Some eagle-eyed observers of the Canadian Grand Prix weekend may have noticed Mercedes in a race against time to fix a hydraulic leak on Lewis Hamilton’s car before race day, the leak discovered on the champion’s car on Saturday night. Mercedes being Mercedes, the engineers got to work and removed Hamilton’s engine and floor to rectify the problem and all was right in time for race day. During race commentary, there is often the mention of hydraulics and hydraulic problems, and yet this complex area is rarely fully delved into.  This isn’t the brake hydraulics, nor the hydraulics used for the passive suspension, rather what the teams call ‘Control Systems’. These have been in F1 since 1983, with testing preceding over a year before that.  Back then, it was Lotus using hydraulics to actively control the suspension using aircraft-based hardware, as the need to control flying surfaces is effectively the same engineering solution as controlling suspension.  This technology has subsequently been applied to many other systems on the car and nowadays every F1 car has a complex hydraulic control system, used to operate nine sub-systems on the car.  From a clunky and unreliable arrangem...