A vehicle includes a traction unit for delivering mechanical power from a combustion engine to a vehicle drive shaft and driving wheels, electric loads and a vehicle cooling loop for cooling vehicle components andor said combustion engine. The cover plate is mounted over the receptacle and has apertures for plug blades. The method also includes detecting at least one impedance in the fluid by a sensor unit having a sensor plate. The clamping device is axially fixed in relation to the brake disc, in order to facilitate that the brake pads are given a symmetrical movement in relation to the brake disc. The resist has a dipole moment \u03bc value equal to or higher than 2, or has a solubility parameter value lower than 6 12 or higher than 11 12. These second group devices are also bi-directional and buffering depends on the particular function, e.