I just bought a used GC20SC-5 (Serial# PI-00323). It just got new brakes before I got it, and they feel a little soft to me. Not really like air in the lines, but you still have to stand on the pedal to get them to stop in a hurry. I only have experience with trucks that have conventional drum brakes, and those seem to be a lot "grabbier" than these oil cooled brakes. Is that normal? Or did they not get serviced correctly? Perhaps wrong oil for the brakes? I'd like to have some info before I contact the seller about this. Thanks for any help.