Mounting pad compression unit for disk brake, has central portion of cap sliding in groove from rear position to front position using ventilating unit forming event, where groove and portion are not-tightly cooperated in front position

摘要

The compression unit (1) has a mobile piston cooperating with a fixed or stirrup frame (5) comprising a tubular portion with a lateral wall (52), and a cap (6) forming a sealed partition. A central portion (60) of the cap slides in an annular groove (42) from a rear position to a front position using a ventilating unit (12) forming an event (12'). The groove and the central portion are tightly cooperated in the rear position, and the groove and the central portion are not-tightly cooperated in the front position.