Author Topic: Front brake works, but brake light doesn't light up...  (Read 3383 times)

Gintonious

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Front brake works, but brake light doesn't light up...
« on: April 24, 2015, 06:25:58 PM »
On my LeMans 3,

When I use my front brake, the rear light doesn't illuminate. It works fine with my rear brake so the light itself is still functioning. Has anyone had something similar happen and is it a quick fix? Hoping to get out on it tomorrow!

« Last Edit: April 24, 2015, 06:57:35 PM by Gintonious »

Offline Testarossa

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Re: Front brake and brake light not working...
« Reply #1 on: April 24, 2015, 06:50:54 PM »
Let's ignore the brake light for a moment. Does the front brake itself work?  The title of the thread implies it doesn't.

If the front brake does NOT work --- you have hydraulic system failure or a ton of air in the line and a more important safety issue than a bad brake light switch.

If the front brake DOES work then you probably have a loose connection either at the brake light switch on the lower triple clamp, or someplace along the wire to the harness BEFORE it joins with the wire out to the tail light unit.
« Last Edit: April 24, 2015, 06:54:58 PM by Testarossa »
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Gintonious

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Re: Front brake and brake light not working...
« Reply #2 on: April 24, 2015, 06:56:59 PM »
Sorry to clarify.

Front brake works just fine, its the brake light that doesn't light when you use it, thats the issue.

Offline rodekyll

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Re: Front brake works, but brake light doesn't light up...
« Reply #3 on: April 24, 2015, 07:10:49 PM »
 . . .and if it doesn't come on, it's a bitch.   :BEER:

redrider

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Re: Front brake works, but brake light doesn't light up...
« Reply #4 on: April 24, 2015, 08:57:56 PM »
Thank god I already swallowed the slug of beer before reading  RK's reply. On your toes, all the damn time.

Gintonious

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Re: Front brake works, but brake light doesn't light up...
« Reply #5 on: April 25, 2015, 12:48:29 AM »
Thanks for the help lads.

Offline rodekyll

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Re: Front brake works, but brake light doesn't light up...
« Reply #6 on: April 25, 2015, 06:14:16 AM »
We're waiting for the results of the wire-touch test.  It's the place to start. 

Online Perazzimx14

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Re: Front brake works, but brake light doesn't light up...
« Reply #7 on: April 25, 2015, 07:55:44 AM »
Heck my Eldorado doesn't have a front brake switch! Ain't that a bitch? :BEER:
I'm overweight but identify as skinny, I'm trans-slender!

dilligaf

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Re: Front brake works, but brake light doesn't light up...
« Reply #8 on: April 25, 2015, 11:36:31 AM »
Pull the two leads from the front brakelight switch and connect them together , if the light comes on it is the switch .

  Dusty

Careful.  ::) Something could blow up.  ;D  :BEER:
Matt

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Re: Front brake works, but brake light doesn't light up...
« Reply #9 on: April 25, 2015, 12:03:59 PM »
Careful.  ::) Something could blow up.  ;D  :BEER:
Matt

 My head did once almost explode once while trying to explain how to wire up a BL switch , the guy couldn't figure out why he kept getting smoke when hooking ground to one side , and hot to the other  :o  ;D

  Dusty
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Online Markcarovilli

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Re: Front brake works, but brake light doesn't light up...
« Reply #10 on: April 25, 2015, 06:57:47 PM »
My head did once almost explode once while trying to explain how to wire up a BL switch , the guy couldn't figure out why he kept getting smoke when hooking ground to one side , and hot to the other  :o  ;D

  Dusty
Kii

Dusty

Some things just can't be fixed......

Mark

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Re: Front brake works, but brake light doesn't light up...
« Reply #11 on: April 25, 2015, 08:23:42 PM »
Kii

Dusty

Some things just can't be fixed......

Mark

 Fortunately this guy is still a friend and has learned to at least pay some attention to my advice . Or maybe he is just humoring me  ;D

  Dusty
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Gintonious

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Re: Front brake works, but brake light doesn't light up...
« Reply #12 on: April 25, 2015, 10:09:07 PM »
Ok, so we found the switch located at the end of the front brake lever, touched the 2 connections and the light lit up, so it would appear its the switch indeed!

Where would I locate one, or will any switch do for this? Or is it the usual MG Cycle or Harper Moto?

Thanks

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Re: Front brake works, but brake light doesn't light up...
« Reply #13 on: April 25, 2015, 10:19:09 PM »
 Not familiar with LM3s . One of you smart guys , does the front BL switch have the little tiny ball bearing in the switch that does the pushing ? Hang on Ginny , the switch might just need a good cleaning .

  Dusty
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Offline guzzisteve

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Re: Front brake works, but brake light doesn't light up...
« Reply #14 on: April 25, 2015, 10:26:01 PM »
Not mine, stock.  Don't work either after hitting the Volvo.

Switch should be on master where the line starts.
« Last Edit: April 25, 2015, 10:30:50 PM by guzzisteve »
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Re: Front brake works, but brake light doesn't light up...
« Reply #15 on: April 25, 2015, 10:34:32 PM »
Switch should be on master where the line starts.

Do these LMIIIs have the micro switch on the master cylinder, like the later bikes? 
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Offline guzzisteve

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Re: Front brake works, but brake light doesn't light up...
« Reply #16 on: April 25, 2015, 10:38:27 PM »
No, old style pressure switch.
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Offline Triple Jim

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Re: Front brake works, but brake light doesn't light up...
« Reply #17 on: April 25, 2015, 10:46:36 PM »
..little tiny ball bearing in the switch that does the pushing...

Bearing ball, not ball bearing!

 :)
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Offline rodekyll

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Re: Front brake works, but brake light doesn't light up...
« Reply #18 on: April 26, 2015, 12:31:12 AM »
The usual suspects or NAPA, depending on your hurry.  If NAPA, take the old one in (plug the hole) for a positive match.

Offline redrider90

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Re: Front brake works, but brake light doesn't light up...
« Reply #19 on: April 26, 2015, 12:58:28 PM »
Bearing ball, not ball bearing!

 :)



Ya and it will fall out if you are not careful and roll somewhere where you cannot find it if I remember correctly.
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Gintonious

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Re: Front brake works, but brake light doesn't light up...
« Reply #20 on: April 26, 2015, 01:30:01 PM »
Thanks again guys, much appreciated.

What exactly is the name of the part? When I search for rake switches I get control switches as results, which isn't what I am looking for.

Thanks
« Last Edit: April 26, 2015, 01:33:39 PM by Gintonious »

Offline Testarossa

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Offline mtiberio

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Re: Front brake works, but brake light doesn't light up...
« Reply #23 on: April 26, 2015, 02:30:30 PM »
"Front brake works, but brake light doesn't light up..."

I consider this a feature, not a bug. For two reasons,

1) if I am trying to outrun the cops at night or anytime, I might want to be able to brake to dart down a side street/alley/country dirt road/hedgerow without signaling the fuzz, and

2) If I am making a left turn on a suicide type corner. Where you have 2 lanes in each direction, no median, only painted lines, high speed limit and no turn lane. If I want to go left (like onto my street). You can bet I am braking with my front that does not turn on the brake light, and then I am flashing the brake light furiously using the foot brake because you can probably bet this bike doesn't have directionals either, in which case I am also furiously hand signaling and looking in my mirror to see if I'm going to get rear ended. Tip: keep wheel pointed toward the front until ready to go...  8^))

Offline Testarossa

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Re: Front brake works, but brake light doesn't light up...
« Reply #24 on: April 26, 2015, 03:17:21 PM »
German made? SBS is Danish and makes brake pads. If they're selling German electromechanicals maybe they're from Bosch?
70 Triumph TR6R, 74 850T, 74 Yamaha TA125, 83 XR350R, 89 Mille GT, 99 F650,
Gone: 59 Piper Comanche 250, 69 Harley/Aermacchi 350SS, 71 Honda CB500/4, 74 Laverda 750 SF2, 91 Suzuki VX800, 50cc two-stroke scoot

Vasco DG

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Re: Front brake works, but brake light doesn't light up...
« Reply #25 on: April 26, 2015, 04:24:03 PM »
Sweet, thanks!

Saw this as well? German made, always sounds good to me.

http://www.ebay.com/itm/MOTO-GUZZI-LE-MANS-SEE-LIST-BELLOW-REAR-STOP-BRAKE-LIGHT-SWITCH-CM-73-/191554806681?pt=LH_DefaultDomain_3&hash=item2c998e6399&vxp=mtr

Neither of those will work because for the un-linked front brake the switch is also the banjo bolt that holds the brake line to the master cylinder. The required switch has a longer shank with a cross drilling in it for fluid delivery to the banjo. You will need the switch and both sealing washers.

Note that if the brake lines are the original black 'Rubber' type they are now over thirty years old. I'd consider replacing them at the same time as the switch. All of 'em. Front and linked system.

Pete

Offline mtiberio

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Re: Front brake works, but brake light doesn't light up...
« Reply #26 on: April 26, 2015, 05:51:07 PM »
http://www.jpcycles.com/product/240-534

Google is your friend

This is not guzzi 10x1 thread,  but they have that too.
« Last Edit: April 26, 2015, 05:51:57 PM by mtiberio »

Offline rodekyll

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Re: Front brake works, but brake light doesn't light up...
« Reply #27 on: April 26, 2015, 06:05:17 PM »
Quick thought -- the brake switch contacts often get dirty/soft.  You might save some time and $$ by making the spades shiny and testing with an ohm meter.  If pumping the lever makes the ohm meter twitch, your problem is dirty connections.

Offline Testarossa

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Re: Front brake works, but brake light doesn't light up...
« Reply #28 on: April 26, 2015, 07:08:50 PM »
Quote
Note that if the brake lines are the original black 'Rubber' type they are now over thirty years old. I'd consider replacing them at the same time as the switch. All of 'em. Front and linked system.
:+1
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Gone: 59 Piper Comanche 250, 69 Harley/Aermacchi 350SS, 71 Honda CB500/4, 74 Laverda 750 SF2, 91 Suzuki VX800, 50cc two-stroke scoot

Gintonious

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Re: Front brake works, but brake light doesn't light up...
« Reply #29 on: April 26, 2015, 07:33:44 PM »
Brake lines are steel braided now, not original.

 

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