My thoughts exactly. If it is not a new one, I'd toss it and buy one specifically for disc and be done with it. The drum car masters from that era typically have smaller reservoirs that require frequent/annual checking when used for discs to prevent them running dry when the pads wear down. The biggest problem is that when you refill them as the master empties you end up with extra fluid in the system. If you don't carefully remove it before installing new pads it pukes all over the place. usually on your nice painted inner fenders... Mark Price Morgantown, WV 26508 1969 AMC Rambler, 4.0L, EFI, T-5 2004 Grand Cherokee Laredo, 4.7L, Quadratrac II "I realize that death is inevitable. I just don't want to be around when it happens!" ----- Original Message ----- From: "Sandwich Maker" <adh@xxxxxxxxxxxxxxxxx> To: amc-list@xxxxxxxxxxxx Sent: Tuesday, June 16, 2009 11:55:40 AM GMT -05:00 US/Canada Eastern Subject: Re: [AMC-list] Brake and Bearing questions " From: Wayne E Lamothe <superglider@xxxxxxxx> " " " I am adding disc brakes from a 78 Pacer to my 69 Ambo and have most of " everything assembled but do have a couple of questions what are you doing for the master cylinder? your original will have a residual pressure valve on the front outlet the disks won't like. ________________________________________________________________________ Andrew Hay the genius nature internet rambler is to see what all have seen adh@xxxxxxxxxxxxxxxxx and think what none thought _______________________________________________ AMC-list mailing list AMC-list@xxxxxxxxxxxx http://list.amc-list.com/listinfo.cgi/amc-list-amc-list.com _______________________________________________ AMC-list mailing list AMC-list@xxxxxxxxxxxx http://list.amc-list.com/listinfo.cgi/amc-list-amc-list.com