I just finished that job today on my daughters 90 300ce. New rotors, pads, hoses and sensors all around. I replaced the CPS first (getting a code but ran fine), while the car was on the jack stands and soaked all the hose connections with repeated PB Blaster applications for 2 days, and they unfastened without any drama. Car does not have ASR so cannot speak to that. Refilled the system with a Motive pressure bleeder, but I think I still have a little air trapped in the bowels of that thing as the pedal travel is longer than it should be. Need a helper to old school activate the pedal, whilst I open and close the bleed valve at the caliper.
Rebuilt 3 of 4 calipers, the drivers front had one piston seized. When I finally extracted the piston it was severely rusted and pitted. Think you can find a new 38mm ATE piston for this beast? Nope. Pelican's supplier unfortunately didn't have a rebuilt caliper in stock either. Sooo rather than scrounge at a salvage yard I ordered a new caliper from the stealership. Had to come from Germany, none in the country, and only 20 left. :-(