After six months with no advances to my problem and the car a month or so away from going on the road I have returned to the problem.
I have read that if the ABS module has a sticking valve then the pedal stroke will be longer than it should be.
I have noticed that with the ignition OFF the pedal travel is what I would expect with the engine running, turn on the ignition and the pedal drops considerably. I put this down to air trapped in the ABS module but as the peddle is rock solid in use l now think it is a sticky valve.
I have acquired a used ABS module from eBay, three cans of Motul 600 and plugs for the brake lines. I also have the DRB III Emulator just in case it can help somehow, it does not actuate the module to bleed it though.
Has anyone any experience in changing the ABS module and replacing it? Or activating the ABS valves so that any stuck valves would come loose.
I would be grateful for any help on this matter, there are others with the same problem.
I have also received the powered base from an SLK 320 to put in the car. I think I have more energy than the Eveready Bunny.