That shouldn't be possible the guides for assembly at the top and bottom are pretty clear.
But if you should manage it anyways, the brakes will most likely come apart on the first time you use them.
Bleeder screws would be on the bottom of caliper-making complete air evacuation either difficult or impossible resulting in a spongy pedal
It may need new brake calipers.
too warn you that something is wrong with the brakes like you need calipers or pads
check brake hoses. check brake fluid condition, if fluid is contaminated or mixed with wrong fluid, calipers can lock-up or stick. check caliper bolts, hardware, caliper brackets. replace if broken, bent, or missing.
sounds like air is still in the system try bleeding system again
Pads not secured to caliper properly? Wrong pads installed?
Its probably broken so you you should go to a mechanic but I'm not a professional so i could be wrong
brake master cilinder might be gone
A car has to have brake fluid to allow for the effective operation of the brakes to stop the car. When we apply pressure to the brake pedal, brake fluid, which is largely incompressible, will transfer that pressure to the pistons that operate the in the calipers or the pistons that operate the brake shoes. Further, the fluid must be of the correct type for the system in which it is used. The continued safe operation of the brakes may be compromised by the wrong fluid.
uneven brake fluid pressure to one of the wheels, or bad/loose front end parts. brake culprits; bad brake hoses, frozen caliper brackets/slides, frozen calipers, or wrong fluid or incorrect fluid in the brake reservoir. suspension culprits; bad balljoint, loose upper or lower contol arm bushings, bad tire, or out of alignment.
It sounds as if there is not enough pressure in the system. This could be the result of a faulty master cylinder, or inadequate brake fluid. It is also possible the piston assembly in the calipers have a fault.
Does the car pull to one side at all when you brake? Even if it doesnt, the calipers could be frozen open which causes back pressure in the lines, making it hard to push the pedal.