BMW K bikes (Bricks)

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1Back to top Go down   Brake Light Empty Brake Light Thu Oct 08, 2015 12:13 pm

JGT

JGT
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Checking the bike over prior to its MOT tomorrow I noticed that the rear brake light would not come on until the front brake light had first been activated, bike static on the stand. Normally when I ride of I activate both brakes to clear the red triangle, probably applying the front first. Is this normal? John


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1992 K75RT  1979 IZH Planeta3
    

2Back to top Go down   Brake Light Empty Re: Brake Light Thu Oct 08, 2015 2:33 pm

92KK 84WW Olaf

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The warning triangle needs both brake switches activated to go out. doesn't go out on just one.

But I never noted that the rear brake light didn't work until the front was activated. Makes me wonder is the rear switch faulty because my rear switch went faulty and it would clear the triangle but not make the brake light activate. Then it stopped clearing the red triangle. 

By force of habit over many years before I ever take a bike [or car for that matter] out I use both front and rear brakes to make sure they are working as in have hydraulic pressure and no air.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 39.885miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

3Back to top Go down   Brake Light Empty Re: Brake Light Thu Oct 08, 2015 3:13 pm

Born Again Eccentric

Born Again Eccentric
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k100virgin wrote:Checking the bike over prior to its MOT tomorrow I noticed that the rear brake light would not come on until the front brake light had first been activated, bike static on the stand. Normally when I ride of I activate both brakes to clear the red triangle, probably applying the front first. Is this normal? John

Normal - no. 

As far as I can tell, the front brake and rear brake switches are connected in parallel to the bulb monitoring unit, so it doesn't matter which brake is operated first to make the brake light circuit. 

As Olaf says, you need to operate both brake levers to make the warning triangle go out (or start flashing, if you have ABS, until the ABS speed sensor does it's thing when you move off).

Out of curiosity, I went out to the garage to check... 

Gretel:

  • ignition on, front brake applied - brake light illuminated.
  • rear brake applied - brake light illuminated and warning triangle starts flashing


ignition off

  • ignition on, rear brake applied - brake light illuminated.
  • front brake applied - brake light illuminated and warning triangle starts flashing


Heidi:

  • ignition on, rear brake applied - brake light illuminated.
  • front brake applied - brake light illuminated and warning triangle starts flashing


ignition off

  • ignition on, front brake applied - brake light illuminated.
  • rear brake applied - brake light illuminated and warning triangle starts flashing


Sounds like you have a dirty rear brake switch connection - giving sufficient continuity to clear the bulb monitoring unit, but not enough to take the higher current needed to illuminate the brake light. Again, just as Olaf describes his previous failure.

Good luck


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Brake Light Uk-log10 Brake Light Sco-lo15Brake Light Eu-log10
                              Paul  Brake Light 905546712

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 61,000 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (58,500miles and counting....). Cat C Insurance write-off rebuild Feb 17
"Donor" K100LT 1990 (Red)  (VIN 0178091 Engine No. 4489 2024) - 6th & final owner (crash write-off now donor bike).   June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

4Back to top Go down   Brake Light Empty Re: Brake Light Thu Oct 08, 2015 4:12 pm

92KK 84WW Olaf

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The brake light switch for front and rear brakes and for clutch/starter are the same so you could swap one to check.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 39.885miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

5Back to top Go down   Brake Light Empty Re: Brake Light Thu Oct 08, 2015 4:34 pm

Inge K.

Inge K.
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@92KK 84WW Olaf wrote:The brake light switch for front and rear brakes and for clutch/starter are the same so you could swap one to check.


Not on a K11


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

6Back to top Go down   Brake Light Empty Re: Brake Light Fri Oct 09, 2015 7:18 am

92KK 84WW Olaf

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@Inge K. wrote:
@92KK 84WW Olaf wrote:The brake light switch for front and rear brakes and for clutch/starter are the same so you could swap one to check.


Not on a K11

Mea culpa.

I read the K100 bit but didn't read the footer that clearly says K1100.......


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 39.885miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

7Back to top Go down   Brake Light Empty Re: Brake Light Fri Oct 09, 2015 8:50 am

JGT

JGT
Gold member
Gold member
It passed its MOT today without a problem, back brake light working every time so still none the wisher as it why it malfunctioned. 
Sadly I don't need such a big heavy bike any more so its now on Ebay. John


__________________________________________________
1992 K75RT  1979 IZH Planeta3
    

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