Lift Axle Braking System

A brake system comprising:

• an electronic trailer pressure control module (eTPCM) comprising an input port and an output port;
• a braking controller configured to cause the eTPCM to selectively allow pressurized air to flow from the input port to the output port;
• and
• a lift axle brake sub-system comprising:
• at least one brake;
• and
• a towed vehicle anti-lock brakes system (TABS) unit comprising a valve configured to selectively open to allow pressurized air to flow from the reservoir to the at least one brake;
• wherein the valve is coupled with the output port of the eTPCM, such that the valve receives pressurized air from the output port of the eTPCM when the braking controllers cause the eTPCM to allow pressurized air to flow from the input port to the output port, which cause the valve to open and allow pressurized air to flow from the reservoir to the at least one brake.

A vehicle comprising:

• a towed vehicle braking system;
• a lift axle;
• and
• means for braking the lift axle by treating the lift axle as a towed vehicle whose braking is controlled by the towed vehicle braking system.