MJ Comanche Tech. Stock & Modified. MJ (86-92)
All discussion regarding the Jeep Comanche, the pickup truck related to the Cherokee platform.

88 MJ brake upgrades?

Old 01-18-2015, 08:54 AM
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Default 88 MJ brake upgrades?

Good morning. new here but not to working on all sorts of things.
Picked up a 88 comanche for son and it's only got the 2.5 but looks like I'll be doing brake work anyhwo.

Are there any larger rotors/calipers from other jeeps that will swap on without any mods? Like say, from a grand cherokee V8.?

I'm not so worried about the rears so far and got a taste of DEATH WOBBLE yesterday. So, if I'm going to be in there messing with suspension, I would like to upgrade the brakes if I could.

Didn't come up with much on the search.

E
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Old 01-18-2015, 09:09 AM
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I found this on 4Wheeler but doesn't state anything on the rotor/calipers etc..

http://www.fourwheeler.com/how-to/tr...stem-upgrades/

Long ago we had a '92 Cherokee Laredo 2wd (that I wish we still had) and it had discs in the rear.
The cherokee's rears will swap right in if I wanted to go 4wheel discs correct?

E
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Old 01-19-2015, 06:48 AM
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Do the booster upgrade it the difference between night and day ....Then consider other upgrades....
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Old 01-20-2015, 07:15 AM
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Originally Posted by freegdr View Post
Do the booster upgrade it the difference between night and day ....Then consider other upgrades....
Absolutely the best bang for the buck/work.

I like using 99 to 2004 WJ Grand Cherokee booster and master cylinder assemblies.
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Old 01-20-2015, 07:34 AM
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The grand cherokee used the same brakes as the mj/xj.There is a bolt on aftermaket kit but its 900 bucks.If you can weld then wj knuckle swap will give you bigger brakes but its not cheap or a bolt on deal.
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Old 01-21-2015, 07:48 PM
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Start with the booster upgrade. Trust me.
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Old 01-22-2015, 02:54 AM
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Im driving this while I'm doing the work for my son so he doesn't have to
be out of a vehicle. He turns 16 in a few days.
I'll take him with when we go to get the steering box setup.
Maybe he'll get more excited about it.

Just replaced everything except the long 'inner' tie rod and dampener.
Had the Death Wobble twice and NEED TO TAKE CARE OF THIS..!!
WTH..? What causes THAT? Its' gotta be more than just the steering dampener.

I've been driving since I've been 6/7yrs old and NEVER had this on a vehicle besides an ol tractor or OLDER trucks..

E
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Old 01-22-2015, 05:55 AM
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Originally Posted by rockosocko View Post
Im driving this while I'm doing the work for my son so he doesn't have to
be out of a vehicle. He turns 16 in a few days.
I'll take him with when we go to get the steering box setup.
Maybe he'll get more excited about it.

Just replaced everything except the long 'inner' tie rod and dampener.
Had the Death Wobble twice and NEED TO TAKE CARE OF THIS..!!
WTH..? What causes THAT? Its' gotta be more than just the steering dampener.

I've been driving since I've been 6/7yrs old and NEVER had this on a vehicle besides an ol tractor or OLDER trucks..

E




My understanding of “death wobble” is this. Somewhere in the vehicle, one or more components is worn beyond tolerances, and when oscillation initiates from a suspension “traumatic” event (hitting a bump or a pothole) or also when a vibration reaches a certain point and harmonic at a certain speed, it causes theother components to react. This is called the “multiplier effect”, where one component affects one or more other components as the event travels through the front end of the vehicle.



Death wobble is not uncommon with the XJ. It is even more common with a lifted XJ. Finding the worn component or components is not always easy. It can sometimes be downright difficult. Sometimes it’s obvious. other times everything appears to be okay when you perform an inspection on a hoist, but getting the vehicle up in the air and going over everything with a fine tough comb is always a good first step. It is very helpful if you know exactly how to perform a comprehensive inspection of every single front end part, looking for abnormal wear and or play in that hardware. If you do not know how to do this type of inspection, pay an experienced professional to do it. Be sure to ask them if they are familiar with “death wobble”, as not all technicians are versed in this…..



Check out the below link if you would like some extensive reading on “death wobble” causes and cures. From my research, Kevin (the author of this tutorial) is possibly the best in the business with tracking down root cause of death wobble. He does offer hardware for sale that can help resolve death wobble, but even if you don’t buy any parts from him, you can still get some excellent ideas on what to look at in resolving your death wobble.



http://www.kevinsoffroad.com/how-to-...-death-wobble/



Possible causes of death wobble are listed below. Isolating death wobble is a process of elimination and the root cause is not always obvious and it can often be caused by a combination of things! From my personal experience, I would first concentrate on the track bar and the control arms and associated bushings.

--------------------------------------------------------

-Front tires out of balance (try swapping fronts to rear and see if symptoms change)

-Tire pressure. Don’t laugh. It’s not a root cause but can exaggerate the problem. Experiment with lower tire pressure to see if it helps

-Improper lug nut torque on wheels
-Front alignment out of spec
-Loose track bar
-Worn track bar bushings
-Worn track bar (check for play!!)
-Bad control arms and associated bushings
-Worn/damaged steering stabilizer (not generally a cause in and by itself)
-Worn/damaged shocks
-Worn/damaged tie rod end
-Bad U Joint
-Bad ball joint
-Loose frame mount
-Steering box loose
-Bad front hub assembly





Tom Walker
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