patrick_y[PuristSPro Moderator]
33617
What makes them special...
It's the feel, it's the performance, and it's the increased braking capacity.
Brembos have one of the most rigid brake calipers on the market. The rigid structure helps with the pedal feel. They have a "Fixed" design which offers superior pedal feel over the "sliding design" that is employed on most vehicles, including those by the major manufactures such BMW and Mercedes-Benz. BMW just started to offer fixed calipers on the BMW M5 and the 135i coupe, but predominantly uses sliding. Mercedes-Benz currently uses the fixed calipers on their CLS, SL, S, CL (only coupe and sedan models considered) and most AMG models with the exception of the S63, S65, CL 63, CL 65 models which have Dual-sliding calipers on the front brakes and fixed calipers on the rears.
In sliding calipers, the pistons (which are the devices that push the brake pad in contact with the brake disc) are all on one side, and braking first starts at one side of the disc until contact is made before the other side has contact. Imagine grabbing something with your thumb first and then using the rest of your hand.
In fixed calipers, there has to be at least a piston on both sides of the brake disc, and when the brakes are actuated, the contact of the brake pads are applied to the discs from both sides of the discs simultaneously. This allows for easier modulation, greater precision, and quicker response to the driver's braking inputs.