Re: Treadle vac disassembly snag

Posted by HH56 On 2019/5/25 20:22:15

You need to completely remove the power piston by disconnecting the hose and removing the screws holding the vacuum connector to the round shell and then removing that and also screws holding the breather to the shell. After the connector and breather is off you can pull the power piston out of the round shell. Once that is out, there is a large spring pushing against a round plate which is held to the master cylinder ram by a clip. Hold the ram and push slightly against the plate and spring to release pressure and remove the clip so the plate and spring can be removed. You will see some bolts holding the master to the round shell. Remove the bolts and the master will separate from the shell. There is another clip in a groove in the master housing that is holding the parts of the seal assembly to the master. Remove the clip and since the compensator valve is already out the ram and seal assy will pull out.

Inspect the surface where the seal rests in the housing for any pits and corrosion. Make sure there is nothing that would let fluid leak past the outer diameter of the seal.