Hello guys, quick question
1998 JGC Laredo
42re automatic trans
np249 transfer case
quadratrac AWD
4 wheel disc brakes
4.0l inline 6
Dana 30 front
Dana 35 rear

Jeep runs and drives great, bought from a guy parked at a parking lot. Sat up for a year, transmission slipped, but drove. Took it to a transmission shop rebuild trans, now drives great. Took on highway for first time was good at first.
Then a brake on the passenger side began to grab, off, and on(not while applying the brakes just rolling at speed) pulling Jeep to right side. 1 sec grab, let go, a few secs later grab, and let go again.
Pulled over, could not see any signs of anything. Didn't do it again in city driving. Started home got up to 50 mph, started again this more frequent holding longer, I felt a caliper was about to freeze up, but made it home.
Jacked it up, pulled all 4 wheels, no brake fluid leaking, brakes pads look fine, rotors all turn fine with no dragging. Everything looks good, other than pulling brake while driving.
If you guys have any advice on where to start, or need more info, please let me know, thank you in advance.

 

Are all your caliper bolts in place and tight? Does your caliper glide freely on the caliper bolt bushings?

 

First, Thank you for taking the time to answer. Yes all bolts are tight, all the little boots are there, they move freely. Pads are worn evenly, I see no bare metal scratches. Rotors appear to have even wear no ridge, or deep scoring. Brakes work great, just the issue when driving on highway.

 

Did you check your wheel bearing? Do you notice any type of grinding noises from that area while driving? Your issue could very well be a bad wheel bearing, being that it only happens at highway speeds.

I would check to see how hot that wheel gets.

 

When did you rule out the caliper?

 

I haven't ruled them out yet, I just didn't see anything obviously wrong. I have no clue as to where to begin. Don't want to just start replacing parts. The previous owner replaced the right front caliper last year. Found the receipt in the glove box. I was hoping, (depending) maybe someone here, with the vast knowledge available, could give me a clue as to what might be the culprit. I was planning on changing all calipers, rotors, and brake lines, but would hate to do that and still have the same problem.

 

In my opinion, replacing those parts would be a very good start. Decent parts are very cheap for these jeeps.

Sometimes it can be numerous culprits causing your issue, so starting with a few new parts is a good way to go.