Re: [ST] st Digest, Vol 9, Issue 41

["Chris Harwood" <Chris@xxxxxxxxxxxxxxxxxx>]

I've not done vehicle workshop training so I rely on my engineering
training, experience and manuals.

There are times when taking something apart more than necessary will
cause a lot of aggro.  You learn a lot but it may cost more and mean
you're not back on the road as soon as planned!

Lubrication is not always good.  The wrong lube in certain situations
can cause more resistance than no lube at all.  Secondly, some parts
work best dry.  Don't forget that lubricants usually capture dirt
particles and I think your brake pistons are best lubricated with the
small amount of fluid that gets past the seals.

I don't touch brake seals or disturb them (i.e. remove the pistons
beyond the first seal to appear) unless there are signs of excess fluid
leak or wear on the pistons.

Having said that, most of the 'useful' knowledge I have is from pulling
things apart for the heck of it!

Copper grease is used over here to prevent seizing bolts primarily.  So
the caliper bolts and a bit on the back of the pads.  More cynically,
it's used to make it look as if you've had a service done because it's a
bright colour!

Enjoy yourself.

Chris Harwood
00 RS

>>> sprint_st@xxxxxxxxxxx 31/12/2005 10:53:33 >>>
Brett,
In the past I didn't totally remove the pistons but just blasted it
with
brake cleaner with the piston pushed out a bit.  That seemed to do ok
but
maybe just ok. I'm planning to do a more complete clean very soon. 
"more
complete" being taking the calipers off, putting them on a bench and
taking
the pistons out.  I do know that some guys replace the seals but I'm
not
sure that is "necessary" yet but there is probably a good argument to
"you've got it apart, why not do it?"
I've heard of guys putting a light coat of grease on the pistons but
I'm not
sure what type of grease and I'm sure you know about the reluctance to
put
grease anywhere near the pads.  I think there is a grease known as
copper
clad in Europe that is used for this purpose and maybe it is just the
caliper grease you put on the pins the pads slide on, but I'm not
sure.
Rod
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