Will this work? Having Mids and forwards brakes(ABS)

1628 Views 13 Replies 10 Participants Last post by Cabeca de Ferro, May 2, 2019

JoeCam

Discussion Starter · Dec 24, 2018

Trying to figure out if this would work when adding mids to forward control braked bikes.
The brake system is a closed system. Any pressure exerted on the pedal forces fluid though the lines and moves the caliper pistons. Is it possible to add an ABS line from the mid control in conjuction with the already existing front control line ? This could be accomplished by using a double banjo bolt in place of the single one on the front caliper master cylinder. Pressure exerted on the mid control forces fluid through the double banjo bolts and up toward the ABS module. After that system acts as designed. See the diagram attached. Simple drawing just trying to illustrate the idea. Thoughts?

See less See more

Save

1 - 14 of 14 Posts

vegetate

· #2 · Dec 24, 2018

I think the braking fluid will only be pushed into "passive" reservoir trough the master cylinder which is not used currently.

Save

rbabos

· #3 · Dec 24, 2018

vegetate said:
I think the braking fluid will only be pushed into "passive" reservoir trough the master cylinder which is not used currently.

That's how I see it as well.
Ron

Save

Moler

· #4 · Dec 25, 2018

I like your thought but I have to agree that you will fill the front reservoir and not push the caliper.

Save

JoeCam

Discussion Starter · #5 · Dec 26, 2018

OK thanks guys - seemed too easy not to have someone think of this set up before. Now let's think of a hypothetical "work around". Not really comfortable using that term with brakes but what the Hell...

What if a check valve (fluid moves one way - blocked other) gets added between the the banjo fittings and the foward control master cylinder? Step on mid-control pedal - fluid pushes toward ABS module but is blocked from going into forward master cylinder by the valve? I guess you'd need one at the mid-contol master as well if the foward brake pedal is activated? Just thinking aloud so-to-speak.

Edit - wait!!! I think the check valve may not allow the brake pads to expand off the rotor??

Save

vegetate

· #6 · Dec 26, 2018

JoeCam said:
Edit - wait!!! I think the check valve may not allow the brake pads to expand off the rotor??

Exactly. That's why common comon solution is a rod from one pedal to other with single master cylinder.
Less common is separated piston in the caliper. Or even additional caliper.

Save

coastrider

· #7 · Dec 26, 2018

JoeCam said:
OK thanks guys - seemed too easy not to have someone think of this set up before. Now let's think of a hypothetical "work around". Not really comfortable using that term with brakes but what the Hell...

What if a check valve (fluid moves one way - blocked other) gets added between the the banjo fittings and the foward control master cylinder? Step on mid-control pedal - fluid pushes toward ABS module but is blocked from going into forward master cylinder by the valve? I guess you'd need one at the mid-contol master as well if the foward brake pedal is activated? Just thinking aloud so-to-speak.

Edit - wait!!! I think the check valve may not allow the brake pads to expand off the rotor??

Correct! First press would engage brakes and then the fluid would not be able to return to the reservoir when released.

Save

hk_fin

· #8 · Apr 28, 2019

I`m sure there is an old thread somewhere with info on how dual brakes can be made but i can`t find it.
If i remember correctly you need two master cylinders. Brake line from master1 goes to master2 (to where the reservoire would go to) and voilâ.
The problem is how to get a reliable fit to the master2.
Hope someone finds the old thread.

Save

Tie_One_On

· #9 · Apr 29, 2019

hk_fin said:
I`m sure there is an old thread somewhere with info on how dual brakes can be made but i can`t find it.
If i remember correctly you need two master cylinders. Brake line from master1 goes to master2 (to where the reservoire would go to) and voilâ.
The problem is how to get a reliable fit to the master2.
Hope someone finds the old thread.

I did the high pressure to low pressure port mod on my firzt r model. it worked flawlessly

Save

Bufort

· #10 · Apr 29, 2019

I'm sure just having a mechanical linkage between the two is the simplest and best way. Why would you want to make it more complicated?

Save

hk_fin

· #11 · Apr 30, 2019

Sure the mechanical link is the easiest way, for some taste that`s a bit too visible maybe.

Save

Bufort

· #12 · Apr 30, 2019

I think a little rod is neater than an extra brake master cylinder. If you're that keen on keeping it neat too, I wouldn't have two sets of pegs. Good luck however you choose to do it.

Save

shaunm4639

· #13 · Apr 30, 2019

A check valve woudn't work because the fluid would not return to the reservoir when you let off the pedal. The brake would remain locked up. Mechanical linkage?

Save