Car stutters braking at high speeds
 

So yea if in going like above 70 and brake normally my wheel stutters. Is this normal? Is it a warped rotor, alignment? Any ideas?

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Okay you have a couple choices.

1. Warped Rotors = Only an issue if you race your car
2. Pad deposits = Totally possible
3. Alignment = Only an issue if it happens ALL the time. Not just under braking.

Not trying to bump in, but what causes pad deposits?

Oh, hey, hi there! http://www.the370z.com/brakes-suspen...-deposits.html

That was my follow up question lol

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Most likely you were doing some very hard braking, stopped the car put your parking brake up or had your foot on the brake pedal for a long time while at a light or something.
This is enough to cause your pads to melt, which creates excessive "pad deposits" on your rotors. The absolute sure fire fix is to change your pads and resurface your rotors, doing some hard braking or a brake pad bedding procedure may or may not help.

It's highly unlikely you actually warped the rotor.

Either rotors need to be resurfaced or wheels need to be balanced.

your front rotors are warped if the steering wheels shakes if you feel it in your butt and feet your rears may also be warped. it does take much to warp the stock rotors

Wait so my steering wheel shakes. so my front rotors are warped!?
Why though? I dont see a reason for it to be warped. its been cold as balls.

Very untrue. You realize the stock rotors are cast iron right. It takes a crap load of heat to warp them.
What most people feel in rotor shake are deposits, not warpage.
"Warped" rotor replacement is the most over-sold fix that shops do.

It's pad deposits from holding the brake at red lights most likely.

Parking brake has nothing to do with it. Parking brake is a separate drum brake. But it most likely is pad deposits on the front rotors.

I stand corrected i guess lol my rotors have 30k miles on them. 10k from me, 20k from previous owner. I can feel it shaking even all the way down to 0mph and it shakes bad at high speeds. you think its just pad deposits? whenever i warped the rotors on my wrx tracking they did the same thing thats why i figured this was the same. and the butt/feet vs pedal and steering wheel is not untrue

i would personally get a scotch bright bad and rubbing alcohol or a rotor hone and clean your rotors to see if that fixes it. also, you can still warp your rotors when its cold. i think i warped mine from braking hard at 120 because I thought a broken down charger was an unmarked police car. i know you're never supposed to brake heavily at those speeds but it was just my reaction. ever since then my rotors shake a little and its been months. although they are 14 inch iron cast rotors i still feel that there is a chanced that i warped them after some mess ups lol

Hmm I do occasionally break from 140 but it's not abrubt by any means

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here man, read this article. we both might have pad deposits lol There's no such thing as 'warped' brake rotors - Orlando Autos | Examiner.com

Sigh now to figure out the cheapest way to fix it

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Yes, cheap is the most important consideration when dealing with brakes.

You can say that again

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God, I hope you're being sarcastic. Otherwise you're setting yourself up for a big problem.

:iagree:

Please don't skimp on brake components. Your brake problems can easily become someone else's problem if something were to happen.

If it's just pad deposits don't I just need to get them out

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I'm not quite sure what you are saying here.

If it's just pad deposits, you should be able to get the rotors turned (resurfaced). Fairly inexpensive :tup:

Yep. Take off the rotors, take them to the auto parts store and have them turned. Take them home, put them back on and go bed the brakes in again. And stop holding down the brake pedal at red lights.

1. While you don't have to race to warp a rotor, it is rare for a DD.
2. 99.9% chance that this is the problem. A few 60-5 hard braking sessions may fix it. If that doesn't work, resurfacing the rotors may be the answer. As others have said, don't come to a complete stop after braking hard. If you do have to stop after hard braking, keep your foot off the brake - shift to neutral and/or use the parking brake if necessary.
3. Yep. If it only happens when braking, it not a balance problem.

Oh wow I didn't know about number two. And it only happens when breaking from high speeds that's it. So yea hopefully it's nothing too serious

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Won't using the handbrake when brakes get toasty result in shoe deposits on the rear parking brake drums and potential handbrake sticking?

I'm sure it's possible, but I've never heard of that happening.

The parking brake is a separate system - a drum brake on the back of the rear rotor assembly. I guess it's possible to get the whole assembly hot enough to affect the parking brake, but not likely with a DD.

If you are using the parking brake to slow down, you could get deposits. ;)

Ok so i talked to a friend of mine who works at a shop and he told me that my suspension might be the problem? He said that although rotors can cause this it might be more of a suspension problem then it is anything else, and he advised that i dont get a alignment just yet seeing how if that isnt the problem im going to need to get another one after i do fix the problem. Could a bent arm or something bent or dented be the cause of the wheel stutter at braking at high speeds? Also my steering wheel is a bit off center to the left. so if its 50/50 which is straight, mine is at 45/55.

Have you tried burning off any glaze that may be present? Takes about five minutes and may solve your problem. Try it before worrying about the suspension.

I got that shuddering when my car is merely 1 year/10K. Ignored it at first and a few months later it became pretty bad. I tried the hard braking and put in a new set of Hawk to no avail. Reluctantly took it back to the dealer to "machined front brake rotors" and the shuddering went away. Just my two cents.