Ok,I've been chasing a brake failure light problem on my 1990 240DL.Today I re-bled the system using a "Motive Bleeder" that I borrowed.All the air is out,all new fluid in.For a moment the light went out then back on.I checked the "block" and switch.The block is dry and the wireing to the switch intact.It started to rain so I couldn't undo the switch to clean the contacts.I may also remove the block and try to clean the sliding piston but first I will order a new one just in case.While stepping on the pedal I did notice a swooshing sound.Could this be part of the problem and what would cause the pedal to make such a sound? I have a high,firm pedal that does not sink at all.I may try a 2 prong approach to the bleeding before removing parts.First bleed one caliper with the "Motive" followed by a firm push on the pedal then move on to the next caliper, bleed followed by a firm press.One side note,I could not find my Bently so I looked at a Haynes manual I have for the bleeding order.Interesting that the Haynes shows the front calipers with 3 bleed screws but my front calipers have only 2.????