Cutting brake idea

[Dingo509]

So i'm bored and started thinking again.
Do you think it is possible to use 2 linelocks for cutting brakes?
To do this you would have to split rear brackline before it went to the axle then run each line through the linelock before going to the rear brakes.

I have rear disc and an ARB so this is the only way i can think to do it beside adding more lever to the floor.

What do you think?

Dingo

 

[jrsxj98]

I dont see any reason why it wouldnt work. most that I have seen just do the old fashion levers on the floor, tractor style.......

 

[Chris S]

It does work, but you either have to push the brakes and lock the side you want to leave on, or add a pair of hand pumps to engage only one side at a time.

As a side note, Jeep backing plates are NOT strong enough for standard e-brake style cutting brakes. Sooner or later the backing plate distorts and grenades everything inside the drum.

 

[rockwerks]

It does work, but you either have to push the brakes and lock the side you want to leave on, or add a pair of hand pumps to engage only one side at a time.

As a side note, Jeep backing plates are NOT strong enough for standard e-brake style cutting brakes. Sooner or later the backing plate distorts and grenades everything inside the drum.

They are thicker than VW backing plates.... LOL

 

[Eagle]

It does work, but you either have to push the brakes and lock the side you want to leave on, or add a pair of hand pumps to engage only one side at a time.

As a side note, Jeep backing plates are NOT strong enough for standard e-brake style cutting brakes. Sooner or later the backing plate distorts and grenades everything inside the drum.

As Chris said, line-locks don't apply the brakes, they only maintain pressure in the system after you release the peddle. That's not really the way cutting brakes usually operate. And line-locks don't allow you to modulate the amount of pressure. However much pressure you have on the peddle when you hit the switch, that's how much pressure gets held.

Separate levers with their own master cylinders is the correct way to do this.

 

[Ed A. Stevens]

Separate levers with their own master cylinders is the correct way to do this.

Yes, a dedicated rear MC driving through a cutting brake slave cylinder(s) is the only truly effective system.

The E-brake is too weak to provide effective brake bias.

 

[Dingo509]

Yes, a dedicated rear MC driving through a cutting brake slave cylinder(s) is the only truly effective system.

The E-brake is too weak to provide effective brake bias.

Right, but it wouldn't be the e-brake just the regular brakes, in my case i have a D60 rear with disc brakes using a Chev rotor and Caddy calipers with the warn brackets which are very thick and should be able to handle the force.

And yeah i forgot to add the part about locking the line and then appling the brake, but im not in a competition with this rig so time is of no concern. This wouldn't be used on every corner or constantly like in a competition rig, it would be only used occasionally on the tight corners we have here in the PNW.

Most of the trails up here where cut by military surplus cj-2's & 3's. so some cornoers are very tight. I've found a few corners where the only way to get the XJ through is to lift up the back of the Jeep with a hi-lift then push it over. Not very fun.

So i was thinking using this as a last ditch effort before using the jack. Sometime i imagine you could lean on a tree, but somtimes you can't and i'm not into seeing how much body damage i can sustain on a single run.

IIRC summit or jegs had line a line lock for like $40 so with all the other misc items i might be in it $100 total as i have spare parts and other crap stashed everywhere.

So it sound like the general consensus is that it will work.
If i do it i'll post pics and maybe a writeup.

Dingo

 

[DDCxj]

Maybe I'm not thinking straight, but what would the purpose be of having a line-lock for the rear brakes? I can understand the front by why in the rear?

Dean

 

[BrettM]

Maybe I'm not thinking straight, but what would the purpose be of having a line-lock for the rear brakes? I can understand the front by why in the rear?

Dean

if you lock just one rear tire (the tire on the side of the direction you're turning) the whole rig will basically rotate around that tire using either front wheel drive or an open diff (or ARB) in the rear.

 

[Fullsizexj]

wouldn't you have to disengage the ARB for this to work since when the ARB is on, you are basically running a spool

 

[BrettM]

that's what I meant, you need an open diff or maybe a limited slip for it to work well in 4wd. if you have a the ability to do front wheel drive it should work with a Detroit or other locker also.

 

[Fullsizexj]

Thats what I was thinking, I am gonna do some research on the seperate MC thing because it seems the easiest and most reliable way to go

 

[Chris S]

They are thicker than VW backing plates.... LOL

true, but bugs don't tend to have 200 hp or weigh 3,500 lbs.

 

[rockwerks]

that's what I meant, you need an open diff or maybe a limited slip for it to work well in 4wd. if you have a the ability to do front wheel drive it should work with a Detroit or other locker also.

alot of the comp guys use detroits, it works just fine

 

[BrettM]

alot of the comp guys use detroits, it works just fine

but they kick it to front wheel drive, no? if you have power going to the rear diff it will lock and you'll just drag both rear tires.

 

[rockwerks]

but they kick it to front wheel drive, no? if you have power going to the rear diff it will lock and you'll just drag both rear tires.

NOt completely the detroit will still let it roll a bit on the side without the brake on. it will actually drive the tire a tad. which can help, that is of course for those who dont have an atlas or DS disco

 

[BrettM]

the way a detroit works it won't let either tire go slower than the ring gear, but they can also free-wheel faster. so the tire you just locked up has to spin just as fast as the other 3 tires, so what's the point?

 

[Dingo509]

the way a detroit works it won't let either tire go slower than the ring gear, but they can also free-wheel faster. so the tire you just locked up has to spin just as fast as the other 3 tires, so what's the point?

Quicker way of burning up brakes?

This wouldn't work on a auto locker unless you had a way of switching to front drive only. With the rear drive disco'd and then locking the inside wheel the clutch mechanism inside the detroit would also lock the ring gear (which can now be done because there is no power being put to the rear) but the outside tire can and would travel faster than the ring gear, and so the cutting brake works. This is how they do it in Comp with a Detroit.

Dingo

 

[rockwerks]

the way a detroit works it won't let either tire go slower than the ring gear, but they can also free-wheel faster. so the tire you just locked up has to spin just as fast as the other 3 tires, so what's the point?

My bad Boss, Im answering whle doing taxes. not advised.