Abstract: A method of repairing disc brake calipers is disclosed which avoids the necessity and relatively high costs associated with replacement of the caliper housing. The method is particularly adapted for use in repairing calipers in which the piston carries a seal which sealingly engages and is movable along the cylinder sidewall and provides a procedure whereby the cylinder sidewall may be modified to accommodate a seal and the piston may be replaced with a non-seal carrying type piston thereby eliminating the need to provide a substantially perfect cylinder wall surface in order to create a reliable seal.