a misrouting of the positive battery cable may exist. as a result, the positive battery cable insulation could be damaged from exhaust manifold heat. the wire in the cable may then contact and damage the metal brake tube.
during testing of the fire apparatus, extreme heat generated from the right side engine exhaust manifold, resulted in damage to the brake hose at the frame fitting. this could cause a leak in the front axle hydraulic brake hose.
the hydraulic steel brake tube connecting the brake hose to the left or right front top wheel cylinder may develop a fracture in the bend next to the wheel cylinder. this fracture results from periodic high stresses in the tube due to "brake chatter" which can occur during certain environmental conditions.