So I got a tip on a problem part, a Mercedes Benz ML320 Steering pump. Looks like all 1998-2005 ML pumps are failing at very high rate. I’ve heard complaints of noise, low assist, pressure problems. Looks like bad bearings in the pump. The same part fits all of the ML series, including ML320, ML430 and ML500.

The good news is that the price on these has come down a good bit. They used to be about $600. CarSteering.com (1-800-399-7845) has these at $385 Original Equipment or $285 for their brand. Good people there and the best warranty I have heard of.

The other good news is that the new ones are re-designed and fixing the problem. Much better bearing pack internally. Just make sure you do a flush on the system and get good clean fluid in there. Otherwise you could ruin the whole Mercedes Steering Rack which is a much bigger problem.