Bendix Hydro-Boost Reserve Operation Diagram - Accumulator Valve Schematic

This document is a cross-sectional schematic illustrating the reserve (accumulator) operation of a Bendix Hydro-Boost hydraulic brake booster. The diagram shows the internal cutaway of the booster unit with the input lever/linkage on the right side. Labeled callouts identify the accumulator charging check valve on the upper left of the housing, the lever travel dimension near the input lever, and the boost cavity within the unit. A key callout explains the reserve function: as the lever travels, the accumulator valve is contacted, releasing stored fluid pressure to the boost cavity — this is how the Hydro-Boost provides reserve brake assist when normal power steering pump pressure is unavailable (e.g., engine off or pump failure). The lower portion of the scan is obscured by a gray block, so any caption text there is unreadable. The document appears to be one page of a multi-page Hydro-Boost reference set uploaded to a 1991 Ford Bronco gallery; the diagram itself does not state any specific vehicle year, make, or model, only the Bendix Hydro-Boost system. Readers can learn the location of the accumulator charging check valve and understand mechanically how pedal (lever) travel triggers the accumulator valve to deliver reserve boost pressure.