I deleted all the Key asignments, also all the joystick assignments and only has the Saitek rudder pedals assigned to brakes.

All my other planes work fine , but the A2A 172 has brakes ON all the time and if I push the brakes they are still ON or I get the differential brake message.

 

Any ideas?

 

Do you have FSUIPC installed...? If so, try this: open fsuipc.ini, search for 'BrakeReleaseThreshold = 75' and set it to '0'.