They are very easy to rebuild and have 2 parts in each kit A square cut O-ring and the dust boot. All you need is an air compressor and an hour. Place a 1x4 board in the caliper throat in place of the pads. Reduce your air pressure to around 50-75 lbs. Wrap the assembly in an old bath towel to cut the mess. Put compressed air in the brake hose port and blow the piston out, pry the dust boot out. Clean everything really well. Sand the inside of the caliper bore with some 180-280 grit paper depending on how rusty and cruddy it is in there. Remember the caliper bore IS NOT a sealing surface. So you just need to get the crap and rust out and off the bore. Surface finish is not critical. Now the piston is a different story. The piston OD is a sealing surface and if it has rust on the sides, replace it. They are available. They are flash chrome plated and it is not recommended to wire brush, wire wheel or sand them. Lube up the piston, the bore, and square seal. Install the seal in the bore and the dust boot on the piston. Use the 1x4 about 16" long to push the piston and dust boot into the caliper body. Use the board to rock the piston slightly as you push to get the piston past the square cut seal. once in, seat the dust boot carefully. You can make a home made dust boot tool out of scrap PVC pipe or you can carefully seat it with a brass drift. Seating the dust seal without the special tool can be a little tedious, but it can be done with some patience. That's all there is to it. Good luck.
|