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 non-corrosive alloy bronze. Model 2900-S-B
For use with reverse manual lockout actuators on a single axle trailer. The kit includes: 2 ea. 2901-S caliper assemblies, 2 ea. 2902-S mounting brackets, 2 ea. 2970 rotors, and mounting hardware.
Model 2900-S-S
Includes the complete 2900-S-B kit plus an electrical solenoid to disengage the brakes while backing.
Model 2900-S-V
Null's patented "Free Backing Disc Brake System" for a single axle. The kit includes: 1 ea. 2901-S brake assembly, 1 ea. 2902-S mounting bracket, 1 ea. 2905-S brake assembly, 1 ea. 2906-S mounting bracket, 2 ea. 2970-S rotor, 20 ft. of return line, and mounting hardware.
Model 2900-S-V-A
Same as model 2900-S-V but includes 6000 lb. surge actuator that is designed for use with Null's Free Backing Disc Brakes.
Model 2900-S-V-A-C
Null's flagship system includes model 2900-S-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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