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I blew out the cylinder of the PDB caliper #633 casting on the 69. What is the best way to remove the rubber gasket and the ring of the inside of the cylinder? Figured I would rebuild the calipers for $12 bucks instead of buying rebuilt 633's for $96.
 

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69 Calipers are very simple/easy to rebuild... mostly cleaning and then replace the two rubber parts... (fluid seal and dust seal)...
 

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Al - Waterloo, Iowa
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Use a screwdriver to carefully pry out the dust boot. Be careful not to damage the piston. I use a cotter pin removal tool or 90* pick to remove the internal seal. Again be careful not to damage the bore. It's very straight forward once you get into it. I would do both sides. If one blew the other's probably not far behind. Check out youtube.
 

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Make sure to check the cylinder and piston for pitting. If all looks good assemble using plenty of brake fluid on the seal, piston and cylinder.
 
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