My new trike has horrible rear brakes for two rear disks and eight pistons in the calipers. I originally thought the installing dealer did not get the brakes bled out properly so I took it back and they bled them out but said there was no air in the system. Still felt exactly the same, so I did the system bleed myself and even took the calipers off and tipped them up to make sure all the air was making it to the bleeder, got no air!
I felt that maybe its the quality of the rear pads, the front pads are Honda and look like ground up copper fragments but the rear look like organic material of some sort and appear to be super smooth and polished looking (shiny) I flat sanded them on a sheet of 320 sandpaper and had awesome brakes for about 4 days,... I'm sure they are "slick" again. So do they offer better pads as an upgrade? Mine are the CSC 4 piston red aluminum calipers.