Hi, Claas 3800 Xerion, when we plug the trailer brakes in the air tank fills, but then when go to drive away the brakes won't release? Looks like the tractor won't release the parking brake. Tried the trailer on another tractor and worked fine.
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That was my first thought as the dealer changed the couplings for UK ones but no they are correctAir fittings wrong way around?
Air valve is on right hand side inside right hand wheel by the post that supports weight frame. Under the main air brake valve there are some little electrical operated air valves one Is for the hand brake will be stuck, you can bung the air pipe off or try and free up the valve
Thanks will check thisStart the tractor up, choc the wheels and press the middle of the red (female coupler) with a punch. The air should come out regardless of the handbrake being on or off.
next press the middle of the yellow (male) coupler. With the brakes applied, air should pour out. With the brakes off, no air should be released. Is this what is happening?