Brake Warning System Description Warning Systems

Warning Systems

Light duty cutaways and school busses equipped with a hydraulic power brake booster system have a warning system. This system alerts the driver to a malfunction in the hydraulic power brake booster system. The BRAKE warning lamp illuminates if the fluid flow or pressure from the power steering pump is low.

Power Brake Booster Fluid Flow Alarm Switch

Light duty cutaways and school busses use a flow switch. The flow switch senses the volume of fluid supplied from the power steering pump. When it sense fluid flow that is inadequate, it signals the alarm module. The flow switch is located in the power steering pressure pipe near the pump.

Power Brake Booster Fluid Pressure Alarm Switch

Light duty cutaways and school busses use a pressure switch. The pressure switch senses fluid pressure entering the hydraulic booster. When the pressure switch senses that fluid pressure is inadequate, the switch signals the alarm module. The location of the pressure switch is near the hydraulic brake booster.