you have to have bleeders so they must be broken off,,bleeding the line at the cyl willnot do the job of air bleeding from the cyl..you can remove the cyls and soak in a rust buster and try to remove the bleeders with a easy out,,if you drill the bleed be carefull if you go to deep you will get into the bleeder seat and the cyl will be junk..how costly are the cyls???I have a parts store that seems to get my brake parts for older treasures...doc
