The Park Tool DT-4 Disc Brake Mount Facing Tool, click to enlarge

Item # DT-4

(discontinued) / Tools / Brakes / Frame & Fork

Disc Brake Mount Facing Tool

The DT-4 has been discontinued and replaced by the DT-4.2.

Engineered and built to accurately face frame and fork mounted disc brake posts. The DT-4 machines the posts parallel with each other, perpendicular to the rotor, and to an equal height.

View Product Details

DT-4 Features

  • Includes axle for 135mm spacing frames with the standard 10mm axles (open dropouts), and also works with 130mm spacing
  • Includes axle for 100mm spacing frames with the standard 9mm axles (open dropouts)
  • Fits 12mm thru-axle frames using the included spacer and axle from frame
  • Fits 15mm thru-axle forks using the included spacer and axle from fork
  • Fits 20mm thru-axle forks using body of DT-4 directly, no spacer required
  • Includes two "parallelism gauges" to accurately adjust cutting tool

NOTE: For sharpening services of cutting tools see Park Tool Sharpening Services. Always use cutting fluid such as Park Tool CF-2 when machining.

Repair & Service


Parts & Accessories


Replacement Parts


Upgrade Kit for DT-1 and DT-4



Stay on the Cutting Edge

Use Park Tool Sharpening Services