Wilwood 300-17297 Caliper Piston Knock Back Spring Disc Brake Hardware Kit

The Wilwood 300-17297 Disc Brake Hardware Kit provides caliper piston knock back springs designed to solve low brake pedal issues caused by piston knock back from vibration, mount flex, or spindle deflection.

Key Features:

• 0.72-inch diameter spring design
• Compatible with all sizes of Wilwood Thermlock pistons
• Works with Wilwood conventional stainless steel pistons ranging from 1.00-inch to 1.50-inch diameter
• Prevents piston retraction under racing or high-performance conditions
• Maintains consistent brake pedal feel and travel

Important Application Notes:

• Use with stainless steel pistons requires an updated relief cut not present in earlier piston versions
• Verify piston compatibility before ordering to ensure proper fitment

These knock back springs are essential components for racers and performance enthusiasts experiencing inconsistent brake pedal height due to chassis flex or rough track conditions. By maintaining constant piston-to-rotor clearance, these springs help eliminate the need for excessive pedal travel on initial brake application.