To order these models for tandem applications, add a "T" to the end of the model number. The 2900-1 Series is also available in steel.

Model 2900-B-B For use with reverse manual lockout actuators on a single axle trailer. The kit includes: 2 ea. 2901-B caliper assemblies, 2 ea. 2972-B mounting brackets, 2 ea. 2971-B rotors, and mounting hardware. Model 2900-B-S Includes the complete 2900-B-B kit plus an electrical solenoid to disengage the brakes while backing. Model 2900-B-V Null's patented "Free Backing Disc Brake System" for a single axle. The kit includes: 1 ea. 2901-B brake assembly, 1 ea. 2972-B mounting bracket, 1 ea. 2905-B brake assembly, 1 ea. 2976-B mounting bracket, 2 ea. 2971-B rotor, 20 ft. of return line, and mounting hardware. Model 2900-B-V-A Same as model 2900-B-V but includes 6000 lb. surge actuator that is designed for use with Null's Free Backing Disc Brakes. Model 2900-B-V-A-C Null's flagship system includes 2900-B-V-A plus the following accessory package: 2 ea. 2900-S-H hub assemblies including bearings, studs, lug nuts, and dust caps, 2 ea. 3002 flex lines, 20 ft. of return line, and mounting hardware.

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