azn2dmax

iTrader: (33)

So i get these semi violent vibrations when braking between 40-45 MPH especially downhill. Once I get lower than 40MPH then it goes away.

I inspected my rotors and they are not warped, the car does not veer to one side when braking, and I have never tracked my car. I also checked att ball joints and end joints, all are "good". No side to side play.

I did get new tires (Nitto NT555) put on. Could it be the balancing? If it was it would do it all the time then right?

I have UMI Performance MM but that couldn't be the problem could it? Never did this when I first installed.

I did a couple of hard brakes to see if it was just pad buildup and it helped a very little bit.

It's kinda annoying and scares me when the whole front of my car feels like its going to vibrate/shake off.

Any help would be appreciated

Onefast V

iTrader: (3)

how did you inspect the rotors?

01350ss

iTrader: (18)

Just machine the rotors

azn2dmax

iTrader: (33)

Can you maci=hine cross-drilled/slotted rotors? Like I said Ive never tracked the care so no excessive heat. Can it warp without those factors. It's my daily driver.

azn2dmax

iTrader: (33)

Visual and Ghetto lateral run-out. Don't have the measuring tool but rigged up something and it was even all around.

kl2onik

iTrader: (3)

Ive machined my girls on a g35 and it works great...Make sure there is enough to take off though( should be no prob if it's the first time its getting machined). Also the balancing could very much be it also mine only caused vibration between 40-55 but it was always there not just braking. When I took it to get balanced the shop said that whatever idiot balanced them before ended up putting a dumbell worth of weight clips on the one rim. Even though that particular rim was balanced it was different than the others.

hatched91

It can be poorly balanced wheels. Certian speeds can create a resonance which causes more vibration. I would try and check your rotors more accurately. I had about a 1/4" hop (ovalized) in my rear wheel, and it was nearly shaking my car apart at 70mph... so these cars are definitely sensitive to imbalances, more so than some other cars.

Honestly, it sounds like mildly warped rotors to me..... But then again, once I had my wheels rebalanced, i noticed it smoother in the 40-50mph range.

azn2dmax

iTrader: (33)

Working with Brakemotive right now to get warranty on the rotors I purchased from them. Should I get new pads if they send me new rotors?

wcryan

iTrader: (2)

check your balance. I have to balance my wheels about every 3-4000 miles.

thebigjmsho

Good luck lol can hear them laughing now.. try a dial indacater ****

RADEoN

iTrader: (12)

Shut the **** up troll. Seriously. If I were you, I would have killed myself like 10 years ago.

hatched91

OP, i thought i had the same problem with my car, and put a dial indicator on them. they didn't have anymore than 0.005" warping in them... which is probably what came out of the factory.

If you buy new rotors, definitely get new pads. Your old pads have a chance to wear your new rotors funky, depending upon how dense/tough your brake pads are.

As i said before, i would check your wheel balance first, mine were off horribly. I agree with WCRYAN, these wheels do not like to hold balance very long/well.

tigerlion

Even though you did not track, rotor can warp if you go through a water puddle with your rotor heated/

kl2onik

iTrader: (3)

I got some hawks sitting around if you are interested...

PS And honestly Jmsho when the *** are you finally gonna say something worth saying

azn2dmax

iTrader: (33)

Good point!! it had been raining a lot lately. maybe the cause.

azn2dmax

iTrader: (33)

Thanks!! but Brakemotive is one of the best vendors on here!!!! We have an agreement set up. thanks for the offer though.

echo1189

I am having the same problems with brake vibration with my 2008 Escalade. Just downhill and at 40-50 mph. Also, the grade of the hill needs to be pretty steep as well. Whole car shakes pretty much.

I had the dealer machine the rotors and check out the entire braking system.....and it only helped for about a month. Right back to shaking again. I took the car back and they told me that everything was in spec....and to wait until the rotors wear out so that I can replace them.

Did you ever get to the bottom of what it was? I am thinking about just changing the rotors and getting the tires balanced.

azn2dmax

iTrader: (33)

I changed rotors, pads, wheel hub bearing and still have the vibrations. Sick and tired of it. I havent balanced the tires yet b/c I dont think it has anything to do with balancing. Only happens when I brake. HELP!!!

Could my calipers be bad?

liqidvenom

iTrader: (2)

do you have any air in your abs pump system? maybe its the abs coming on and off which might be causing the vibrations..

do you get then when you do a slow gentle brake stop?

BudRacing

iTrader: (3)

Honestly, the tire balance would have been the 1st thing I did. If you got your tires at discount tire they'll do it at no charge.