Brake light not working

masameet

Rawr!
Did I fix this problem correctly?

Today on a group ride up Hwy 1/Shoreline Hwy from Tambucks, I swept behind a newbie. Before we left, the ride leader said the newbie had about 600 miles of riding experience. So when she started making the twisty descent without hitting her brakes, I was astounded. A newbie who already knows about brake-less turns?

But after a while I realized her brake light was just not coming on. Her tail light was working fine. As we made our way up to the stop sign in Stinson Beach, I rode along side her and shouted: Are you using your brakes? She nodded her head and shouted back, Yes. At the brief stop in Pt. Reyes Station to meet up with other riders, I asked her to stand behind her bike while I engaged separately first the front brake lever and then the rear brake pedal. OMG! she said. The brake light's not turning on.

Figuring the problem was a blown fuse, I offered to help fix the problem. So after lunch, thinking we'd find the fuses under her bike's seat, we found only the main fuse and spare. (Her bike's a Yamaha 600 sport bike and the owner's manual was not with the slim tool bag in the rear seat compartment.) (When another rider stopped by and said, I don't know anything about Yamahas either -- I'm a Honda man myself, I lol'ed and said, And I'm a Suzuki gal.) Still at least we managed to get both sets of bolts (the bolts that hold her seat down and the side bolts, with one holding the rear master cylinder to the frame) back in place and without permanently losing a bolt, nut or spacer.

As the others saddled up, I thought about how back in May, in trying to figure out why the Signal Dynamics rear brake modulator on my SV650 kept the brake light flashing without turning off, I discovered the little coupler below the start button. So I reached under her right clip-on and pushed in the coupler there.

Didn't have time to test my idea. But I guess it worked, because on the return trip her brake light started flashing on. And during the group farewell, we tested the brake light again and it worked when both brake lever and pedal were applied separately.

So does the front brake light switch coupler actually affect both brake switches? What else can cause the brake light not to turn on while the tail light stays on?
 

Iceman9r

Well-known member
Brake light working and then not working, then working again.....check the bulb. The bulb could be lose in it's socket OR the brake light side of the bulb is going bad.
Both brake light switches work seprate from each other. If one switch fails the other will bring it on. This of course if the fuse to the tail lights is not blown.

One other thing: If she was riding her back brake, the rear brake light swiitch at the foot brake could be out of adjustment when applied. This will cause the brake light not to come on when used. BUT the front brake would still work and turn on the brake light

Check the easy things first!
 
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afm199

Well-known member
The front brake has a microswitch that is pushed in by lever travel. The connector often comes off and disables the brake light. You got it right. The rear brake pedal has a separate spring loaded switch. It may be disconnected as well. They operate independently.
 

masameet

Rawr!
Thanks, Iceman9r and Ernie!

Honestly I hope her brake light continues to work. Would hate to hear she got rear-ended and then placed at fault for having a non-working brake light.

Yeah, we really didn't have time to check the brake switches (stupid side bolts re-install took practically forever :mad) before making the mad dash back.

I'll email her to check the rear brake switch and point her to online microfiche for Yammies. Don't know if she will though. When I queried her about pre-ride checks, she seemed not to know about T-CLOCS.
 

masameet

Rawr!
motech, it's the part marked with a circled 1 (photo capture from the Chassis chapter of the SV650 service manual):
 

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