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Discussion Starter #1
I just got a 1978 Honda CB400T II and have a question about the front brake light switch. The rear brake activates the brake light, but the front one does not.

Basically, I can't find it anywhere on the brake lever, nor can I find the connectors for it. Looking at the bottom of the brake lever, I see two bolts. One looks like the hinge point for the brake lever. The other one is just a bolt with no apparent purpose. At the moment, I am assuming that a hydraulic-pressure-based switch was once there but was removed (see picture)

Bottom of brake lever.jpg

What switch do I need for this brake lever? Where do I connect it to the harness?

Thanks!
 

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F14413004.gif

Looks like it is #1. Goes on the front side.
 

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Discussion Starter #3
That is the diagram for a 1978 Honda CB400T II, but I think my brake lever is different. Even if I bolt a switch like that to the bottom of the master cylinder, I don't see how it's button will be activated when the brake lever is pressed.

I suspect that this is what the switch should be if it's hydraulic-sensing?

Could the brake master cylinder be from another model where the hydraulic-sensing switch was in a different spot long the brake line?
 

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Follow the brake line down to the splitter, see if the pressure switch is on the splitter like #4, #1 is the pressure switch.

F24375002.gif
 

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Discussion Starter #5
No, there is nothing like that, though the diagram explains the potential absence of a switch on the master cylinder. My brake line goes directly to the caliper in one shot. I did find the connector for the brake switch - two wires coming off the starter/kill switch assembly, and it works, so that's good news.

I am considering two possibilities: a new brake master cylinder/clutch lever kit that includes the switch, or a banjo bolt pressure switch combo.. Which one is better? Do I have other options?
 

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Cool, I haven't seen one of those.
 

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Update: Got this banjo bolt installed and connected to the two wires coming off the starter switch assembly. Bled the brakes and all is good!
That is pretty neat! Good on you for finding it!!!
 
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