Hi, I have just replaced the wheel cylinders on my 1988 Diahatsu Fourtrak F75 - however the parts I ordered, as in the manual arrived with a 7/8" (22.23m) piston dia but i found the ones I took off were 1" (25.4mm) - I have fitted the new ones and bled the brakes but they don't work! - Any advice would be much apprecieatd! AndyB