MICO 691 Brake Lock Systems lock hydraulic pressure in the service brakesto supplement the vehicle’s original equipment parking brake and provideextra holding in heavy-duty and high frequency applications. These systemsalso function as an interlock to apply pressure to the service brakes whenother vehicle mounted equipment is being used.The 691 System consists of a small electrohydraulic pump, remote mountedactuator (single and/or dual), electronic control module, and a small dashmounted user interface. The operator simply activates a switch and the 691System automatically applies, monitors, and maintains brake-locking pressure.A 691 Brake Lock will significantly enhance vehicle holding capability whilenot interfering with normal service brake function. For vehicles over 19,000# GVW Used on international 4600-4900 models Four channel anti-Lock system Self contained actuation system 800 psi line pressure Self monitoring Simple to operate; activates with a flip of a switch Does not interfere with normal service braking Provides added safety for vehicle, operator and work area Supplements existing parking brake for additional holding