New Pedal box with 2 brake master cylinders

[Stephane]

Hello,

 

another study i wanted to share with you is my new pedal box

 

I wanted to suppress the brake booster but i wanted to keep a sufficient brake force.

 

I made some search and i found some pics of different solutions

 

 

 

or this one

 

 

or this

 

 

But no solution was exactly what i search

 

so, i decided to built a new one

 

I made a study in 3d

 

first draw

 

 

 

more

 

 

 

I made also lot of paper mockup test

 

after, to finalize the study, i need to bought some equipment

 

 

I  choose also to instal a mechanical repartitor on the brake pedal

 

here the final design

 

 

I keep the standard clutch master cylinder

 

i increase the pedal brake ratio and i keep the standard electric switch for lights

 

I also include a new gas pedal system.  It will work with cable

 

Now, the build

 

 

 

 

test with engine

 

 

new pedals

 

 

the box

 

 

 

Final assembly

 

 

 

 

 

 

 

 

[Ian]

Nice engineering!  My only suggestion would be to use remote reservoirs so you could raise them a bit higher to make servicing easier.

[Tommy]

Nice as well! No experience from use yet?

[Stephane]

5 minutes ago, Ian said:

Nice engineering!  My only suggestion would be to use remote reservoirs so you could raise them a bit higher to make servicing easier.

I think about it.  i found nice tank with 3 compartiments

 

 

but my major concern was the lot of different type of plug for hoses and i did not find something simple

[Stephane]

5 minutes ago, Tommy said:

Nice as well! No experience from use yet?

Thanks!

 

not yet, and if you have seen the state of my rebuild, i will have to wait some months more!! ?

 

[Ian]

33 minutes ago, Stephane said:

I think about it.  i found nice tank with 3 compartiments

 

 

but my major concern was the lot of different type of plug for hoses and i did not find something simple

I think those have hose barb fittings, and you should be able to run a simple hose up the firewall from the master cylinders to the reservoir that bolts to the firewall.  

[MOESPEED2002]

Stephane,

 

I like the way you think! Well done. +1 for Ian's recommendation, remote reservoir would simplify hard line plumbing.

 

Make these boxes available, please. Would speed up my design plan.

 

Thanks

 

Moe

Edited April 12, 2021 by MOESPEED2002

[TobyB]

Nice. 

 

Moving the gas pedal's a good decision.  One of the things I wrestled

with was the size of my feet!  There's so little space down there for a 

size 14, even if you spring for the nice OMP shoes.

 

How will you get the bias adjuster cable in there?  As you saw from my pics,

that made for an... interesting... clutch pedal.

 

And even nicer to change the mechanical ratio.  

 

I'd bet you could sell a few, even just in kit form.

 

I ran the stock reservoir- Tilton supplies an 8mm nipple, and 

some tubing from the VW place, and I was set.  

 

Well done!

 

t

 

[Stephane]

Thanks. 

 

Can you precise what you mean by "bias adjuster cable " you speak about the gas pedal cable ?

 

 

[Mike A]

I think he’s referring to the cable which turns the threaded rod to move the trunnion  so that the front rear bias can be tuned. ......no?

Edited April 12, 2021 by Mike A

[AceAndrew]

That's pretty slick.  Well done.  The debre shield is a nice touch.

[Stephane]

For the moment, i only define how the cable will be move on the pedal box side

 

 

 

 

 

The pedal gas is link to a lever by an adjustable rod.

 

red is a spring

 

blue are the different cable position

 

yellow is an adjustable stop by a screw

 

 

 

i tried to have everything adjustable 

 

 

[uai]

no Toby means the bias bar.

The whole sense of a bias bar is to be able to adjust front/rear brake ratio.
e.g. it makes sense when it's getting wet to have more brake in the rear to get the last .10ths on the track.

If you're not able to adjust without taking a wrench in the hand and taking the pedal cluster apart a proportioning valve by the hand brake lever would be better

 

[Stephane]

OK, i understand

you mean the brake ratio adjustment between front and rear

 

As i don't plan to do lot of race track. I plan only to set a fix ratio between front and rear and not adjustable in live.

 

Maybe it's a mistake, i don't know

[tzei]

If you can squeeze this baby in there somewhere then Toby will be happy.