Wilwood 120-17770-RD Forged Dynalite-M 4-Piston Disc Brake Caliper Red

The Wilwood Forged Dynalite-M (120-17770-RD) is an advanced evolution of the legendary Forged Dynalite caliper series, engineered specifically to enhance outboard clearance and serve as the foundation for Wilwood's Classic Style brake kits. Built using stress-flow forging technology, this caliper delivers class-leading strength, reduced deflection, and improved braking performance in a lightweight package starting at just 2.80 lbs.

Stress-Flow Forging Technology:

• Stress-flow forging re-aligns the metal's internal grain structure to match the contour of the caliper body — eliminating the grain interruptions caused by machining from a straight billet block
• FEA-generated radial transition design removes steps and shoulders between the piston housing and caliper bridges, dramatically increasing resistance to deflection and caliper separation under load
• Structural deflection and volume displacement testing confirms superior performance over all comparable calipers in this size class
• Reduced deflection and lower fluid volume displacement translate directly to increased clamping efficiency and less pedal travel — the result is a taller pedal and stronger stopping power

SRS Stainless Steel Bridge Plates:

• Wilwood's proprietary SRS bridge plates protect against bridge wear caused by pad gouging, extending caliper service life
• Spring-loaded action eliminates pad rattle and dampens vibration harmonics that cause brake squeal

Key Features:

• High-temperature seals and stainless steel pistons resist corrosion and limit heat transfer from brake pads
• Internal fluid passages — no external tubes required
• Four-corner bleed screws for thorough air evacuation; caliper can be mounted in any position (front, rear, left, or right)
• Bright red anodized finish resists corrosion and delivers a bold, high-performance look
• Compatible with Wilwood's 7112-type brake pads, shared across the Dynalite caliper family
• Direct replacement for all Wilwood Dynalite and compatible competitive-brand calipers with 5.25" centered mounting lugs

The Wilwood 120-17770-RD Forged Dynalite-M caliper combines proven Wilwood engineering with next-generation forging and FEA design to deliver a high-performance braking solution for racing and performance street applications.