My 2013 C300 pulls to the left when I apply the brakes at moderate speed. Cause?

Hello, a brake pull can be caused by multiple influences. First, the alignment should be rechecked if the concern happened directly after having it performed. Something could have been adjusted that is influencing this to happen. Beyond this, if the problem was happening before the alignment, you could have a hydraulic brake system concern or an anti-lock brake system concern. It's impossible to know without digging in with some hands on testing -- first mechanically checking out things and then if all that checks OK getting into module based diagnostic testing using a diagnostic tool capable of communicating with the chassis based modules of the vehicle. A workshop manual and wiring diagram is needed too. www.repairpal.com/repair-shops