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Old 09-13-2018, 06:06 PM   #1
TSpradlin
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Default I got a truck issue need help

Ok here is the truck.

1999 Ford F-350 4x4 4 door long bed 4 inch pro comp lift single wheel.

Here is the issue I need help with.

While driving the truck rides fine. But when I am breaking the rear of the truck will start to bounce and the front will start to shimmy when the truck slows to 40 mph. It stops when I get to about 25 mph. Again it only does this while applying the breaks.

What I have replaced.

Breaks all the way around shocks all the way around and new rear springs.

Anyone have any suggestions on what else I can do? Has anyone else had this issue?
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Old 09-13-2018, 06:11 PM   #2
Huntindad
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When you say brakes...pads only ? pads and rotor? sounds alot like warped rotor.
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Old 09-13-2018, 06:11 PM   #3
Puggy625
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When you say brakes, does that include rotors? That's my first guess. Along with a possible sticking caliper.

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Old 09-13-2018, 06:12 PM   #4
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Man I’m just guessing here but are the rotors trued up and the wheels balanced with good rubber on em? Good luck!
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Old 09-13-2018, 06:13 PM   #5
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Have your tires balanced. Did you just replace the brake pads or did you also have the rotors smoothed out? We had the same issue years ago on an expedition. Turned out the rotors were not even. Just take them to a local parts store or brake shop and they could do it on the cheap.
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Old 09-13-2018, 06:20 PM   #6
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I am with the rotors or tires group
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Old 09-13-2018, 06:22 PM   #7
Mike D
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Sounds like your rotors are toast.


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Old 09-13-2018, 06:27 PM   #8
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If it only does it when you brake, its brakes. Need to do a complete brake job. Odd that brakes are all bad at the same time. You sure the front shimmy isn't causing the rear to hop, or the rear hop causing the front to shimmy? It could be u joints in the rear as well.
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Old 09-13-2018, 06:32 PM   #9
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You driving on the original ball joints and tie-rod ends? Check 'em!


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Old 09-13-2018, 06:52 PM   #10
TSpradlin
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New pads new rotors new calipers all new ball joints tie rods track bar all new up front except for springs and they are going on next weekend.

Also new tires and they are balanced
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Old 09-13-2018, 06:53 PM   #11
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Quote:
Originally Posted by Mike D View Post
Sounds like your rotors are toast.


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I would bet your rotors are warped. It will make a truck shake and bounce when the brakes are applied to it. Just had the rotors on my work truck a f-150 replaced. Fords are known for this too.

A brake or front end shop should be able to tell you whats going on
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Old 09-13-2018, 06:54 PM   #12
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Ball joints are gone, jack up frontend and start trying to shake things around and see what moves.
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Old 09-13-2018, 06:56 PM   #13
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Oh I just saw your last post. It sounds like you have replaced everything I can think of that would cause this.
You would think if it is front end alignment it would do it all the time. Bad tire it would do it all the time.
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Old 09-13-2018, 07:08 PM   #14
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Yea I am at a loss
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Old 09-13-2018, 07:12 PM   #15
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Did this problem start before all the parts were changed or after?
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Old 09-13-2018, 07:16 PM   #16
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Something with the ABS (speed sensor or control module perhaps)? If the ABS was causing the breaks to pulse it might cause shaking.
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Old 09-13-2018, 08:17 PM   #17
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This issue started before all the work was done.
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Old 09-13-2018, 08:25 PM   #18
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While I am at her she is. Maybe someone will recognize her. When I bought her the TBH sticker was already on the rear window.
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Old 09-13-2018, 08:28 PM   #19
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Finally got a pic to upload
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Old 09-13-2018, 08:39 PM   #20
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What about front axles and bearings?
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Old 09-13-2018, 08:46 PM   #21
TSpradlin
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Checked them and they seem to be good
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Old 09-13-2018, 09:01 PM   #22
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Quote:
Originally Posted by TSpradlin View Post
New pads new rotors new calipers all new ball joints tie rods track bar all new up front except for springs and they are going on next weekend.

Also new tires and they are balanced
Did you install or a shop? Throwing ideas out here, I wonder of the rear spindle bearing seated right? Maybe when the rotors were replaced some dirt or gunk got caught between the rotor and mounting surface? Maybe try jacking each wheel up and rotate to see if it turns true and check for slack shaking tire/rim top to bottom and side to side? Were the leaf spring bushings changed when the new rear springs were installed? What about checking the axle ubolts to see if they are tight? Got to be some slack or something out of round or not true to cause this I would think.
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Old 09-13-2018, 09:29 PM   #23
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New bushings and new ubolts no wobble in the axle or and the wheel Everything looks to tire true. I have been scratching my head for weeks on this thing.
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Old 09-13-2018, 09:43 PM   #24
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Front end components. ABS?? Is your torque convertor unlocking??? Get it up to 50-60, throw it in neutral, then brake. Does it do the same thing as when you brake from high speed while in Drive??? A torque convertor not unlocking properly would act like like a manual tranny trying to stall out your engine/shaking before pushing in the clutch.

The "unlocking" is also supposed to be triggered by brake lights, and some say LED bulbs can keep this system from working properly.

Other info:

https://www.plowsite.com/threads/not...mission.56733/

Last edited by Abctx; 09-13-2018 at 10:09 PM.
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Old 09-13-2018, 09:48 PM   #25
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This problem is one I’m unfamiliar with but wonder if it could somehow be with the rear differential and driveshaft.
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Old 09-13-2018, 09:58 PM   #26
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Quote:
Originally Posted by Worksalot View Post
This problem is one Iím unfamiliar with but wonder if it could somehow be with the rear differential and driveshaft.
Good point here. I would also check the carrier bearing. Does not make much sense since it only happens when brakes are applied. Worth a look none the less. A bad carrier bearing will usually jump around or vibrate on deceleration.
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Old 09-13-2018, 10:34 PM   #27
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Quote:
Originally Posted by brushtrooper View Post
Good point here. I would also check the carrier bearing. Does not make much sense since it only happens when brakes are applied. Worth a look none the less. A bad carrier bearing will usually jump around or vibrate on deceleration.


Excellent advice! My sons 97 started shaking when he let off the throttle, he thought it was a tire balance issue and ignored it. Well, a short time later the carrier bearing failed and when the drive shaft went to flopping it took out the transmission housing which turned it into an expensive fix!
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Old 09-15-2018, 05:07 PM   #28
TSpradlin
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Only issue I get it when applying the brakes
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Old 09-15-2018, 06:11 PM   #29
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Loose nut behind the wheel ...

hmmm if it only does it when brakes are applied. at that time you have pressure going forward. Something that...when pressured is not holding up. But, sounds like you have dang near made a new truck with all the new parts.

good luck with & keep us posted.
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Old 09-15-2018, 07:03 PM   #30
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Just FYI. I installed rotors a while back from Autozone. One was waaaaay out of whack. Had to return it and get a new one. All good now.


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Old 09-15-2018, 07:19 PM   #31
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I would guess you got a bad rotor that isn't true. Did you replace your rotors with brand new ones or had your old ones turned at a shop?


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Old 09-15-2018, 08:37 PM   #32
TSpradlin
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I replaced my rotors with new drilled and slotted rotors from Summit Racing
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Old 09-15-2018, 08:49 PM   #33
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Maybe front steering stabilizer shock absorber.
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Old 09-15-2018, 08:55 PM   #34
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We are going to throw it up on a lift next weekend and go back over everything we can.
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Old 09-16-2018, 07:09 PM   #35
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Exactly what abctx said, before you brake throw the truck in neutral and see if it shakes then


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Old 09-16-2018, 07:18 PM   #36
Mike D
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If it only happens when you apply the brakes it only makes sense that you have warped rotors or I suppose thereís an outside chance you could have something modulating your brake cylinders but thatís not likely.

Weíre the rotors rated for your truck? There is a chance of a bad rotor, likely on the rear axle based on what you are describing.


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Old 09-16-2018, 07:58 PM   #37
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I have a similar issue had a caliber sticking... turned the rotors, new calibers both side and new pad... smooth as silk now.
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Old 09-24-2018, 08:15 PM   #38
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Well??? What was it???
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