I also suspect you have a seized caliper or piston on the left side, this happens to my other car if I don't lubricate caliper rail every year, when this happens you can tell by touching rims by finger, the one has problem is always warmer than the others.
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.