This disclosure relates to a method for producing and using catalysts in the production of bisphenols, and in particular to a method for producing catalysts which contain poly-sulfur mercaptan promoters, and using these catalysts in the production of bisphenol-A and its derivatives. A circumferential array of exhaust struts extends across the gaspath. The wafer carrying the pattern of adhesive pads on its active surface is singulated into individual dies, each die having an adhesive pad thereon. In one embodiment, a single boost chamber provides fluid pressure to operate the master cylinder and to provide a brake pressure indicative opposing force to driver input.