Wilwood 120-8729-BK Powerlite 4-Piston Radial Mount Disc Brake Caliper Black Anodized

The Wilwood Powerlite 120-8729-BK is a high-performance four-piston radial mount disc brake caliper finished in black anodize. Weighing in at just 2.26 pounds, this caliper delivers an exceptional strength-to-weight ratio, making it a top choice for sports, rally, and off-road driving applications that demand reliable stopping power in high-temperature environments.

Stress-Flow Forged Construction

Wilwood builds the Powerlite using a stress-flow forging process that re-aligns the metal's grain structure to follow the contour of the caliper body. Unlike machining from a straight billet block—which interrupts the grain structure—this forging method preserves material integrity throughout. Combined with an FEA-optimized radial transition design that eliminates steps and shoulders between the piston housing and caliper bridges, the result is a caliper with significantly greater resistance to deflection and separation under hard braking loads.

7912 Brake Pad System with Quick-Clip Retainers

The Powerlite uses Wilwood's 7912-type brake pad, retained from the top via Quick-Clip pad retainers. This design removes the need for a pad support step at the base of the caliper, allowing the unit to mount closer to the hub—ideal for compact wheel and rotor setups. The pad radius is matched to rotor diameters between 9.45" (240 mm) and 11.75" (298.5 mm), and the caliper fits inside many 13.00" (330 mm) wheel applications. Quick-Clips also allow pad removal and inspection without dismounting the caliper. Brake pad compounds are available across the full spectrum of street, sport, and competition use.

SRS Stainless Steel Bridge Plates

Every Powerlite caliper ships with Wilwood's SRS (Spring-Loaded Retention System) stainless steel bridge plates. These plates protect against pad gouging at the bridge, while the spring-loading action eliminates pad rattle and dampens vibration harmonics that contribute to brake squeal. Internal fluid passages remove the need for external brake lines or tubes, keeping the installation clean and compact.

Flexible Mounting & Bleed Configuration

Four corner bleed screws allow complete air evacuation and enable the caliper to be mounted in any of four orientations. Radial mounting via available bracket kits allows this caliper to replace most lug-mount calipers, with two planes of adjustment for precise rotor alignment. Bracket kits (sold separately) include the radial mount bracket, studs, locknuts, and caliper alignment shims.

Key Features:

• Four-piston radial mount caliper — starting weight of 2.26 lbs
• Black anodized finish (MPN suffix: -BK)
• Piston diameter: 1.38"
• Compatible rotor thickness: 0.790" / 0.860"
• Compatible rotor diameter range: 9.45" – 11.75"
• Fits inside many 13.00" wheel applications
• Uses Wilwood 7912-type brake pads with Quick-Clip top-mount retainers
• Stress-flow forged aluminum body for superior grain structure
• FEA-optimized radial bridge transition design
• SRS stainless steel bridge plates — reduces wear, rattle, and squeal
• Internal fluid passages — no external brake lines required
• Four corner bleed screws — four mounting position options
• Radial mounting compatible with bracket kits for lug-mount caliper replacement

The Wilwood Powerlite 120-8729-BK is engineered for builders and racers who need a proven, lightweight radial-mount caliper with race-derived technology adapted for a broad range of performance applications.