Jerking motion in front end when applying brakes etc
I think it is the subframe front bushing --- how do you replace them -- I have changed the upper/lower front end bushings / shocks bilstein and i have replased the bar bushing with the outer links and the rack $ pinion everything has been replaced but the serial # --- pls assist I am under the immpression that this is a free information exchange site.. If not please repond with your answer
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Re: jerking motion in front end when applying brakes etc
I take it you mean the 2 large round bush rubbers, at front of the sub-frame with the large bolt through the center ?
Usually if they are shot, you can see the splitting in them, if they look OK, I do not think this is your problem
What about the 2 Top front cross member mountings, they have a habit of splitting away from the bonding, and this can give strange jerking problems.
Jack up the car on the cross member, and support the body on the 2 front jacking points, better to remove the wheels, and lower the jack a little, and you should be able to see any problem with them straight away, and see even better if you lever with a large screwdriver.
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I think the clue is in what you are doing. Applying the brakes. The mileage denotes you should have had a least 2 sets of front pads and 1 set of discs by now. When were these last properly checked, and I don't just mean a casual peep under. The thump could be, at this mileage, a bush(es) in the front suspension worn and makes a noise when the front is loaded by applying the brakes. The main thing is, it's not good, and should be checked out immediately.
Have someone start the truck (keep it in park and put the emergency brake on) and have them turn the wheels back and forth from stop to stop repeatedly while you lay under the front end paying strick attention to all of the steering and control components. I had a vertical hopping of the tires going on. I replaced the outer tie-rod ends and upper and lower ball joints. I also replaced my worn mud tires and changed the steering stabilizer/damper out for a rancho 5000 series stabilizer (heavier duty for off-roading). The vertical hop went away. Now I have a side to side wobble. I can recover from it by hitting the brakes, but what works faster for me is jerking the steering wheel side to side a couple of times (from 10 o'clock to 2 o'clock). Never-the-less, it's a serious problem. So, by checking your front end the way I did, you may find the culprit. Don't jack up the front end. Leave it on the ground so the truck's weight affects the system normally. In observing the system while turning the wheel, we found that the front axle was moving side-to-side which drew my attention to the control arm. My control arm bushing (where the control arm joins to the front axle) is heavily worn and moving side to side (around the mounting bolt) approximately 3/4" each direction. Therefore, it's allowing the front axle to shimmy laterally when I hit a bump. I just ordered the new bushing kit from O'Reilly's Auto Parts for $16.00 and it will be here on Tuesday. I'm hoping this will fix my front end as I have already spent $700.00 (and that's doing all of the work myself). It's getting to be an expensive problem. Please let me know if this makes sense to you guys. Seems like a good way to check for worn parts.
I am assuming you mean the rear ones! you neeed to jack up and support the car, as you will be moving the rear subframe support the car on the forward end of the large arms that go to the floor (it is allways solid there) depending on the make and condition of the exhaust you might get away without disconnecting too much of it. support the subframe centrally with a jack, unbolt the 4 nuts and bolts that hold the mount to the subframe, lower the subframe enough to unbolt and change the rubber mounts, if the exhaust or brake flexy stop it dropping enough to change the mounts disconnect them, refit and tighten.
What kind of squeaking - how fast - turning left or right - how hard. Does it go away under any special conditions ie wet, hot, cool etc Applying brakes make a difference When hitting bumps or speed bumps