Mazda,Brakes won’t let go after changeing main brake cylinder.

OK, I changed the main cylinder (new part) because it went straight to the floor without brake power. Workshop said it was wrong fluid on the system. I changed all brake fluid and replaced with Dot +4.

After changing the cylinder the brakes locked. They do brake normally but does not let completly go, and my disks get hot. It is not impossible to drive, but the car struggles in 5th gear, and wont roll freely in gently downhill.
However, the problem is solved by pulling the pedal gently outwards and by doing so after each braking it is possible to drive. This happends on all 4 wheels.

My tro