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Modified Tech Discussion Forum for Tech related discussion for Modified XJ's and MJ's.

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  #1  
Old October 9th, 2017, 19:57
mgracer mgracer is offline
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Booster Upgrade

I have a '91 Cherokee and have removed the goofy booster & master cyl.
Exactly what year & model Cherokee has the parts I need to upgrade my brakes & be as bolt-in as possible? I have read a lot of conflicting ideas & would like to know what works best. Thanks!
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  #2  
Old October 9th, 2017, 20:32
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Johnnie Walker Johnnie Walker is offline
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Re: Booster Upgrade

95-up XJ, ZJ, should be plug n pray. WJ booster will work as well

There may be a write up on here somewhere
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  #3  
Old October 9th, 2017, 20:46
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clydefrog clydefrog is offline
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Re: Booster Upgrade

I did a WJ booster and master on my Renix XJ. I did make a 1/4" spacer for mine out of steel so the brake pedal would sit in a good location (cant remember if the spacer was necessary though). other than that it was plug and play. Best brake mod I have ever done!

I also added a Willwood adjustable proportioning valve to dial it in (that was def NOT plug and play).
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  #4  
Old October 9th, 2017, 21:05
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ehall ehall is offline
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Re: Booster Upgrade

95-96 booster is essentially bolt-in compatible (97-up has different pedal setup). If you upgrade the MC at the same time you will need to change the ends of the short lines that go to the distribution block to metric bubble flare. WJ upgrade is also compatible but you will need to clearance the pinch seam on the firewall to have room for the booster.
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  #5  
Old October 10th, 2017, 07:19
Francesco Francesco is offline
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Re: Booster Upgrade

I did the WJ swap on a '90 Renix. No spacer needed, but slight clearancing was required. If I remember correctly, however the newer XJ booster required a windshield reservoir relocation.
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  #6  
Old October 10th, 2017, 08:16
burntkat burntkat is offline
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Re: Booster Upgrade

All of this relocation and the like is exactly why I'm going hydroboost!
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-89 S-10: SAS, D44s front/rear. 5.7L V8. 700R4 with 4L60E upgrades. Built in my driveway.
-90 XJ 4.0, AW4, 231J: Clayton's longarms, RE 5.5" coils, hybrid 6" leaf pack, 33/12.50/15" MTs, Rancho 99012s and 99624s, Tera HD SYE, custom sliders, BW flares. Next: finish front, build rear bumpers, Dana 44's front and rear.
-94 ZJ: Budget boost, 31's. The wife's mall crawler. She's gotten inchitis over my S10 though...
-97 XJ: Son's DD. Mild mods for the new driver.
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  #7  
Old October 10th, 2017, 08:48
mgracer mgracer is offline
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Re: Booster Upgrade

Burntkat, please tell me more about the hydroboost.
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  #8  
Old October 10th, 2017, 09:16
mgracer mgracer is offline
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Re: Booster Upgrade

Should I get a booster, mc, prop. valve, & pedal assembly from a '96 Cherokee or a '98 Grand Cherokee?
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  #9  
Old October 10th, 2017, 12:02
Green XJ Jeep Green XJ Jeep is offline
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Re: Booster Upgrade

Dual diaphragm from a 95-96 XJ is you best option for an easy bolt on.
WJ will work but need some modifications.
If you go the WJ route make sure you get the brake lines from master cylinder to proportion valve. You will need the ends to make new lines.
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  #10  
Old October 10th, 2017, 13:46
Francesco Francesco is offline
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Re: Booster Upgrade

Not a huge fan of hydroboost, lose power steering and lose brakes... I've lost power steering many times
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  #11  
Old October 10th, 2017, 14:03
burntkat burntkat is offline
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Re: Booster Upgrade

Quote:
Originally Posted by Francesco View Post
Not a huge fan of hydroboost, lose power steering and lose brakes... I've lost power steering many times
That simply isn't true.
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-89 S-10: SAS, D44s front/rear. 5.7L V8. 700R4 with 4L60E upgrades. Built in my driveway.
-90 XJ 4.0, AW4, 231J: Clayton's longarms, RE 5.5" coils, hybrid 6" leaf pack, 33/12.50/15" MTs, Rancho 99012s and 99624s, Tera HD SYE, custom sliders, BW flares. Next: finish front, build rear bumpers, Dana 44's front and rear.
-94 ZJ: Budget boost, 31's. The wife's mall crawler. She's gotten inchitis over my S10 though...
-97 XJ: Son's DD. Mild mods for the new driver.
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  #12  
Old October 10th, 2017, 14:17
Francesco Francesco is offline
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Re: Booster Upgrade

That's how it worked on my buddies excursion when we lost the power steering, are there different types of hydro boost?
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  #13  
Old October 10th, 2017, 15:02
Green XJ Jeep Green XJ Jeep is offline
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Re: Booster Upgrade

Quote:
Originally Posted by Francesco View Post
That's how it worked on my buddies excursion when we lost the power steering, are there different types of hydro boost?
The newer ones will have am electric motor back up.
Its been my experience that while the back up does indeed work it doesnt work that well.
Bracking performance is about the same if you stall and have no vacuum going to a vacuum booster
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  #14  
Old October 11th, 2017, 18:14
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spidermikey88 spidermikey88 is offline
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Re: Booster Upgrade

I did the wj booster and master cylinder upgrade on my 87 and it made a huge difference. But like the other guys have said, you have to do a few modifications to make it work. I think it was worth it though and I'm about to do the same thing to another xj I just picked up.

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  #15  
Old October 12th, 2017, 06:59
mgracer mgracer is offline
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Re: Booster Upgrade

Spidermikey88, what mods did you have to do?
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