XJ Brake Booster swap

jcnoble · Jan 18, 2009

Finally got my WJ booster from the junkyard. It was a major pain getting the different
style fittings to work, went thru a few brake lines. But it works great!!! I can actually stop
like a vehicle is supposed to. The tires don't lock up (33") but the Heep stops pretty quickly.
This is a great upgrade for larger tire sizes and older XJ's.

1988 XJ
5" Lift
33" tires
ARB front, Detroit rear...................

Fore Wheeler · Jan 19, 2009

96 xj booster. don't forget to get the pedals too.

this is what I did to my 91.

wbt · Jan 19, 2009

Fore Wheeler said:
96 xj booster. don't forget to get the pedals too.

this is what I did to my 91.

I used a '96 XJ booster for my '92. Other than using a 1/4" spacer behind the booster (and of course new brake lines at the new master cylinder) I didn't have to modify or adapt anything else.

It'll lock up 33's.

bcmaxx · Jan 19, 2009

used from an 03 grand, I can lock up 33's. luv it!

Frank Z · Jan 19, 2009

I used a 98 Booster in my son's 91 XJ. I simply relocated the pin on the brake pedal to avoid another trip to the JY.

jcnoble · Jan 19, 2009

Is that a lock up on pavement with 33" tires? Rear and front?

blk88 · Jan 19, 2009

I did this swap about 6 months ago. I love it! I can skip all 4 on pavement and I'm running 37's. Best mod yet apart from cutting fenders up.

CharlieMopps · Jan 19, 2009

I did the WJ swap and can lock up 33"
Screaching and all. I dunno if its all 4 tires locking up... but something's screeching.

cal · Jan 19, 2009

Fore Wheeler said:
96 xj booster. don't forget to get the pedals too.

this is what I did to my 91.

That won't work on a pre 91, though. For the renix years, you're better off modifying a WJ booster.

offroader461 · Jan 19, 2009

cal said:
That won't work on a pre 91, though. For the renix years, you're better off modifying a WJ booster.

WRONG...i have a 96 booster/master/pedal/brake switch in my 87...works perfectly

CharlieMopps · Jan 19, 2009

But the WJ booster is the same price and a lot better... so why not?

cal · Jan 19, 2009

offroader461 said:
WRONG...i have a 96 booster/master/pedal/brake switch in my 87...works perfectly

I'm wrong .. saying you're better off grabbing a 4 year old booster for $50 and spending 12 minutes with a dremal before installing, than you would be buying a 13 year old booster for $50, pedal for $15, and switch for $7?

Just because you did it doesn't mean another way isn't better for the average user.

PacificEd · Jan 19, 2009

Where are you guys getting prices of $50? Crown, Autozone, junk yard, etc?

There are no WJ's in yards areound here. If I could walk in and buy this stuff new for what you are quoting, that would be the way to go.

offroader461 · Jan 19, 2009

cal said:
I'm wrong .. saying you're better off grabbing a 4 year old booster for $50 and spending 12 minutes with a dremal before installing, than you would be buying a 13 year old booster for $50, pedal for $15, and switch for $7?

Just because you did it doesn't mean another way isn't better for the average user.

No you actually put the WJ booster is the only one that works...read your statement...thats what i read...so i simply stated that the 95/96 booster does work...and i actually spent less on my swap and with NEW parts than for USED WJ parts....i was lucky when i found my booster/master...had only 20 miles on them :laugh3:

CharlieMopps · Jan 19, 2009

Car-part.com

WJ Booster and master cylinder cost me $80
I reused the old lines and fittings... so that was my total cost.

CharlieMopps · Jan 19, 2009

offroader461 said:
No you actually put the WJ booster is the only one that works...read your statement...thats what i read...so i simply stated that the 95/96 booster does work...and i actually spent less on my swap and with NEW parts than for USED WJ parts....i was lucky when i found my booster/master...had only 20 miles on them :laugh3:

20 miles on them /= new

cal · Jan 19, 2009

offroader461 said:
No you actually put the WJ booster is the only one that works...read your statement...thats what i read...so i simply stated that the 95/96 booster does work...and i actually spent less on my swap and with NEW parts than for USED WJ parts....i was lucky when i found my booster/master...had only 20 miles on them :laugh3:

Then they weren't new.

Used is used.

How did you wire up the switch? They aren't the same.

cal · Jan 19, 2009

PacificEd said:
Where are you guys getting prices of $50? Crown, Autozone, junk yard, etc?

There are no WJ's in yards areound here. If I could walk in and buy this stuff new for what you are quoting, that would be the way to go.

www.car-part.com

Enter 2004, jeep grand cherokee, brake booster, and then search. You'll see retarded high prices, go to the bottom of the page. There will be a list of pages, one will have a * by it - that is the page with the lowest listed price. Click there, start scrolling up and calling the shops. They are mail order junk yards, and you can negotiate with them. May not get $50 shipped on the first call, but you will eventually find the deal you want.

johnnyc · Jan 19, 2009

Yes, the 95/96 booster and master swap is an improvement for earlier XJs and MJs. But the WJ swap will provide an even better improvement. This comes from some SoCal people who have done it both ways. So either swap will work.

I have a WJ booster and master on my 92 MJ. Found them in the junkyard for $20. FordGuy made me some new brakelines.

Muddy90XJ · Jan 20, 2009

Can you swap a 98 XJ booster and master cylinder in to a 90 XJ?

XJ Brake Booster swap

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