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Brake Booster

WARNING: This page is about a different car, the 2019 Subaru Ascent. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Brake Booster Components Location (With Tightening Torque Specification)
G13199723Courtesy of SUBARU OF AMERICA, INC.

Tightening torque: N.m (kgf-m, ft-lb) 

T1: 18 (1.8, 13.3)