Hello, John Talley here with partzilla.com.
Today I'm going to walk you through the process to change out the seals on a
brake caliper. It's pretty much the same procedure
regardless of what type of brake caliper it is or what machine it came off of.
Now what you are going to see that's different from caliper to caliper is that
it may have either one, two, or even three pistons that you're
having to deal with. Of course, more pistons makes them a
little bit more challenging to deal with. The one that we're working on today only
has two, so it shouldn't be that big of a problem to get it done.
Let me go put on some gloves and we'll dive into this real quick.
Now the name of the game here is to keep things as clean as you possibly can.
So what i'm going to do is use a little bit of our contact cleaner
to get all this residual dirt and grunk that I can see that's on the caliper,
because the last thing I want to happen is for that to work its way in after I
pull those pistons out. So let me head this over to the wash
down table, get that cleaned up, and then I'll show you how to get those
pistons popped out of there.
So we've got it cleaned up reasonably well, and what we're going to do now
is either place a rag or a piece of cardboard
in front of the pistons, and then we're going to apply air pressure
to the inlet. Now keep in mind this is not going to take a lot of pressure
and when they come out of there, they're going to come out of there with a lot of
authority and you do not want to have your fingers
in here when you do it. Otherwise, it's it's going to leave a mark and I don't
think you want that to happen. We've got a cardboard in place, and we're
going to apply a little bit of pressure right here.
Remember this is not going to take a lot, so just barely pull the trigger.
All right, we got one. Let's put that back in there see if we can get the
other one to release. This is the trick when you're working
with multi-piston calipers: one side usually plops out and the other side's
still hung up in there. Now what the cardboard accomplishes--
other than keeping it from flying across the room--
it holds it in just far enough to where we can hopefully get the other one to
release and push out to that same level.
There it goes.
A little bit of air pressure makes all the difference.
Now we can work 'em the rest of the way out.
And as I said, the name of the game is to keep things as
clean as clean as possible. And I can see now why this other one was
a little bit hesitant on coming out. There's actually a fair
amount of gunk, dirt, whatever that's been built
up inside. Because what you're going to find is
there are actually two seals. You've got an outer dust seal
and then an inner compression seal. It's just a little bit further in,
right here. Now more than likely, the dust seal failed on that one that didn't want
to quite work its way out, because it had some foreign material
that crammed in there. This is a really close tolerance,
and it doesn't take much to jam it up. So these
should work a whole lot better when we go to put it back on the machine.
So let's get our old seals out. Like so.
we're going to use some brake cleaner to clean up the pistons while they're out.
Fair amount of trash on there. Now we're going to take some brake fluid,
put it on a rag, and then clean out the inside of the
caliper itself.
These are actually in pretty good shape, so it's not going to take me long to do
this. Just do take the time to clean up the
caliper before you pull it apart, because this is where you would cram a
bunch of dirt in there if you did not clean it up properly.
Now with that done, it's just a matter of getting the seals back in.
Be careful when you're doing this. Take your time.
Do not rip or puncture either that inner sealing seal, or o-ring,
or the dust seal out here. if you do, then your caliper is going to leak again
and or get dirt into it.
There we go. Now we'll take a little bit of brake fluid,
put it around the seal,
then on the piston itself,
and just pop it back in. And she's in. All right guys, one down, the
other side to go. It is installed exactly the same way.
After that, all I have to do is remount it to the machine,
fill it up with some brake fluid, get it bled, and then she's ready for the track.
Well listen, no matter what machine you have,
if you need tools, or parts, or chemicals, come see us at Partzilla and we can get
you taken care of. If you have any questions or comments
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