When I turn the engine off on my Cargo 0811 1987 the air hisses and the brake cylinders empty. The brake light also stays on when the parking brake is released. Didn't notice any problem whilst I was driving it and the air cylinder remained at its correct pressure until I turned the engine off and then the cylinders both empty but this slowed down when I released my parking brake. Started lorry again and one cylinder fills quicker than the other. Why does this happen? Thank you

Lisa, January 2014

it will be leaking out of theair dryer, which you will find near the rear axel you need to get this sorted asap

james, February 2014

Lisa you basically have an air leak ,find where the hissing is coming from ,and that isyour leak

norb, January 2014