Caliper Piston Knock Back Springs. Used in low brake pedal situations due to piston knock back caused by vibration, mount or spindle flex. Part # 300-2434 (1.22 in. diameter) is used with Wilwood’s conventional stainless steel pistons from 1.62 in. to 1.88 in. diameter. Spring use in stainless pistons require a relief cut not present in earlier versions of pistons. Please check your application before ordering.

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