Wilwood Black Dynalite Front Conversion with 11-Inch Drilled/Slotted Rotors for Triumph TR4A, TR250 and TR6 (Listed 1965–1976 Applications)

This Triumph front package combines black Dynalite calipers and 11.00-inch drilled/slotted rotors with separate hats for the original hubs. Four-piston service braking replaces the documented two-piston arrangement, and braided hoses are included for the conversion. It covers the stated TR4A, TR250 and TR6 rows rather than every Triumph model. Check the 15-inch nominal wheel recommendation against actual inside clearance. Based in Camarillo, California, Wilwood Engineering was founded by Bill Wood in 1977. Its disc brake systems serve motorsport, street-performance and specialized applications. The range includes calipers, rotors, master cylinders, valves, fittings and brake lines, with each component chosen for its role in the complete brake installation.

Technical Details

• Manufacturer part number: 140-15912-D. Quantity: one kit for the stated axle/application.
• Mounting hardware and the specified pads are included. Spindles, master cylinder and brake booster are not supplied.
• Service caliper: Forged Dynalite Internal; 4 pistons; stainless piston material. Lug mounting, black powder coat finish.
• Published piston bores: 1.62, 1.62 inches. Supplied pad compound: BP-10.
• Caliper hydraulic inlet: 1/8-27 NPT.
• Rotor specification: 11.00-inch outside diameter × 0.81-inch thickness; SRP drilled & slotted faces. Iron construction; SRP Drilled Rotor design; published vane configuration: 30 V.
• Rotor hats: aluminum, black e-coat finish; Big Brake Hat - Short Offset. Hat offset: 0.725 inch.
• No replacement wheel hubs are supplied; retain or provide the documented matching hub arrangement.
• Wheel mounting pattern: 4 x 4.00 inches.
• Minimum nominal wheel diameter: 15 inches. The wheel must also clear the actual caliper and rotor profile in the installation drawing.
• Included braided flexline kit: 220-15921 (15.00 in). Confirm the chassis fitting and routing for the actual installation.

Fitment & Compatibility

Listed Triumph applications are TR4A 1965–1968, TR250 1967–1969 and TR6 1968–1976. Match the exact model row rather than merging these into a blanket year range. The conversion bolts to the documented original spindle, retains the original hubs and supports the specified wire-wheel knock-off mounts without changing track width. Check the 15-inch wheel drawing and use the supplied flexlines with suitable routing and chassis connections. Use the complete application table below for the individual year, submodel, brake configuration and note attached to each entry.

With over 20 years of parts and fitment experience, PMB Performance can help compare the required mounting interface with the vehicle build. Share spindle or axle measurements and wheel information before ordering if anything is uncertain.

Manufacturer documentation: Installation instructions.

Manufacturer Warning

Applicable to brake pads only: Wilwood warns of exposure to arsenic, cadmium, hexavalent chromium compounds, lead, nickel, cobalt and antimony trioxide, chemicals known to California to cause cancer or reproductive harm. More information: P65Warnings.ca.gov.