Topic: Front brake light switch missing

[geosar]

My 1972 Honda CB750 K2 with a K3 motor has had a lot of work done on it over the past decades.

The front brake hydraulic line goes straight to the caliper and the front brake switch wires are cut.  If I were to make this bike ADOT legal, how do I find the manifold which apparently interrupts the brake line and houses the pressure light switch.  I have been unable to locate this set up on line or in my Common Service manual.

Or secondarily, is there perhaps an aftermarket switch I might attach to the front brake lever to activate the rear brake light.  The pedal switch for the rear brake activated the light.

Or should I just forget about the whole thing.

Thank you in advance

George
Arizona

[scottly]

They make banjo bolts with pressure switches built in.

[69cb750]

https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=cb750+brake+junction&_sacat=0&LH_TitleDesc=0&_osacat=0&_odkw=cb750+brake+tee

[bryanj]

You would also need to change to rwo flexi pipes with banjos

[Scott S]

 There are also master cylinders with a brake switch.

[geosar]

Thank you to all.

Apparently my "intense" research pretty much come up short.  I'm not surprised but I appreciate being directed properly.

Lots of experience here and I bow to your knowledge.

onward and now I must learn about banjo bolts and connectors.

Thank you again

George
Arizona

[69cb750]

George,
Lots of banjows - https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=cb750+brake+banjow&_sacat=0&LH_TitleDesc=0&_odkw=cb750+banjo&_osacat=0

[geosar]

My brake line plugs directly into the caliper-no banjo bolt.  Without getting too involved (this is obviously not an area I have explored), can I put the banjo bolt pressure switch directly into the banjo connector on the master brake cylinder?

Thank you

George
Arizona

[scottly]

Yes, you use the banjo bolt switch on the master. BTW, where in AZ are you?

[geosar]

Just down the road in Prescott.  Thank you for the response.  This is my first SOHC project attempt.

[kerryb]

This 78 master cylinder has the brake switch in the housing, actuated by the handle.  A little press-fit switch hidden from view.

https://www.ebay.com/itm/1978-Honda-CB750-Four-H538-1-front-brake-master-cylinder-with-lever/233498235341?hash=item365d9451cd:g:ZzoAAOSwfEJeQU-k&redirect=mobile

[Scott S]

 Look at the 3rd picture on this auction.  It shows the switch on the underside of the master.

https://www.ebay.com/itm/283514666491

[geosar]

Thank you for the advise and help.

I feel the banjo bolt switch will be less invasive despite not being original.

George

[RAFster122s]

Switching to braided stainless steel sleeved Teflon lines is a needed upgrade as your stock hoses deteriorate and start causing issues. It will firm up the brake lever and you will use banjo bolts attaching the lines.