My truck has developed quite a wobble but only during deceleration.
I can accelerate from 0-80mph and its as "smooth" as its always been, but when I decelerate and apply the breaks between 40 and 30mph the whole truck hops and wobbles. I checked the front breaks, still got 90% pad left and rotors look good. I just had my wheels balanced and rotated earlier this week and its still doing it.

Anyone have any ideas?

 

the king pin bushings could need replacing?

 

check for play in front end components. could be a number of things.

 

Yeah, and whatever you do, I'd avoid any more 80mph test runs until you get it fixed!

 

How does it act when you slow down without touching the brakes ??


A rotor can be warped and it still look good.


It is possible that whoever rotated the tires warped a rotor (or both), especially if they were using one of those air-impact wrenches; I wish they would outlaw air-wrenches or make these bozo's go to a five-year school before they could work on vehicles with them.

 

Ive never heard of that. How does an impact warp a rotor?

 

more force or tourqe on one stud vs the others

 

anytime my truck goes to the shop (inspection about the only time) i make sure i check all the lugs for being over tightened.

 

As said above it could be caused by any worn out joint on the front end. With mine it ended up being the tie rod ends. Just touchin the brakes will set it off.

 

i had a wobble right around 40-50 and it ended up being the drivers side tie rod end.

 

I had the same problem with mine not to long ago, and it ended up being a warped front right rotor. did you put your hands around the backside of the rotor to check for uneven wear that could have caused it.

 

It is all too common and happens all the time.

Too many people get ahold of an impact-wrench and think they are on an INDY pit-crew.

They will ZINGGGGGGG one nut at a time, as tight as the gun will put it, before going to the next stud, right beside the over-torqued one, then ZINGGGGG---squeeze the water out of it, and so forth and so on.


It is not hardly so bad if they will at least go in a star pattern, but most of these dimwits will get lost if they do it any other way than just follow the circle.



To my knowledge, an air-wrench has NEVER been on the nuts/studs of my truck since I have owned it; I am adamantly against their use on my personal stuff.

We have been in the tire-shop business all of my life and I have seen it all; were it up to me, the air-guns would be locked in a cabinet, only to be used when all else has failed; when things are that bad, it is gonna take new studs/nuts to fix it anyway.

 

Other items to check.

Steering box coupler.

Front cross member the spring hangers are mounted to. The rivets like to work out.

Front and rear spring eye busings, don't forget the ones in the frame on the rear hangers.

Cracked steering box mounting plate. Also cracked frame in the same area.

A bent rear axle housing will give the same syptoms also.

 

Well I took it for a spit today and it does not wobble when normally declarating but when the breaks are applied it wobbles. I guess that is another arrow pointing towards rotors?

That makes me a bit upset, those rotors are fairly new.

 

I had a bent rear axle causing that on my truck when I got it.