[Mgs] Rebuilding a brake caliper

[David Ambrose]

joseph cianciotti wrote:

>Okay, so I have to rebuild it or have it rebuilt. How complicated a  
>job is it to do yourself? Is there a place where I can get step-by- 
>step directions? And what about parts? Other than changing the pads,  
>I've never done anything like this. Thanks for pointing me in the  
>right direction.
>  
>
I've done these rebuilds several times. They can be tricky, but I don't 
think it's beyond the reach of a good home mechanic.

Remove one piston at a time with air pressure. A C-clamp will hold the 
opposing piston in place. There are two seals and a dust cover. The 
inner seal comes right out with a sharp, pointy tool. The outer seal can 
be pried out with a largish screw driver. Wedge it under the metal part 
and turn; working around the cylinder. You have to bring the seal out 
evenly. If you get it cocked, it will be a royal bear to remove (use the 
method below to reseat it and start over).

Installing it without damage is the hard part. Gently clean the sealing 
surface with a brass wire brush. Corrosion will make it difficult to 
install the seals. You need to get the new outer seal started, then seat 
it square into the cylinder. I made sure the seal was started and 
square, then used a C-clamp and a piece of hardwood to press it into 
place. I see Moss has a $30 tool specifically for this job. I haven't 
tried one, but it sounds great if it works well.

You might want to order an extra seal set.

Cheers,
Dave Ambrose