Guest northern wayne Posted October 6, 2015 Share Posted October 6, 2015 (edited) Brake pedal went to the floor a couple of times....decided to rebuild the master cylinder. 1957 power brakes, RoadmasterNoticed on the teardown that the power piston had a corroded area. I thought that with all the other new parts from "Fusick"? I might be ok. Put it all back in and "no-go" so it is all apart again and I need a power piston. Anybody know where I can get one???? Wayne at wmpruden@mymts.net Edited October 6, 2015 by northern wayne (see edit history) Link to comment Share on other sites More sharing options...
old-tank Posted October 6, 2015 Share Posted October 6, 2015 (edited) Probably similar to my 55 which originally had a cast iron rod that was hard chrome plated. Mine did not have pits, but broke when dropped. I had a machine shop duplicate in stainless steel and I polished...that was in 1984. Edited October 6, 2015 by old-tank (see edit history) Link to comment Share on other sites More sharing options...
buick man Posted October 7, 2015 Share Posted October 7, 2015 northern wayne: Could you post a photo of the piston stripped down to just the piston ? Is it just corrosion on the shaft or has the corrosion eaten into the areas where the seals seat or ride ? Ether way one can use a high grade 2 component metal epoxy to fill in the erosion pits along the shaft itself if just minor and not out of true before considering a complete replacement. Or one can obtain a couple of used units and scavenge for parts which is always a good Plan B in any scenario. Link to comment Share on other sites More sharing options...
Guest northern wayne Posted October 8, 2015 Share Posted October 8, 2015 Hmmm....I will try to post a photo. I had sent a number of photos to Fusick (good people, by the way)and they helped clear up one mystery, it seems my 57 Roadmonster has 1958 Power brakes. Perhaps car was made late in the model year? The displacement shaft is corroded three quarters of the way around and in a band measuring about three eighths of an inch, plus or minus. The only roughness in the bore of the cylinder is in an area where there is a notched spacer about one inch in height that fits in loosely. So I do not imagine this area would cause me any grief. I have located , through Fusick, a supplier for the shaft ($80 US= about $104.00 Canadian.) I also have a tool maker friend that is going to look at it and perhaps make one for me., He builds amazing miniature engines!! Link to comment Share on other sites More sharing options...
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