Daf LF55 ABS Lamp

Hi

Just wondered if anyone could help with an ABS fault?

My 2011 LF has a fault, checked code with my Delphi and bringing up DTC 55-5, brake pressure limitation sensor.

I’m sure I changed this last year, little pressure switch towards the rear of the chassis. Changed the hanbrake one at the same time.

Haven’t had chance to pull it out and look at it yet, just check code. From memory the old was had some sludge in it. The ABS lamp only came on last week when the weather turned cold.

Just wondered if these switches freeze up and if its worth draining air tanks and changing air dryer filter?

Cheers if anyone can help.