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Re: Front Brake question

To: MG List <>
Subject: Re: Front Brake question
From: Max Heim <>
Date: Wed, 04 Jun 2003 09:25:02 -0700
That is just about the stupidest spec I've ever read. After it has been
ground once, how would you know what the original thickness was? Why don't
they just spec it as a minimum total thickness, rather than a maximum cut
off an indeterminate original thickness? Written by lawyers, apparently, or
a particularly bloody-minded engineer -- not by a mechanic, that's for sure.

[end of rant]

What it boils down to, of course, is a minimum thickness of .30... but why
didn't they just come out and say that in the first place? (oops, slipped
back into rant mode)

on 6/4/03 9:11 AM, Telewest (PH) at wrote:

> "Run-out must not exceed .003 in.  If it is found necessary to regrind the
> disc faces they can be ground up to a maximum of only .040 in off the
> original thickness of .350 to .340 in.  This may be ground off equally both
> sides, or one more than the other, provided that the total does not exceed
> .040 in.  The reground surface must not exceed 63 micro-in.  After grinding
> the faces must run true to within a total clock reading of .002 in and the
> thickness must be parallel to within .001 clock reading."
> Leyland Workshop Manual.
> ----- Original Message -----
> From: "Dodd, Kelvin" <>
> To: "'Bob Howard'" <>; <james.feyrer@Dartmouth.EDU>
> Cc: <>
> Sent: Wednesday, June 04, 2003 4:36 PM
> Subject: RE: Front Brake question
>>> Jim,
>>>   In the workshop manual somewhere is minimum thickness
>>> allowed for the
>>> rotors.
>> I have been looking for this spec. and have not found it in any workshop
>> manuals.  If anyone has, please let me know.  New rotors supplied by
> Brembo
>> are imprinted with   "Min thickness 7.6mm or .30 inchs" so I would think
>> that is a good spec. to go with.


Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires

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