What are Fixed Calipers (Non-Floating)?

A fixed caliper usually consists of 2,4,6 or even 8 pistons. A fixed caliper is mounted rigid to a bracket or spindle with no sliding pins or bushings in its mount. The fixed caliper consists of an equal number of pistons on both the inboard and outboard halves of the caliper. When you apply the brakes the pistons on both sides move at the same time and squeeze the pads against both sides of the rotor.