my jeep does not have abs and I have lots of pad and rotor left on all four sides. but the past two times I have had to mash the brakes hard my jeep darted to the left then the right and I almost rolled it. What can I look at that might be causing the problem? It scarel the crap out of me.
jeep darts when braking almost rolled it
DUGA BOY
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let us know what happens... I have the same problem just think it's my calipers seized..
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4,191 Posts
PROBLEM FIXED...... for now......
So I decided to get a head start at this and really went over the front steering components as most mentioned. As Jerry suggested, I looked at the front track bar and tested the bolt on the passenger side mount. Come to find out, it was barely bolted on! After a couple torque rotations the bolt completely snapped. I replaced the bolt and torqued it down to about 50 ft lbs. The track bar bushings were still in good shape :thumbsup:
Then I looked at the stabilizer shock. Both mounts were completely loose and had a lot of play. I decided to remove the old rancho stabilizer shock and replace it with my new RC 2.2 stabilizer. After I removed the shock I noticed it was almost completely seized. I tried moving the piston in and out and it was near impossible. It would barely slide in or out and catch at different extensions. I threw on the new stabilizer shock and replaced all the mount bolts and torqued them down tight.
I inspected the bolts on all other connections (tie rod, control arms, DPA) and they were all snug. I took it out for a test run and really noticed a HUGE difference with the way the steering handled and felt nice and tight. I tried to recreate the bad behavior pull to the left by slamming on the brakes and pulling the wheel left and right and it behaved better then it ever did! Absolutely no pull whatsoever. I still feel a little wander while driving above 55 but I'm guessing this is from poor caster and toe angles.
I'm still going to replace the brakes tomorrow since I know the front left and rear drums catch from time to time and are pretty worn out anyway. After I finish the lift I'm going to get the toe angles aligned and have everything re-inspected.
I'm still on the lookout for something else that might have contributed to the pulling behavior but for now this has dramatically made things a lot better. My guess is that both track bar mount bolt and badly seized stabilizer caused the majority of the problems for me. I will keep updates on anything else I find.
Thanks you ALL again for your time and advise!! :thumbsup:
So I decided to get a head start at this and really went over the front steering components as most mentioned. As Jerry suggested, I looked at the front track bar and tested the bolt on the passenger side mount. Come to find out, it was barely bolted on! After a couple torque rotations the bolt completely snapped. I replaced the bolt and torqued it down to about 50 ft lbs. The track bar bushings were still in good shape :thumbsup:
Then I looked at the stabilizer shock. Both mounts were completely loose and had a lot of play. I decided to remove the old rancho stabilizer shock and replace it with my new RC 2.2 stabilizer. After I removed the shock I noticed it was almost completely seized. I tried moving the piston in and out and it was near impossible. It would barely slide in or out and catch at different extensions. I threw on the new stabilizer shock and replaced all the mount bolts and torqued them down tight.
I inspected the bolts on all other connections (tie rod, control arms, DPA) and they were all snug. I took it out for a test run and really noticed a HUGE difference with the way the steering handled and felt nice and tight. I tried to recreate the bad behavior pull to the left by slamming on the brakes and pulling the wheel left and right and it behaved better then it ever did! Absolutely no pull whatsoever. I still feel a little wander while driving above 55 but I'm guessing this is from poor caster and toe angles.
I'm still going to replace the brakes tomorrow since I know the front left and rear drums catch from time to time and are pretty worn out anyway. After I finish the lift I'm going to get the toe angles aligned and have everything re-inspected.
I'm still on the lookout for something else that might have contributed to the pulling behavior but for now this has dramatically made things a lot better. My guess is that both track bar mount bolt and badly seized stabilizer caused the majority of the problems for me. I will keep updates on anything else I find.
Thanks you ALL again for your time and advise!! :thumbsup:
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4,191 Posts
I just washed the jeep and pulled out of the lot and started heading down the road. 1st time I hit the brakes the driver side caliper grabbed and locked up the wheel, but I did not get pulled left like I use to! I'm now pretty convinced this issue is resolved for me :thumbsup:
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4,191 Posts
You should check the bolts to make sure they aren't loose and also check to see if there's any play when you pull on them or move the tires left and right. If you have a DPA I'm guessing that Jerry was right and that's what's causing your issues.
Also check to see if your shock stabilizer is seized up like mine was... just an idea.
Finally, the answer to my much earlier question and suspicion that you have a dropped Pitman arm which should never have been installed. As I mentioned way back, I believe your problem is due to that dropped Pitman arm. As you hit the brakes hard, that forces your front suspension to compress then decompress which with bump steer caused by a dropped Pitman arm, cause your steering to be forced left/right.
A 3" suspension lift has no business with a dropped Pitman arm, it just usually causes bump steer unless a dropped upper trackbar mount has also been installed which I seriously doubt has been done with only a 3" lift. Bump steer is caused by improper geometry between the drag link and track bar which is caused by dropping the Pitman arm which lowers the upper end of the drag link. That takes the drag link out of its parallel relationship with the track bar which is what causes bump steer.
Find and install an OE non-dropped Pitman arm and I'm betting your problem will go away and you will notice straight-ahead handling from the Jeep over bumps/dips on the road too.
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