The brake modulator is used to control individual or in this case LH side of the tandem drive. Using the input from the wheel speed sensors the computer will command the modulator to cycle exhausting service brake air to the atmosphere and preventing the wheel from locking up. A three wire connector is used to control the inlet and exhaust solenoids in the valve. During normal operation the service air bypasses the exhaust port and is routed directly to the brake chambers.
Concise. Just what I wanted.
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