Wilwood 140-15302-D FNSL6R Front Big Brake Kit 1963-1987 Chevy GMC C10/C15 4x2

Vehicle Fitment

• 1963-1970 Chevrolet C10 / C15 Pickup (4x2, Wilwood Modular Pro Drop Spindle 831-14201 Required)
• 1971-1987 Chevrolet C10 / C15 Pickup (4x2, Wilwood Modular Pro Drop Spindle 831-14202 Required)
• 1963-1970 GMC C10 / C15 Pickup (4x2, Wilwood Modular Pro Drop Spindle 831-14201 Required)
• 1971-1987 GMC C10 / C15 Pickup (4x2, Wilwood Modular Pro Drop Spindle 831-14202 Required)

Fitment Notes

• This kit requires Wilwood C10 Aluminum Modular Pro Drop Spindles to fit. It will NOT fit original equipment (OE) spindles - spindles must be purchased separately.
• For 1963-1970 applications: use Wilwood ProSpindle 831-14201. For 1971-1987 applications: use Wilwood ProSpindle 831-14202.
• Hub offset vs. stock OE brakes: +0.41" outboard for 1963-1970 models; -0.06" inboard for 1971-1987 models. Verify fender clearance before installation.
• 4x2 (two-wheel drive) models only.
• Bolt Circle: 5 x 4.75" and 5 x 5.00" (dual bolt circle rotor hat).
• Minimum wheel diameter required: 15". Refer to Wilwood's wheel clearance diagram (DS1158) before purchase.
• Braided stainless flex lines are not included. Required line kits vary by year and vehicle: 220-7056, 220-11237, or 220-12168 - sold separately.
• Kit may fit additional vehicles - contact Wilwood Sales/Tech Support at (805) 388-1188 to confirm.

Features

• Forged Narrow Superlite 6R (FNSL6R) six-piston radial mount calipers provide high clamping force engineered to be compatible with OE master cylinder output and ABS function.
• 12.19" SRP Drilled and Slotted two-piece vented rotors with 32 straight vanes deliver reliable heat dissipation and improved bite for performance street and show builds.
• Dynamically balanced rotors reduce vibration and ensure smooth braking at all speeds.
• Aluminum Drag Hat with shallow offset (1.530") and dual bolt circle (5x4.75" / 5x5.00") accommodates a wide range of custom wheels inside the stock wheelwell.
• Radial mount caliper design ensures precise pad-to-rotor alignment and consistent brake bias.
• Black powder coat caliper finish provides corrosion resistance suited to daily driver, show, and restomod builds.
• Stainless steel pistons resist heat and corrosion for long-term durability and low maintenance.
• BP-10 high-friction brake pads deliver balanced stopping performance for street and light performance driving.

Specifications

• Position: Front (Left and Right)
• Caliper Type: Forged Narrow Superlite 6R (FNSL6R) - Radial Mount
• Caliper Finish: Black Powder Coat
• Caliper Part Numbers: LH 120-14540-BK / RH 120-14539-BK
• Piston Count: 6 per caliper | Piston Bores: 1.75" / 1.25" / 1.25" (stainless steel)
• Piston Area: 4.86 in²
• Brake Pad Plate: 7416 | Compound: BP-10 | Pad Area: 8.2 in² | Pad Volume: 3.8 in³
• Rotor Diameter: 12.19" | Rotor Width: 1.10"
• Rotor Style: SRP Drilled & Slotted | Vented | 32 Straight Vanes | Dynamically Balanced
• Rotor Material: Iron with Black Electro Coat
• Rotor Part Numbers: LH 160-12205-BK / RH 160-12204-BK
• Rotor Hat: Drag Hat Shallow Offset - Aluminum, Black E-Coat (170-14206) | Hat Offset: 1.530" | Bolt Circle: 5 x 4.75" / 5 x 5.00" | Stud Diameter: 0.520"
• Spindle Type: Wilwood Modular Pro Drop Spindle (required, sold separately)
• Hub Offset vs. OE: +0.41" outboard (1963-1970) | -0.06" inboard (1971-1987)
• Minimum Wheel Diameter: 15"
• Brake Lines: Not Included - requires 220-7056, 220-11237, or 220-12168 (sold separately)
• UPC: 889545077544

Included Components

• 1x LH FNSL6R Caliper - Black Powder Coat (120-14540-BK)
• 1x RH FNSL6R Caliper - Black Powder Coat (120-14539-BK)
• 2x SRP Drilled & Slotted 12.19" Vented Rotors - Black Electro Coat, Dynamically Balanced (LH: 160-12205-BK / RH: 160-12204-BK)
• 2x Drag Hat Shallow Offset - Aluminum, Black E-Coat (170-14206)
• 1x Set 7416 BP-10 Brake Pads
• 1x Hat Bolt Kit (230-12177)
• All required caliper mounting hardware

Product Description

The Wilwood 140-15302-D Forged Narrow Superlite 6R Big Brake Front Brake Kit is engineered specifically for 1963-1987 Chevrolet and GMC C10/C15 half-ton pickup trucks running Wilwood's Modular Pro Drop Spindles (sold separately). FNSL6R six-piston forged billet aluminum calipers clamp over 12.19" SRP Drilled and Slotted dynamically balanced rotors for a significant big brake upgrade that is matched to OE master cylinder output and compatible with ABS systems where equipped. The aluminum drag hat with dual bolt circle (5x4.75" / 5x5.00") provides broad wheel compatibility inside the stock wheelwell.

This kit will not fit OE factory spindles - Wilwood Modular Pro Drop Spindle 831-14201 is required for 1963-1970 trucks, and 831-14202 is required for 1971-1987 trucks; both are sold separately. Hub offset vs. stock OE brakes is +0.41" outboard for 1963-1970 builds and -0.06" inboard for 1971-1987 builds - verify fender clearance for your specific year before purchase. Braided stainless flex lines are not included; the correct Wilwood line kit (220-7056, 220-11237, or 220-12168 depending on application) must be purchased separately. Minimum wheel diameter is 15"; always confirm fitment using Wilwood's DS1158 wheel clearance diagram.