Wilwood left GN6R type iii anodized caliper, 1.38-inch rotor width, 1.75/1.38/1.38-inch bores: angled logo side and open pad channel

Wilwood Grand National GN6R Brake Caliper, Left / Type III Anodized / 1.25–1.38-Inch Rotor Width

SKU: 120-13947

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Fitment questions?

Call (855) 786-7101 or text (801) 304-3141. We check fitment by VIN.

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Product details

A 6-piston Wilwood Grand National GN6R for left-hand installation, this Type III anodized caliper works around a nominally 1.38-inch-wide rotor. Its 1.75/1.38/1.38-inch bore configuration and 7.09-inch radial centers are the principal dimensions to compare. Bill Wood founded Wilwood Engineering in 1977. Based in Camarillo, California, Wilwood designs and manufactures disc brake systems and parts for motorsport, street-performance and specialized applications, from calipers and rotors to master cylinders, valves, fittings and brake lines.

The six-piston GN6R uses radial attachment, a removable center bridge and type 7520 pads. Matching bracket kits adapt the caliper to earlier Grand National mounting layouts; the 7.09-inch radial centers are not the bracket-to-spindle spacing.

Technical Details

  • Manufacturer part number: 120-13947
  • Component: Wilwood Grand National GN6R; one caliper
  • Piston arrangement: 6 pistons; 1.75/1.38/1.38-inch bores; stainless steel
  • Hydraulic piston area: 5.40 square inches, as specified by Wilwood
  • Pad shape: Wilwood type 7520; compound selected separately
  • Mounting: Left hand; Radial; 7.09-inch centers; 0.45-inch mounting holes
  • Mount height: 2.33 inches
  • Rotor width: 1.38-inch nominal; 1.25–1.38-inch permitted range
  • Rotor diameter range: 12.19–13.06 inches
  • Fluid inlet: 1/8-27 NPT
  • Dust boots: No
  • Body and finish: Forged aluminum; Type III anodized

Fitment & Compatibility

Confirm rotor diameter as well as thickness, and allow for pad and caliper clearance inside the wheel. The mount pattern is a dimensional requirement rather than a vehicle fitment guarantee.

This listing covers one caliper. Match the brake pads, rotor, hose and mounting arrangement to the complete brake system.

For a brake system assembled from individual components, PMB Performance brings over 20 years of experience. Contact us with the rotor, caliper and bracket information so we can help check the combination.