Manual rear brake to hydraulic convertion

here are the measurements.. it has a 6 in pedal with a 2 inch arm...

 

Ok guys the slave and master on on there way did some measering last night of the rear drum arm. From free floating (not dragging) to fully applies is 3/4 in travel. so the slave will have plenty of travel. the master cylinder has a .5 bore from what the seller has told me. but im sick of running number and just want to see if it is going to work. Been number crunching but im missing on major number needed the force it takes to lock the rear brake up... with out that all this number crunching is useless because i don't know the number i need to reach

 

Motion would =force, if the master moves the same as the slave force at the master is the same as force at the slave.
The ratio of m/s and the pedal (6-2 OR 3-1) and the brake arm length should be about the same as the original setup.
I figured that about 1-1, so if motion is 1-1 force is to.
With the 6-2 pedal it was real close with the other size master. But now it changed.

 

ya im going to just see and that is all i can really do... we wil see in about a week.. will have to make a custom hose but i have a hose company very close to me that does that lets hope for the best

 

you can't say it doesn't look cool....

There are a few more pros than i thought there was going to be.. the slave is spring loaded will return when released+++

The fittings on are replaceable and easily removed to allow custom fittings.

perfect size and will sit nicely in the swing arm grove.

the master is on its way from china they say 8-10 day. been 2 hate waiting.

 

Welcome back everyone. Well while the forum was down i received the master cylinder for the conversion. I have done calculation on volume displacement.

Master max Displacement
.20889 cube inch

dimensions
Length .5625
Radius .34375

slave max displacement (pull)
.42965 cube inch

bores
main bore .52632 Minus shaft displacement .09667
total displacement
.42965

length .52632

With the masters displacement it will move slave 48.6% of slave totals travel. which should be .422 travel.

with moving mounting hole on rear lever up i should get the out come i am hoping for. will update once i get time to mess with the set -up

 

Well the line and the parts are together. As one has stated the master is too small i need to increase the master size the concept works great.

 

Seems like a study in "Over-engineering".

Properly maintained and frequently adjusted, the Stock Manual arrangement is foolproof.

This Hydraulic experiment might place you at risk for locking-up the Rear Wheel in a panic-type maneuver.
That could cause a sudden loss of control.

With the Mechanical activating system finely aivedjusted; it would seem that you'd have more control and less variations to need to compensate and adjust for to keep Rear Braking response consistent.

But, it looks nice though.

 

thanks rick. i have to do it because with my rear set i lost my mechanical advantage. and i believe this will help a lot. i don't think there will be alot of ajusting once i get the correct master because i mot changing the rear arm at all just removing the solid bar and replacing it with the slave

 

i have been planning a hydraulic clutch but this is something i hadnt considered, i might do it just for the cool factor but i will let you work out the kinks first.

where did you get your rearsets? i was going to make some this winter but if there is one premade available it may save me some trouble.

anyways glad to see someone else rolling the cafe thing on here but can you update your gallery, i didnt see any of the finish product but maybe my computer skills have something to do with it too.

 

When this is done, ... will you still have Fulcrum and Pedal Height Adjustment?

That's the thing I like about my Max's Rear Brake Pedal.
I can place the Peg and Pedal Height anywhere I want too.
To the front ... back ... up or down.

I have the Brake Pedal comfortably centered.
A tight 3mm free-play.
Brake-light ON after 2mm travel.

Those kind of adjustments are important to me.

 

OK let me see if i can explain the total set up...

1.there is going to be a plate that will allow me to move my pedals around
2. the pedal adapter will have a swivel on it to allow it to fold
3. the master cylander will be mounted directly infront of brake lever
4. linkage between lever and master will have an ajustable linkage.

things i havn't figured out yet. light activation. i will probley get a switch that is activated when released oppiset of the kind we have now. this will allow me to mount it behind the pedal with a contach plate to activate and deactive

i have to find a larger diameter master cylinder than the one i have the seller lied to me about the bore diameter.


hope the pictures help out some. as i get the final parts i will let you all know