| 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-BFor 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-SIncludes the complete 2900-S-B kit plus an electrical solenoid to disengage the brakes while backing. 
Model 2900-S-VNull'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-ASame 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-CNull'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. |
