The invention provides a multi-disc brake for a vehicle having a knuckle for supporting a wheel of a vehicle and a hub mounted for rotation on the knuckle about a rotation axis. The assembly communicates the tires with the air source through the axle interior using a conduit having a rigid portion and a flexible portion that extends between a support in the axle spindle and a rotary union housing secured against the outside end surface of the hub cap so as to be outside the wheel lubrication compartment and rotatable with the hub cap. Next, the photoresist layer is defined by a mask to form a rectangular opening, wherein the mask has two rectangular transparent patterns arranged with a predetermined interval. 2 to 5 alkenyl groups bonded to silicon atoms in one molecule, polyorganohydrogensiloxane having at least two or more hydrogen atoms bonded to silicon atoms in one molecule, and a platinum-based catalyst. The bioproduct production processes and systems utilize pretreatment of a carbohydrate-containing feedstock to produce soluble sugar molecules and continuous conversion of the pretreated feedstock to a bioproduct by an immobilized fermenting microorganism. The indicator comprises a thermostable kinase covalently linked to a biological component, with the proviso that the biological component is not an antibody.