Update: First, thanks to Marshall Goodnight for putting a vacuum gage on several C300 engines. The vacuum from Marshall and others range from 14" to 17", with 17" marginal but adequate. My car sees 14" - 15" under most conditions. I wonder if the factory took the cam into account when designing the system? I also wonder if the K-H system was only used for one year - then to mitigate a problem we started to see Vacuum canisters on most of our cars. So, after 120 miles on the pads and considerable research I am down to 3 known options: 1. Add a '56 style vacuum canister which may help a little in city driving but the 14" is still a problem? 2. Add a vacuum pump ($200+). These are marketed specifically for cars with radical cams. They make noise but are switched on at 17" and run to keep the vacuum at 21" . See: http://www.getdiscbrakes.com/evp01# 3. Live with the system as is which offers about the same braking ability as the '55 factory set up but with the safety of dual M/C and no fade. Opinions please. Thanks .Jack Jack Boyle (913) 544 4650 Enjoying the same C-300 since 1967 IMG_0623 small [Non-text portions of this message have been removed] ------------------------------------ Posted by: "Jack Boyle" <jackcboyle@xxxxxxxxx> ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to https://groups.yahoo.com/neo/groups/all/manage/edit For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang ------------------------------------ Yahoo Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: Chrysler300-digest@xxxxxxxxxxxxxxx Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo Groups is subject to: https://info.yahoo.com/legal/us/yahoo/utos/terms/