Brake vibration, '95 355 | FerrariChat
Buy

Brake vibration, '95 355

Discussion in '348/355' started by sdavies88, Jul 13, 2013.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. sdavies88

    sdavies88 Karting

    Jun 9, 2009
    156
    Halifax, NS, Canada
    Full Name:
    Steve Davies
    #1 sdavies88, Jul 13, 2013
    I'm experiencing vibration under braking (noticed in brake pedal). More noticeable at high speeds. I had a similar problem and replaced the front Rotors. The problem diminished significantly. I was recently at the track and after several sessions noticed more vibration similar to before. I suspect the rear rotors may not have appropriate runout (warping). The pads are only a few months old. Does this make sense or could be another cause?
     
  2. Mitch Alsup

    Mitch Alsup F1 Veteran

    Nov 4, 2003
    9,727
    #2 Mitch Alsup, Jul 13, 2013
    The question turns out to be either warping or insufficient thickness.

    I had a set of rotors turned that were just over the minimum thickness lmit. After the next track event the brakes started to feel not like the rythmic warp, but like sand paper scratching a soft metal surface. Back at the shop, we laied a strait edge over the rotor surfaces and saw that there were hundreds of little dimples the high points corresponding to the pins inside the rotors. In effect what happened was not that the rotors warped, but that the surfaces got hot enough to become soft and the pressure of the pads pushing on these surfaces cause the unsupported area to buckle under the load.

    A fresh set of rotors and I was back in the game.
     
  3. plugzit

    plugzit F1 Veteran
    Silver Subscribed

    Dec 1, 2004
    7,776
    Redondo Beach, CA
    Full Name:
    Bruce Bogart
    #3 plugzit, Jul 13, 2013
    Either that or....
    You're just feeling the ABS kicking in under hard braking.
     
  4. sdavies88

    sdavies88 Karting

    Jun 9, 2009
    156
    Halifax, NS, Canada
    Full Name:
    Steve Davies
    #4 sdavies88, Jul 13, 2013
    Pretty sure it's not ABS related. Symptoms are experienced with little brake effort. Sounds like I should attempt turning them (if thickness will allow) or replace rear rotors.
     
  5. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,566
    San Carlos, CA
    Full Name:
    Mitchell Le
    #5 yelcab, Jul 13, 2013
    If you feel the vibration in the steering wheel, then it is the front.
    If you feel the vibration in your seat through your butt, then it is the rear.
    Can't tell what the vibration in the pedal ... is other than brakes.
     
  6. sdavies88

    sdavies88 Karting

    Jun 9, 2009
    156
    Halifax, NS, Canada
    Full Name:
    Steve Davies
    #6 sdavies88, Jul 13, 2013
    The front rotors are 2 month old Girodiscs so pretty sure not front.
     

Share This Page