Relay valve control arrangement to provide variable response timing on full applications

A brake system comprising:

• at least one fluid pressure source;
• at least one brake unit;
• a pressure delivery line for delivering pressurized fluid to the at least one brake unit from the at least one fluid pressure source;
• a control valve operative to receive a control signal indicative of a level of requested delivery pressure and, in response thereto, open to permit the flow of pressurized fluid through the pressure delivery line to the at least one brake unit to thereby supply a requested delivery pressure to the at least one brake unit;
• and
• a control circuit in communication with the control valve for controlling the control valve;
• wherein the control circuit includes:
• a user input device operative to generate the control signal indicative of a level of requested delivery pressure;
• and
• a metering device in communication with the user input device and configured to regulate the control signal received from the user input device such that the control valve delays full supply of the level of requested braking pressure for a prescribed amount of time;
• wherein the control circuit is a fluid control circuit, and the metering device includes an orificed check valve and inversion valve in the control circuit between the user input and the control valve, the inversion valve operative to permit relatively unrestricted flow of fluid through the control circuit to the control valve up to a prescribed threshold pressure, and to meter flow through the control circuit to the orifice check valve above the threshold pressure.