Hydraulic Brake Switch

Message

KitchenSync · #1 Post by **KitchenSync** » Wed Feb 05, 2014 11:19 pm

Rear brake switch has failed so I reckon I'll fit a hydraulic banjo replacement.

Any idea what the measurements for the original master cylinder banjo bolt are? Such a pain to remove it just to measure it.

Ta

D-Rider · #2 Post by **D-Rider** » Thu Feb 06, 2014 12:16 am

Can't answer on the size - it's just the normal banjo size for Brembo kit.

I am using a hydraulic switch - I don't have the option for anything else with my radial master cylinder.
It does have a disadvantage - unless you are squeezing the brakes quite hard, the brake lights don't come on. Gentle braking (or even reasonably rapid braking without too much pressure - as the brakes are pretty good) is often not sufficient to light the brake light.

davebms · #3 Post by **davebms** » Sat Feb 08, 2014 11:20 am

hello all i got a REAR switch from GRIFF , the switch is built into the banjo bolt
just un-do the existing bolt, thread the switch in wiv new copper
washers

davebms

KitchenSync · #4 Post by **KitchenSync** » Sun Feb 09, 2014 11:14 pm

Yup - just bought one from CMC in Nottingham..

FYI it's M10 with a 1.0mm thread pitch NOT 1.25mm

Falco Frank · #5 Post by **Falco Frank** » Mon Feb 10, 2014 5:24 pm

Some have to be wired the 'other way around'...

So dont worry if it does not appear to work without swapping cables over...

or making sure the brake is well bled.

KitchenSync · #6 Post by **KitchenSync** » Tue Feb 11, 2014 7:02 pm

iconic944ss wrote:Some have to be wired the 'other way around'...

So dont worry if it does not appear to work without swapping cables over...

or making sure the brake is well bled.

Glad you mentioned that... I checked it out and indeed the banjo switch contacts are 'closed' by default - so the wrong way round.

No mention of these things working any other way - I can't imagine how it can wired in without having it supply power to a relay which then operates the brake light.

Any ideas?

davebms · #7 Post by **davebms** » Wed Feb 12, 2014 10:14 am

the one i got from GRIFF i think is the standard part for RSV MILLE

its the normal way round

davebms

Falcopops · #8 Post by **Falcopops** » Fri Feb 14, 2014 2:33 am

KitchenSync wrote:
iconic944ss wrote:Some have to be wired the 'other way around'...

So dont worry if it does not appear to work without swapping cables over...

or making sure the brake is well bled.
Glad you mentioned that... I checked it out and indeed the banjo switch contacts are 'closed' by default - so the wrong way round.

No mention of these things working any other way - I can't imagine how it can wired in without having it supply power to a relay which then operates the brake light.

Any ideas?

To reverse the operation you'd need to use the banjo switch to apply a voltage to the coil on a relay that would light the brake light when the voltage was removed by opening the switch with the brake pedal. Simply enough done, but the coil would be energised most of the time and will get hot.

TBH I'd be looking at getting a switch that does what you need it to do, but this pic is how it can be done with the switch you have.

KitchenSync · #9 Post by **KitchenSync** » Fri Feb 14, 2014 9:30 am

Falcopops wrote:
KitchenSync wrote:
iconic944ss wrote:Some have to be wired the 'other way around'...
Thanks for that - what a guy!

I took that banjo switch back yesterday and will prowl around on eBay for a replacement mechanical original - I don't like the idea of them not being very sensitive. I've yet to be tailgaited and would generally like to avoid it.

Ta

Aladinsaneuk · #10 Post by **Aladinsaneuk** » Fri Feb 14, 2014 2:03 pm

coughs quietly

as most of us tend to use the front brake and rear brake combined, then the risk of being rear ended is reduced - the front brake switch works well :)

i have fitted the hydraulic one - being a pessimist I did not use a plug, but had two separate connectors to connect - that way I could change them over easily.... old ducati electrics do that too a chap....

KitchenSync · #11 Post by **KitchenSync** » Fri Feb 14, 2014 2:10 pm

What?

There's a FRONT brake too?

D-Rider · #12 Post by **D-Rider** » Fri Feb 14, 2014 2:12 pm

KitchenSync wrote:What?

There's a FRONT brake too?

I would hope so - given that there isn't much of a rear one!

D-Rider · #13 Post by **D-Rider** » Wed Feb 19, 2014 11:07 am

Doh ..... would you believe it .... my brake pressure switch has just failed

Falcopops · #14 Post by **Falcopops** » Wed Feb 19, 2014 11:19 am

I've used them in the past on an old Suzuki front brake and they would only last about a year. it was a daily commuter bike into London so got plenty of use, but still not very donkey

D-Rider · #15 Post by **D-Rider** » Wed Feb 19, 2014 11:34 am

Mine was second hand when I got it and has lasted somewhat longer than that.

TBH I'd prefer a standard switch but that's not an option with my radial master cylinder.