Fluid Reservoir Operation

The fluid reservoir is a storage tank for brake fluid under atmospheric pressure. A vented cap allows air into and out of the reservoir. The reservoir has a permanent filter inside it. Fittings and a hose connect the reservoir to the inlet of the pump, providing it with clean fluid A fitting from the reservoir connects to the booster. This allows the booster and rear channel fluid to be under atmospheric pressure when the system is at rest. Another reservoir fitting connects to the master cylinder. This connection allows three things to happen:
^ Allows master cylinder to have fluid under atmospheric pressure during no braking and non-antilock braking.
^ Allows front channels to have fluid under atmospheric pressure during no braking.
^ Allows LF, RF, and rear channels to have fluid under atmospheric pressure during the pressure decrease part of the antilock braking cycle. The reservoir contains a fluid level sensor, which is part of the cap or reservoir body. This sensor has contacts for the "BRAKE" warning lamp circuit. It also has contacts for an EBCM circuit, which affects the operation of the "ANTILOCK" warning lamp. The "BRAKE" contacts will close when fluid level is low, and the "ANTILOCK" contacts will open with low fluid level.