Liquid cooled brake

In a vehicle having an engine having a coolant flow passage, a radiator, and the brake having a brake shoe, the improvement comprising:

• radiator having an inlet and outlet;
• the engine and the radiator coupled in a first coolant flow loop between a coolant passage in the engine and the radiator;
• a second fluid flow loop coupling the engine to a vehicle passenger compartment heater having an inlet and an outlet;
• the brake shoe having an annual rim carrying a layer of a brake friction material on a radially outer surface, and a fluid flow passage carried on a radially inner surface of the rim for circulating fluid past the rim to remove heat from the layer of brake friction material when the layer of brake friction material engages a rotating brake member;
• a brake fluid flow loop fluidically coupled with the second fluid flow loop;
• and
• a valve coupled between the second fluid flow loop and the brake fluid flow loop to selectively divert fluid from the second loop through the fluid flow passage in the brake shoe.