[s-cars] Re: Slotted Rotors

Todd Phenneger tquattroguy at yahoo.com
Wed Oct 4 14:12:52 EDT 2000

 For me the main advantage isn't when I'm driving hard  (although I do like having the gasses vented as it does seem to help fade from pad gassing.

   But for me the advantage is when the car is not being driven hard and the brakes are stone cold and wet.  The rotor is still scraped dry by the pads and vice versa so when you hit the brakes, instant stopage, no car wash syndrome.  (hit brakes and keep going)

   So in answer to Rods question,  yes, the primary purpose is to outgass the gas vapors so they dont build up between rotor and pad.  But  a side benefit is that slotted rotors clean the pad.  Of dirt, grime, and Water.  YOu mentioned yourself about the flat wear surface.  Thats because it keeps the pad and rotor surfaces scraped clean.   This works for water as well.   Look at all the Rally cars.   There is a reason they run slotted and not drilled.  In mud and water it does help.  On the other hand, I've heard of at least one instance where a piece of pea gravel go stuck in a hole on a drilled rotor and destroyed the brakes.  OUCH.    Never heard of that with slotted though.  Yet.   

  Just sharing.  



  larry leung <l.leung at juno.com> wrote: 
Agreed, slotting or cross drilling is to relieve pad outgassing. However, the water issues seemed interesting, to say the least. And the slots/holes will also aid in water removal, no matter how little of it would be there on a hard driving car.


------Original Message------
From: Frank Amoroso 
To: s4audinut at aol.com, l.leung at juno.com, shields at msrl.com, igor at s-cars.org
Sent: October 3, 2000 10:50:14 AM GMT
Subject: Re: [s-cars] Re: Slotted Rotors

Yep, to prevent pad outgassing from interfering with pad to rotor contact. An
added benefit on cross drilled rotors in which the drilling does not vent to
atmospere the slots allow for the gasses to, yet again, escape and help avoid a
pulsating sensation that can be felt through the pedal.

--- s4audinut at aol.com wrote:
> Please correct me if I am mistaken, but slots are on rotors to vent hot 
> gasses and promote a flat wear/friction surface; not provide a runoff gutter 
> for liquids. 
> Rod
> To unsubscribe, email: s-car-list-unsubscribe at egroups.com

Do You Yahoo!?
Yahoo! Photos - 35mm Quality Prints, Now Get 15 Free!

Todd Phenneger
    83' ur-q (awaiting a 20vt)
    84' 4ktq  fun but I'm sick of CIS.

Do You Yahoo!?
Yahoo! Photos - 35mm Quality Prints, Now Get 15 Free!
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.audifans.com/pipermail/quattro/attachments/20001004/0caa81da/attachment.htm

More information about the quattro mailing list