Good Morning, all I have an Audi a4 (2009) with a front right sticking brake.  I have had the car at a garage, and they were not able to find the fault (i've also checked/ changed a few parts myself). I took it to Audi in the end and their mechanic diagnosed water in the servo/ master cylinder and quoted for replacement. They claim debris under the scuttle panel was blocking the drain holes. I've taken the scuttle panel off and cleaned it as best as I can - there was some debris but no