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In article <Y7MOf.44920$H71.10895@newssvr13.news.prodigy.com>,
Stuart A. Bronstein <spamtrap@lexregia.com> wrote:[color=blue]
> Then it says to pry out the four "cylinder boot set rings and boots" per
> caliper, which at first I presumed was the same as the "piston seals"
> you speak of. But, reading on, Toyota says to blow out the pistons with
> compressed air (placing a wood plate in the space where the rotor was).[/color]

I did my SD1 Rover front calipers recently and these have 4 pistons each.
After removing from the car, use a bleed nipple(s) from the other side to
seal the pipe(s) inlet. Get a rubber tyre valve - the type used in
tubeless tyre wheels, remove the valve core, and fit it to a tyre
compressor or foot pump. Secure all the pistons using G Clamps - etc. Push
the tyre valve onto a bleed nipple which is open and apply air pressure
and release a G Clamp gradually till one pops out. Be careful as fluid
will go everywhere and there is considerable force around. Once you've
discovered how far they have to go to come out you can adjust the other G
Clamps to stop them only just in time. You then put the one that's come
out back in just enough to make a seal.

Examine the pistons and bores for damage or corrosion after a thorough
clean. Damaged piston replacements can usually be bought separately.
[color=blue]
> Only then, the repair manual says to pry up the four "piston seals" with
> a quarter inch flathead scewdriver. The Toyota Repair Manual exploded
> diagram shows four "set rings", "boots", "pistons", and "piston seals",
> in that order, outward from the rotor in both directions.[/color]
[color=blue]
> The problem then becomes, how does one test piston force after removing
> the piston seal when the pistons are already out of the calipers by
> this time.[/color]
[color=blue]
> Still, there's no harm in taking the calipers apart. The shop manual
> says to lubricate some areas with "lithium soap base glycol grease" and
> others with "disc brake grease". Aren't they the same thing?[/color]

What you want is red rubber grease. Most decent accessory shops should
have it.
[color=blue]
> So many questions ... so much to learn![/color]

--
*I love cats...they taste just like chicken.

Dave Plowman [email]dave@davenoise.co.uk[/email] London SW
To e-mail, change noise into sound.