Acura NSX 1991 Manual page 510

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7. Remove the circlip, washer, adjusting spring A, and
the adjusting nut from the piston.
8. Remove the piston seal.
CAUTION: Take care not to damage the cylinder
bore.
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9. Adjust the special tool as shown.
07HAE-SG00100
10. Install the special tool between the caliper body
and spring guide as shown.
11. Compress the adjusting spring B by turning the
shaft of the special tool, then remove the circlip
with snap ring pliers.
07914-SA50000
07HAE-SG00100