topgunjames
Member
Disclaimer: I'm not a brake specialist, the method below is simply the procedure i used that worked for me. I'm not responsible if you follow this method and have brake issues.
Successfully rebuilt my evo 3 calipers,the rebuild process is slightly different to trondabrons magna single pot in the fact that theres 2 pistons not one and a retaining ring is used to hold the dust boot in its place.
Anyways this basically summarises the process with pictures
First off you have to remove ONE piston, i.e. you rebuild one piston bore at a time, making sure the other piston hasnt been pushed out of its bore compeltely
Remove the piston, its old dust boot, retaining ring and inner seal and give it a good clean with some brake cleaner, also remove any excess grit in the dust boot groove with a flathead screwdriver lightly, making sure you dont scratch the inner bore, same time lightly polish the piston making sure its nice and smooth.
NOTE: take notice of the orientation that the old dust boot came off, as you must put the new dust boot in the same way (the dust boot varies on each side if you look closely)
Lubricate the new inner seal with brake fluid and install it in its position, also lubricate the entire bore with some fresh brake fluid
So far as you can see the rebuild process is the same (besides the fact that there's 2 pistons) as the single piston calipers, heres where the rebuild process differs.
Lubricate your new dust boot with brake fluid, then place it over the piston (just the front part of the piston not all the way as you can see in the pic).
Next gently push the piston (making sure the bore and the piston is well lubricated) into the bore, make sure you do it straight and dont force it, it should go in no problem if you push it in nice and level.
Using your fingers tuck in the dust boot surrounds so that they are just flush with the outer rim of the bore
Now insert the retaining ring inside the bore making sure it does not go under the dust boot but rather over it, push it all the way back till it snaps into place in its groove
Below shows the retaining ring just on the outskirts of the bore (you just have to push the retaining ring further in till it snaps into the groove)
Thats it, repeat the process with the second piston, then test the caliper for actuation and that the dust boots remain in place
note: dont push the pistons completely out, just enough to test that the pistons are properly covered by the boot, and that the retaining rings are hold the dust boots in place)
The picture below shows me testing the caliper (i had a sanding block placed horizonatally to stop the two pistons coming out completely but removed it for photo sake)
Successfully rebuilt my evo 3 calipers,the rebuild process is slightly different to trondabrons magna single pot in the fact that theres 2 pistons not one and a retaining ring is used to hold the dust boot in its place.
Anyways this basically summarises the process with pictures
First off you have to remove ONE piston, i.e. you rebuild one piston bore at a time, making sure the other piston hasnt been pushed out of its bore compeltely
Remove the piston, its old dust boot, retaining ring and inner seal and give it a good clean with some brake cleaner, also remove any excess grit in the dust boot groove with a flathead screwdriver lightly, making sure you dont scratch the inner bore, same time lightly polish the piston making sure its nice and smooth.
NOTE: take notice of the orientation that the old dust boot came off, as you must put the new dust boot in the same way (the dust boot varies on each side if you look closely)
Lubricate the new inner seal with brake fluid and install it in its position, also lubricate the entire bore with some fresh brake fluid
So far as you can see the rebuild process is the same (besides the fact that there's 2 pistons) as the single piston calipers, heres where the rebuild process differs.
Lubricate your new dust boot with brake fluid, then place it over the piston (just the front part of the piston not all the way as you can see in the pic).
Next gently push the piston (making sure the bore and the piston is well lubricated) into the bore, make sure you do it straight and dont force it, it should go in no problem if you push it in nice and level.
Using your fingers tuck in the dust boot surrounds so that they are just flush with the outer rim of the bore
Now insert the retaining ring inside the bore making sure it does not go under the dust boot but rather over it, push it all the way back till it snaps into place in its groove
Below shows the retaining ring just on the outskirts of the bore (you just have to push the retaining ring further in till it snaps into the groove)
Thats it, repeat the process with the second piston, then test the caliper for actuation and that the dust boots remain in place
note: dont push the pistons completely out, just enough to test that the pistons are properly covered by the boot, and that the retaining rings are hold the dust boots in place)
The picture below shows me testing the caliper (i had a sanding block placed horizonatally to stop the two pistons coming out completely but removed it for photo sake)