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DAF 80 trailer brake error?

We have DAF 80(Leyland 1991) truck
there is a error on that.
trailer have brake enough, but the machine doesn't have brake well.
when we check it always pump air to trailer. is it a normal thing or is there any error with valve
plz answer me
thanks
Rajitha, April 2016
link Click here to see other fixes for DAF 80.