Wilwood right GN6R type iii anodized caliper, 1.38-inch rotor width, 1.75/1.38/1.38-inch bores; Thermlock piston specification: angled logo side and open pad channel

Wilwood Right GN6R Thermlock Caliper, 1.38-Inch-wide Rotor, Type III Anodized 6-Piston Body

SKU: 120-13948

$788.33 Sale
Shipping calculated at checkout.

Fitment questions?

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

Shipping policyRefund policy

Product details

This Wilwood Grand National GN6R is a right-hand 6-piston brake caliper with a Type III anodized finish for a nominally 1.38-inch-wide rotor. Its 7.09-inch radial mounting centers and 1.75/1.38/1.38-inch piston bores must match the brake assembly. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company makes disc brake systems and components, including calipers, rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized applications.

Technical Details

  • Manufacturer part number: 120-13948
  • Mounting: Right 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
  • Pad shape: Wilwood type 7520; compound selected separately
  • Piston arrangement: 6 pistons; 1.75/1.38/1.38-inch bores; Thermlock
  • Hydraulic piston area: 5.40 square inches, as specified by Wilwood
  • Body and finish: Forged aluminum; Type III anodized
  • Fluid inlet: 1/8-27 NPT
  • Dust boots: No
  • Component: Wilwood Grand National GN6R; one caliper

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.

Fitment & Compatibility

For a replacement, compare the entire caliper specification rather than the finish or logo. On an adapted system, establish rotor alignment and piston-area requirements before choosing the mounting bracket.

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

Ask PMB Performance for help comparing this caliper with your existing assembly. Our over 20 years of experience are most useful when you provide rotor size, mounting details and the current piston configuration.