Re: Booster and Master Cylinder

Posted by HH56 On 2009/3/2 12:16:38

Just did a search for treadle vac and came up with several forum hits for other makes. Lots seem to be having issues with the sticking pedal for various reasons. Their respective gurus all pretty much say wrong lubrication, binding linkage or corrosion inside can.

Did not see anything that jumped out re outright failures other than a chevy guy mentioning the spring on comp valve and links to Craig's site and a few to Pinfo. Lots of people are wanting to update or change mostly due to cost & parts availability & looking for alternatives. PV8's conversion to a Honda unit from a post on AACA, and Craigs Panther site is mentioned. Didn't see anything re Erics Ford unit conversion.

One of the rebuilders stated that a good rebuild could not be accomplished without "extensive machining" of the MC which his shop did but others didn't do & just changed the seals. That was a guaranteed failure in short order was his feeling.

There was an article from a Hemmings magazine about the gradual demise of the unit by early 60's and their conclusion seemed that it just couldn't compete. There were similar units made by others, mfg's wanted larger vacuum portions for more power, and firewall mounting requiring thinner & more flexible units were coming in vogue.