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-   -   Front end vibration when stopping at high speed (http://www.the370z.com/brakes-suspension/105702-front-end-vibration-when-stopping-high-speed.html)

frankiev 07-16-2015 09:26 AM

Front end vibration when stopping at high speed
 
I dont usually drive on the highway but I noticed when light braking at around 80 theres a vibration in the front end .If I brake hard its not as bad but still there .In city driving I dont norice it at all . At first I thought it was warped brake rotors but I dont feel it in the steering wheel or brake pedal . Any ideas ?
Thanks

JARblue 07-16-2015 09:29 AM

Sounds like the beginnings of uneven pad deposits (also frequently and incorrectly referred to as warped rotors). What's the mileage on the pads? My first thought would be to re-bed the brake pads since it's free and easy.

frankiev 07-16-2015 09:59 AM

Theres 35000 mi's on the pads . Whats the procedure to re-bed the pads

FPenvy 07-16-2015 10:01 AM

i got 45k on mine and mine has had that high speed vibration for as long as i can remember. mine isn't bad at all though unless i'm dropping from like 120+

80mph slow down its just a slight vibration.

JARblue 07-16-2015 10:13 AM

Quote:

Originally Posted by frankiev (Post 3258485)
Theres 35000 mi's on the pads . Whats the procedure to re-bed the pads

Drive 60 mph, brake as hard as possible WITHOUT ENGAGING ABS down to 15-20 mph. Repeat 60 mph down to 10 mph. Repeat 60 mph down to 5 mph. Do enough runs to heat up the pads and rotors nice and hot. DO NOT COME TO A COMPLETE STOP WITH THE BRAKE PEDAL PRESSED during this procedure. Doing so will cause the hot pad material to deposit in one location on the rotor, which is the most common cause of so-called "warped rotors".

The key is to heat up the pad material enough so the uneven portion can be leveled off with hard braking. When new pads and rotors are installed, the purpose of this process is to distribute an even layer of new pad material onto the new rotors which allows the brakes to function properly.

If you're not comfortable doing this procedure yourself, a qualified shop can turn the rotors for you.

frankiev 07-16-2015 12:57 PM

Appreciate the info ..Thanks

Silly Rabbit 07-16-2015 02:29 PM

I have noticed the same thing. I really only notice it when driving aggressive on back roads. I noticed it constantly when I was making log files for my tune. Running WOT from 2500 to 7500 back down and repeating. If I brake medium to hard it isn't really noticeable, but light braking really shakes the steering wheel. Around town, even with mildly aggressive driving it isn't an issue. I've tried to rebed the pads, but didn't see any difference. I've thought about having the front rotors turned, but it just hasn't bothered me enough to take the time.

markesc 07-25-2015 01:50 AM

Mine just started doing this about 5k miles ago: My fault; aggressive braking before warming up the pads/rotors on the daily commute to my slave "career"

I'll have to give the braking sequence outlined above a shot...

zpower86 07-29-2015 06:17 PM

Here's Stoptech's guide to bedding brakes:
stoptech.com/technical-support/technical-white-papers/bed-in-theory-definitions-and-procedures/stock-brake-system-bed-in

Also info on other related topics:
stoptech.com/technical-support/technical-white-papers


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