Re: alfa-digest V9 #420 - sliding callipers anyone?

[AlfaNeely@xxxxxxx]

In a message dated 4/15/2003 6:23:16 PM Central Daylight Time, 
owner-alfa-digest@domain.elided writes:

> Date: Tue, 15 Apr 2003 17:48:03 -0500
> From: "Joseph Kanellopoulos" <kanellj@domain.elided>
> Subject: Re: sliding callipers anyone?
> 
> Hi,
> 
> my understanding is that technically there are both sliding and floating
> caliper designs which vary somewhat but I was intending to combine them 
> both
> by calling them sliding.
> 
> Besides uneven pad wear does it tend to also cause "warping" or "wobbling"
> on the rotors?
> 
> It would seem to me that if a rotor was turned and it was not done so
> perfectly (which if one sees how the disc turning machines are.... i.e. not
> a "real" lathe was used or the rotor was not mounted correctly" then the
> sliding/floating system would exasperate the problem and maybe even
> accelarate wear of the disc, since every system with mass has inertia and
> hence delay, so there might be a tendency to lag the warpness of the
> rotor....
> 
> Joseph
> 

       I just skipped about a week's worth of Alfa Digest so perhaps I missed 
something.  I am not sure I understand your question.
       First you cannot accurately and quickly turn a rotor on a true lathe.  
It can be done, but much cooling time between cuts is required.  With two cu
tting tools, the heat is even on both surfaces.
       I always request that who ever cuts the rotors cut as little as 
possible and cut them twice if required.  I have seen some shops that just 
crank the cutters together and try cut too much in one pass.

       Rotors warp due to heat.  Rotors will stay straight longer if you 
drive slowly and allow them to always cool after hard use.  The brake pads 
against a hot rotor will cause uneven cooling.  If your emergency brake 
pushes the pads against the rotor like it does on the transaxle Alfas, then 
putting on the E brake after using the brakes hard is the worse thing you can 
do.

Ciao,
Russ Neely
Oklahoma City
--
to be removed from alfa, see /bin/digest-subs.cgi
or email "unsubscribe alfa" to majordomo@domain.elided