In a message dated 15/06/2007 10:05:33 AM Pacific Daylight Time,
doddk@mossmotors.com writes:
If there is sufficient material left on the brake rotor, the faces can
be cleaned and de-grooved by a machine shop.
MGB brake rotors don't have a lot of meat on them, so it may be
necessary to install new rotors and pads. It may be cheaper too, as the
price of new rotors is pretty low.
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Just to add to what Kelvin said, new rotors are cheap like Borscht -
replacing them on an MGB isn't painful at all. You only have as I recall,
about
.040" to play with at most.
You do NOT need to clean off all the scoring from dust and grit. Although it
makes a nice looking rotor, it doesn't affect braking much at all. Better to
leave a few divots than to cut the rotor down enough to clean even the
deepest marks. The reason is twofold. First, the scoring doesn't cause a
problem
with the pads - they wear into the score pattern very quickly and you'll never
know they are there. Second, if you cut the rotor down too much, you have
the pistons coming out even further, they can corrode on the newly exposed
surfaces and you'll probably be looking at new pistons next time you put new
pads
in and push those now rough pistons back into the bore (they typically don't
seal very well thereafter).
One caveat - I used to work on a shop that did brakes and we quickly learned
to take a few thou skim on brand new rotors to true them up as they were
notoriously slightly out of true and if we didn't do this, we'd get come backs
with brake pedal pulsing etc. Kelvin can probably tell us if that is still
true (no pun intended), although even if it were, he might not hear about it
as
the shops would just true them up rather than bitching about it.
Bill Spohn
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