dash on Thu Aug 02, 2018 8:08 pm

indian036

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@Woodie wrote:And yes, this morning it didn't work, then it did, then it didn't  
I thought that was when you were checking the indicators.   Wink

Bill


__________________________________________________
1985 K100RT  VIN 0028991  My original Very Happy   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Newest toy, slightly non-original
    

18Back to top Go down    Re: The red triangle light on the dash on Fri Aug 03, 2018 6:43 am

Woodie

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Mission complete - new switch is in and all systems are go.  Pprince, thanks for allowing me to hijack your thread.  Twice in the past when I was looking at the front switch I couldn't get it to fail.  

Of all the parts that I want to replace or improve I think fuel line disconnects are now up at the top of the list to install.   Repetition is the mother of all learning and I can get the fairings and tank off quite efficiently now but these would make the job infinitely faster and easier.

Thank you all for encouraging me to deal with this and get it sorted!


__________________________________________________
1985 K100RT
52667
"Keep your stick on the ice.  We're all in this together."  Red Green
    

19Back to top Go down    Re: The red triangle light on the dash on Fri Aug 03, 2018 10:48 am

Woodie

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So I had this thing working repeatedly this morning.  Tank and fairings back on - no longer working.  Repeated and sustained swearing didn't fix it.  I'm thinking now that the problem lies somewhere in the wires between the connection and where that circuit ties into the BMU.  Oyy...


__________________________________________________
1985 K100RT
52667
"Keep your stick on the ice.  We're all in this together."  Red Green
    

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