I'm working on a fail safe brake along the lines of an elevator safety brake -- it will prevent a heavy load from falling if the supporting roller chain breaks. I need brake pads that can be attached to the device that will bear on a large rectangular tube column when activated, 4 pads near the corners of the column. I found some rough dimensions online of performance auto disc brake pads that are about
2" square, which seems appropriate. The four pads will be required to support about 3000 pounds total.Potential problems with automotive pads? Any suggestions other than auto pads? McMaster has lining material, but I'd rather not design and fabricate something that can be more easily purchased.