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Old 03-16-2016, 07:04 AM   #1
Metallman56
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Car Shakes Under Braking

stop right there, I know what your thinking. warped rotor. I thought the same thing, replaced all 4 at once, and it still does it.

well it could be a out of balance wheel. yep that's what I thought too, got my wheels balanced last week, and it still does it.

so what else is there? here are some of the symptoms

the car only shakes under braking when the peddle is about 50% or more down. the car drives smooth just running down the road.

I don't really feel it in the brake peddle, but the whole freaking car shakes, so maybe I don't notice it so much in the peddle.

it does not do it when I pull the parking brake

I know I'm describing a warped rotor, but if there all brand new and it still does it what else could it be? when I replaced my rotors my pads looked fine, and if there was a high spot on one, would that cause the whole car to shake?

any suggestions would be helpful, thanks guys!
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Old 03-16-2016, 08:07 AM   #2
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The thing that gets me, is that you said you don't feel it through the braker pedal. That right there is not a warped rotor. Any issues with the brakes, you will feel through the pedal. Maybe it's your rack or your suspension.
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Old 03-16-2016, 03:44 PM   #3
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Worn ball joints, maybe?
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Old 03-16-2016, 07:18 PM   #4
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Control arms were replaced last spring, along with sway bar bushings, and tie rod ends.
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Old 03-16-2016, 07:50 PM   #5
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Strut mounts?
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Old 03-17-2016, 05:59 AM   #6
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Could be. I could use new struts its been about 4 years. Is there any chance i need an alignment?
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Old 03-17-2016, 06:18 AM   #7
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Alignment shouldnt cause shaking while braking.
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Old 03-17-2016, 09:15 PM   #8
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How are your front tires?
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Old 03-18-2016, 11:49 AM   #9
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loose hub bearing?
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Old 03-18-2016, 10:26 PM   #10
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if it starts as a vibration and ends more as a wobble (going from "fast" to 'slow' as you come to a stop) I would think Molson may have nailed it. get it up in the air and shake those tires to see if you've got any slop
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the resulting violent shake at highway speed may cause loss of control, white knuckles, loss of dental fillings, urinary incontinence and sudden religious conversion.
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Old 03-21-2016, 10:58 AM   #11
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That is exactly what it feels like. I have not changed hub bearings in like 10 years.
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Old 03-21-2016, 04:25 PM   #12
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That could be it then
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Old 03-22-2016, 08:53 AM   #13
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So tonight when i get my car up in the air what do i do? Just see i there is any play in the tires by trying to shake the crap out of it?
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Old 03-22-2016, 10:53 AM   #14
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Put your hands at 12 and 6 o clock. Try and wobble the wheel. If there is play. You have a worn out bearing. If you do 9 and 3 that will tell you a tie rod is bad.
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Old 03-22-2016, 03:22 PM   #15
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Really? Well thats a cool trick, thanks!
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Old 03-22-2016, 03:50 PM   #16
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Yup. I work at an auto shop, everyone checks it that way. Lol


Wheel bearings either make a groaning sound while driving, or have play. Or sometimes both symptoms. But its usually one or the other.
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Old 03-22-2016, 07:04 PM   #17
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I just put the front tires up in the air. Right side moving left to right seemes solid.went to test up and down and thought it probably a bad idea to put my fingers under here with just a jack holding it up. So i grabbed the tire up too amd the rim and the bottom. Its solid too. So is the other side. So i put stands under it so i coukd really put some torque on it and, no change everything up front is solid. Sooo now what? Wheel bearing assemblys are over 100 each, are we sure its the problem?
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Old 03-22-2016, 07:59 PM   #18
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actually up and down is the ball joints.... a worn bearing SHOULD shake in any direction, but is easiest to figure by turning all the way left, then right, and listening for a change.

you did check the CV joints, right? the only other thing I could think of is an ABS error that is engaging just one caliper. As for a test for that, OH PLASTIC INDIAN WHERE ARE YOU???
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Old 03-22-2016, 08:58 PM   #19
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No, ball joints are 7 and 2 o clock for the driver wheel, and 4 and 10 ish for the pass wheel. Ball joints you are shaking the wheel at a vertical angle.

So...

Ball joints - vertical shake
Wheel bearing - top to bottom
Tie rods - left to right

Truck ball joint tests are different then you would test on a car.

Depending on how bad of play a wheel bearing is, it will have play in all directions. And then can be hard to test tie rods because the left to right play for the tie rods you can actually still be feeling the wheel bearing...



When you do that test metal, you are feeling for a "knock" if there is a problem you will feel play... You arent trying to turn the wheel with the rack/pinion etc. you are just trying to get a small component to show weakness. If that makes sense.
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Old 03-23-2016, 06:35 AM   #20
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hmmmm

all I did was get the front of the car up in the air and try to shake or jerk the tire. first at 12 and 6 than at 3 and 9. I did not get any "play" either way. everything seemed solid. with that being said remember that I've never done this before and what might feel solid to me, might not feel the same way to someone who's done this before. but I can say if there is any slop, for lack of a better word, its very minimal.

are cv joints the same thing as ball joints? if so I got new ball joints less than a year ago when I replaced my control arms. but either way I guess I'd like to test them too, because the absolute last thing I want to do here is just throw money at parts and hope one of them fix it.

last thing I'm pretty sure its getting worse, I mean the shaking. last night I had to get on my brakes pretty good and everything was shaking like crazy including the steering wheel.
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