Brake booster problem, 91 XJ

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paulsaddress5

NAXJA Forum User

Location

Winnipeg, manitoba

• Feb 20, 2008

• #1

I have what I thought was the crappy abs system, the "booster" or something is shot, so I was just going to replace it with the 96 or earlier non abs system. My problem is, I can't seem to find the booster, and I can't get a nut off. One of the nuts holding the master cylinder on is being blocked from being taken off by the thing beaneath in, i think its some sort of ABS controller. Can someone give me advice, and tell me if this system is ok to swap to the 96 or earlier non-abs system.
Here is some pics.

 

Muad'Dib

NAXJA Forum User

Location

Bend, Oregon

• Feb 20, 2008

• #2

Who told you thats a 91???

That definetly looks like a 87-90 RENIX (probably a 90) not a 91+ HO.
You can tell by the TB, Linkage, and throttle cable. Also the EGR valve.

You can also see where the vacuum port on the intake is capped (usually goes to the booster).. very weird. Ive never seen a brake set-up like that.. but i havent seen everything! Maybe thats just the way ABS systems look lol!

 

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bigdaddyjlove

NAXJA Forum User

Location

Atalanta

• Feb 20, 2008

• #3

is it the electric pump system? You can tell by the sound of a pump coming on when the key is turned on. If so, then the "booster" is on the pasenger side near the firewall.

 

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paulsaddress5

NAXJA Forum User

Location

Winnipeg, manitoba

• Feb 20, 2008

• #4

Yes that is exactly what it is. Can I do the swap on this system?? or is this system reliable if I change that "booster" unit?

 

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paulsaddress5

NAXJA Forum User

Location

Winnipeg, manitoba

• Feb 20, 2008

• #5

k yes its not a 91. its a 90. Thanks for the help, but how do i get this MC off?

 

Muad'Dib

NAXJA Forum User

Location

Bend, Oregon

• Feb 20, 2008

• #6

Is there no way to get a socket on that nut? Using long extensions and such?
How about a box/open end wrench?
Is that a stud, or does it go through to the inside?

 

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1990high4x4ltd

NAXJA Forum User

Location

canada

• Feb 20, 2008

• #7

i have same trouble.you need a master cylinder pre 1990 ,brake lines,3/16,a used booster from auto wreakers. remove lines and nuts from under dash,to remove complete unit.it is easy dont take unit apart it is under pressure.

 

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paulsaddress5

NAXJA Forum User

Location

Winnipeg, manitoba

• Feb 21, 2008

• #8

ok so pre 1990. Thanks very much. I got it off via nuts under dash. So the pre 1990 mc and brake booster is simple? just 2 lines and a proportioning valve? I also need the proportioning valve correct?

 

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paulsaddress5

NAXJA Forum User

Location

Winnipeg, manitoba

• Feb 22, 2008

• #9

!!!1 Yes i know. But i got a M/C and booster. Now with this crazyness of crap from that old system there, i can't figure out how this new proportioning valve. It looks like there is one inlet, and 4 outlets. Can someone explain where each one of the outlets is supposed to go. Like from the M/C there is two coming out, but from the looks of this proportioning valve there is only one inlet.