Front end vibration when stopping at high speed

frankiev · 07-16-2015, 09:26 AM

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

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

07-16-2015, 09:26 AM	#1 (permalink)
frankiev Base Member Join Date: Apr 2015 Location: so fl Posts: 89 Drives: 2012 370 nismo Rep Power: 10	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

07-16-2015, 09:29 AM	#2 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 43 Posts: 36,449 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684440	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. SouthArk370Z, osbornsm, Hotrodz and 1 others like this. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

07-16-2015, 02:29 PM	#7 (permalink)
Silly Rabbit Track Member Join Date: Sep 2013 Location: Brookston, IN Age: 54 Posts: 683 Drives: '12 PW Touring Sport Rep Power: 618	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. __________________ NISMO R Tune Intakes \ Fast Intentions RHFC \ Borla CBE \ EcuTek Tuned\ SPL Camber Arms \ Powertrix Coilovers \ Swift Springs \ Avant Garde \ Wicked CAS \ Morimoto XB Halos \ Custom Fenders \ Hotchkis Sways \ NLP Splitter

07-29-2015, 06:17 PM	#9 (permalink)
zpower86 Premium Member Join Date: Jul 2011 Location: Huntsville, AL Posts: 189 Drives: 2011 Nissan 370Z Rep Power: 13	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 carlitos_370z likes this.

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07-16-2015, 09:59 AM	#3 (permalink)
frankiev Base Member Join Date: Apr 2015 Location: so fl Posts: 89 Drives: 2012 370 nismo Rep Power: 10	Theres 35000 mi's on the pads . Whats the procedure to re-bed the pads

07-16-2015, 12:57 PM	#6 (permalink)
frankiev Base Member Join Date: Apr 2015 Location: so fl Posts: 89 Drives: 2012 370 nismo Rep Power: 10	Appreciate the info ..Thanks

07-25-2015, 01:50 AM	#8 (permalink)
markesc Enthusiast Member Join Date: Apr 2014 Location: Utah Posts: 379 Drives: 2014 370z M.B. 7AT Rep Power: 3366	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...