Anti-Knockback Springs
A range of anti-knockback springs are available for use with AP Racing calipers.
The spring is located behind the piston in the caliper bore and is designed to counteract pad knock off.
The springs are available in two strengths indicated in lbs, with two sizes for each spring strength dependant upon piston diameter. Refer to the table below for part number details.
| Spring Strength | Piston Diameter | |
|---|---|---|
| Up To Ø34.93mm (1.375") | Above Ø34.93mm (1.375") | |
| 4lb | CP2632-113 | CP2667-105 |
| 7lb | CP4100-121 | CP2667-113 |
| 9lb | CP3432-134 | CP2667-125 |
| 12lb | CP2632-129 | CP2667-154 |
| Note: Springs are available in kits for 4, 7 or 9LB only. | ||
| Anti Knock Back Spring Kits | |
|---|---|
| Part Number | Description and Contents |
| CP6518-4LBLL | Spring kit with 4 x CP2667-105 |
| CP6518-4LBSS | Spring kit with 4 x CP2632-113 |
| CP6518-4LBSSL | Spring kit with 4 x CP2632-113 & 2 CP2667-105 |
| CP6518-4LBSSSS | Spring kit with 8 x CP2632-113 |
| CP6518-7LBLL | Spring kit with 4 x CP2667-113 |
| CP6518-7LBSSL | Spring kit with 4 x CP4100-121 & CP2667-113 |
| CP6518-7LBSSSS | Spring kit with 8 x CP4100-121 |
| CP6518-9LBLL | Spring kit with 4 x CP2667-125 |
| CP6518-9LBSSL | Spring kit with 4 x CP3432-134 & 2 x CP2667-125 |
Download - Anti-knockback spring customer drawing