[Roadsters] Rotors

[Pete Peters]

>From the 311s.org TechWiki:

"New rotors are approximately .433" thick with a minimum thickness of .325",
so .39 is in the middle.

Did a quick search (Google is your friend), and found:

"As a rule, the depth of a finish cut should be .002 to .008 inch. If the
rotor is in bad shape, multiple cuts should be used: one or more rough cuts
followed by a shallow final cut." So, you'd still have .38 even if .01 inch
was removed.

Do they need to be turned? I've seen quite a few "turn 'em/don't don't em"
comments. More searching found:

"In TSB No. 00-05-22-002, GM states: "Brake rotors should only be turned
when one of the following rotor surface conditions exist: severe scoring
with depth in excess of 1.5mm or 0.060 inch, pulsation from excessive
lateral nmout of more than 0.080mm or 0.003 inch, thickness variation in
excess of 0.025mm or 0.001 inch or excessive corrosion on rotor braking
surfaces. Rotors are not to be resurfaced in an attempt to correct the
following conditions: noise/squeal, cosmetic corrosion, routine pad
replacement or discoloration/hard spots."

GM says resurfacing is "ineffective at correcting brake squeal and/or
premature lining wear and should not he used to address these
conditions-unless specifically directed to do so in a service bulletin."

Love this comment;

"I personally don't bother with machining rotors...waste of time when new
rotors only cost $20... "

Obviously, that guy doesn't own a roadster. <g>

Pete "mine were below .32, so easy decision -- bought new ones."

-----Original Message-----
From: datsun-roadsters-bounces at autox.team.net
[mailto:datsun-roadsters-bounces at autox.team.net] On Behalf Of Tim
Sent: Saturday, April 04, 2009 10:55 AM
To: datsun-roadsters: autox.team.net
Subject: [Roadsters] Rotors

I have read that the minimum thickness is .331 in. The two rotors I am
working with are .39 in thick. I do not know how much material is removed
when a rotor is turned. Is there enough material left to have these turned?
Or do I need to get different rotors?

TIA

Tim
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