Ignition on: The electrically controlled parking brake releases if the button is not held. Ignition off: The electrically controlled parking brake releases if you hold the button for less than 3 seconds. Fault in the transmission of the message concerning the partial wake-up by the electronic parking brake: Coherence. Took my second hand 57reg C4GP into local Citroen garage today as the Automatic Parking brake fails every time - works manually thank goodness. (Initially it was an intermittent fault that would occasionally appear when I was driving and after being into that garage previously they were unable to find the fault and it stopped occurring but now Firstly - Handbrake Faulty, then. Secondly - ESP /ASR System Fault and in both cases the corresponding visual graphics. Also on the application of handbrake switch, it will not auto release when car moves forward, I have to off the ignition and it will then release when car moves forward. Also switching off ignition does not auto apply handbrake. How to fault find the C4 parking sensor system. Citroen C4 and DS4 Online Support with user help forums, FAQ's and Technical guides C4 Picasso 1.6HDI ETG6 2014 .

citroen c4 grand picasso parking brake fault