Removal & Installation

Disconnect fluid level sensor electrical connector at fluid reservoir. See Fig 1. Disconnect and plug brake lines at master cylinder to prevent entry of dirt and loss of fluid. Remove nuts attaching master cylinder to power brake unit. Remove connector, bolt and washers. Remove proportioning bypass valve (PBV) and "O" ring. Remove master cylinder from vehicle. To install master cylinder, reverse removal procedure. Bleed air from system.

Fig 1: Exploded View Of Master Cylinder Assembly (MPV Shown; Other Models Are Similar)

Courtesy of MAZDA MOTORS CORP.