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2017-03-12 19:27:59 2007 stralis trailer parking brake slow to release

Hi first post here, hopefully someone will be able to offer some advice for a fault I'm having with a 4x2 stralis wagon and trailer. the parking brake is slow to release on the trailer and its becoming an issue as the lorry is used for driver instruction.

so far the trailer control valve at the rear of the truck has been replaced along with the relay valves on the trailer its self, which have made no difference. Ive checked along the park brake signal pipe for kinks etc but all is ok, ive not had a pressure gauge on the signal line yet but when its off and you work the parking lever there seems to be plenty of air comes out of it.

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