Prop valve for RUbi discs

J

jjvande

NAXJA Forum User

Location

Albuquerque NM 505 burque

• Oct 3, 2003

• #1

Im geting a D44 with rubi discs for the rear. I need to replace the proportioning valve with one from a ZJ. Will one from a 93 work?

is there any difference between the years?

Thanks

 

CharlesS

NAXJA Forum User

Location

Quezon Province, Philippines

• Oct 3, 2003

• #2

Might consider installing a ZJ master cylinder with dual diaphram vacuum booster too !!! Much more positive braking than with the standard early style vacuum booster.

 

J

jjvande

NAXJA Forum User

Location

Albuquerque NM 505 burque

• Oct 3, 2003

• #3

I'd love to and plan to eventually, but i dont have any time. I hear the performance isnt as good, hope it will work in the mean time..

so will the prop. valve from the 93 ZJ work???? I was told that i should at least change that until i get the time to do the MC.

thanks

 

R

RCP Phx

NAXJA Forum User

Location

Phoenix,Az

• Oct 4, 2003

• #4

Did you get your axle yet?
BTW:why are your using 2 different names?

 

CharlesS

NAXJA Forum User

Location

Quezon Province, Philippines

• Oct 4, 2003

• #5

Removing the rubber cup from the existing proportion valve slider will equilize braking fluid to front and rear brakes. Check in the TECH section and look for an article that Mike R. wrote. This will explain in more detail with pictures what I am talking about.

 

J

jjvande

NAXJA Forum User

Location

Albuquerque NM 505 burque

• Oct 4, 2003

• #6

im still waiting for delivery...just trying to get all the little things taken care of so it can go right in.

I changed my name cause I use this name everywhere else.

so taking out this rubber thing will make 50/50 pressure distribution between the front and the back?

what pressure ratio is the stock ZJ valve?

thanks.

 

R

RCP Phx

NAXJA Forum User

Location

Phoenix,Az

• Oct 4, 2003

• #7

What did shipping end up running you?

 

J

jjvande

NAXJA Forum User

Location

Albuquerque NM 505 burque

• Oct 4, 2003

• #8

its going to be 100$ LA to Tucson AZ.

 

J

jjvande

NAXJA Forum User

Location

Albuquerque NM 505 burque

• Oct 4, 2003

• #9

i cant find any tech article with Mike R as an author...

 

R

RCP Phx

NAXJA Forum User

Location

Phoenix,Az

• Oct 4, 2003

• #10

Check out this article!
www.stu-offroad.com/brakeconv/bc-5.htm

 

J

jjvande

NAXJA Forum User

Location

Albuquerque NM 505 burque

• Oct 4, 2003

• #11

thanks!

-J

 

J

jjvande

NAXJA Forum User

Location

Albuquerque NM 505 burque

• Oct 4, 2003

• #12

well, now im not sure what to do..

I have been told to :

1) change the prop valve to a ZJ valve

or,

2)change just the spring in my stock XJ valve to a ZJ spring

or,

3)take out the black o-ring in the stock XJ valve

Which one should i do...I really hate bleeding the brakes

-Thanks

 

XJEEPER

NAXJA Member # 13

NAXJA Member

Location

Wasatch Range

• Oct 4, 2003

• #13

I took the cup shaped seal ring out of mine (89) and it works well. (running the SVO/8.8 Ford disc kit, same as ZJ discs) Of course my braking system will work even better after I install my dual booster, master and ZJ disc/disc prop valve......but unlike some folks, I'm not gonna start a project like that 3 days before Moab.

I say do the cup seal mod until you have the time to do the booster swap. You'll be halfway there doing the ZJ prop valve install anyway, but it's your time.

 

J

jjvande

NAXJA Forum User

Location

Albuquerque NM 505 burque

• Oct 4, 2003

• #14

what do you think will give better results? the cup, or to just replace the prop valve with one from a ZJ?

did you get better than drum performance with just removing the cup, or was it about the same?

thanks

...now if i just had the differential..

 

W

wascobi

NAXJA Forum User

Location

abbotsford, b.c. canada

• Oct 4, 2003

• #15

I just removed the o-ring. xj and zj use different valves but the same m/c

 

D

dave

NAXJA Forum User

Location

dirty Joisey

• Oct 4, 2003

• #16

i run a 44 rear and d30 front.. i still have drums tho. i removed the o ring in the prop valve.. now i can lock up my tires up to about 35-40 mph on 35s... i think you'll be surprized at what a difference removing that little ring makes. HTH

 

XJEEPER

NAXJA Member # 13

NAXJA Member

Location

Wasatch Range

• Oct 4, 2003

• #17

jjvande said:

what do you think will give better results? the cup, or to just replace the prop valve with one from a ZJ?

did you get better than drum performance with just removing the cup, or was it about the same?

thanks

...now if i just had the differential..

Click to expand...

The prop valve from a ZJ with rear discs will give you better performance, but removing the cup makes a big difference.
The performance is much better than with drums out back, the XJ system is biased poorly from the factory, in my opinion. Instead of a 60/40 front to rear, it's more like 70/30 or 80/20. Removing the cup allows a more balanced distribution of pressure front to rear.

If time and money aren't issues for you and you have the parts, then just do the ZJ prop valve, dual booster when you install the D44. If not, removing the cup from your XJ prop valve, along with the rear discs will make a giant improvement over what you had with drums out back.

 

J

jjvande

NAXJA Forum User

Location

Albuquerque NM 505 burque

• Oct 4, 2003

• #18

Thanks, ill just go with the cup for now. then see if I like it. Ive ony got 31s right now, so it sounds like that should be plenty strong.

I'll let youall know how it goes this week

-J