Caliper Disc Brake Balanced Design CDB2329A–BAL

Technical Specs

Maximum Torque - Series Wound 1/2 h 4,000 lb-ft
Maximum Torque - Series Wound 1h 2,600 lb-ft
Maximum Torque - Shunt Wound 1/2 h 4,000 lb-ft
Maximum Torque - Shunt Wound 1h 3,000 lb-ft
Drum Brake Replaced 23 in
Disc Diameter 29 in
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Features of the CDB2329A-BAL

Caliper Disc Brake Balanced Design

PT Tech's new CDB2329A-BAL replaces existing 23" drum brakes and conforms to the new AIST brake standard. The dual acting calipers minimize shaft bending that occurs with single acting calipers. They are typically used on extended gearbox shafting or motors that are not built to mill duty standards.

If the installation conforms to AIST's dimensional standard for DC mill motors, then when ordering all that is required is the DC mill motor number and existing electrical coil specifications. In all other installations, please provide a drawing of the existing brake drum. 29" inch disc replaces an 23" drum.


The CDB2329A-BAL caliper disc brake provides higher performance and easier maintenance than the drum brakes it replaces. Upgrading your crane with PT Tech's CDB2329A-BAL will result in the following advantages:

  • Wear adjustment is far easier.
  • Less frequent need for wear adjustments.
  • Improved wear life.
  • Replacing friction pucks is substantially quicker.
  • A set of friction pucks weighs only 4½ pounds.
  • Eliminates drag and slip problems due to drum thermal expansion.
  • Significantly better resistance to heat checking
  • Dual calipers to minimize shaft bending
  • Spring applied
  • Electrically released
  • Installation requires no modification

PT Tech supports its commitment to excellent field service with a large inventory of parts and a 24-hour emergency service. When Converting The CDBA directly replaces an 23" drum brake. It has the same mounting footprint and torque capacity as an 23" drum brake. When converting, it is critical that the disc's centerline is in the same position as the drum's centerline. Single-acting caliper disc brakes impose a bending moment. Shafting should be reviewed prior to installation. Consult PT Tech. In most cases, PT Tech can suggest mounting adaptations for non-standard drum brakes.