Best mod I ever made on 5er
I installed Kodiak. Single piston, GM metric design full floating, single piston cacalipers with pads available abywhere car parts are sold('90s mid size cars). Dexter is the other available major brand. Fixed 4 piston caliper, expensive pads available from Dexter
The plus for Dexter is that you can replace pads by pulling a big cotter pin without pulling the calipers -not a selling point to me. You need a 1/2" wrench and 5 minutes to pull the Kodiak calipers to replace pads.
My guess and only a guess is that Dexter has contracted a company like Wilwood to manufacture their calipers as they sure look like what I have on my street rod.
You have 3 major choices for actuator - Dexter, Titan and Hydrastar. I like the Hydrastar as it is all metal.
You have 3 choices for brake lines - (1) all metal with rubber lines between the moving and stationary parts. With a Kodiak full floating caliper, you also need a rubber link as well since the caliper has a moving link. (2) A Kodiak all rubber set of lines or (3) a hybrid of metal and rubber which I've opted to use.
When (IF) you decide to go with discs, add a few bucks and get the E-coating. I forgot to specify that coating and the rotors need a yearly spring rust removal.