Again...REALLY depends on the brand of brakes! Airpower for example dont do well greased, intairco dont do well with petroleum or automotive type silicone. The "overpriced lube BVM sells" is Parker Super O-Ring lube which works better than most other types of lubricants and is completely compatible with Oring type brakes. It Lubricates without deterioration of synthetic rubber. Do a seach for this product and I think you will find his price is in-line. Other options are; Krytox made by DuPont and Clearco 100M "O" Ring Lubricant but both products are comparable in price.