I took my car for its MOT (which it passed) and asked the garage to also change the brake fluid as the brake pedal felt soft. When bleeding the brakes they noticed that the fluid flow from one of the rear calipers wasn't flowing as freely as the others.
With new fluid in the system the pedal is exactly the same as before, the mechanic suggested this could be because of the 'slower' bleed caliper rather than the master cylinder or servo as the other 3 calipers bleed at the same flow rate.
Can anyone confirm this would be the case and where I can get either refurbished or new replacement calipers.

thanks in advance