Bendix Hydro-Boost Brake Booster Cutaway Diagram - Generating Pressure

This document is a labeled cutaway schematic of a Bendix Hydro-Boost hydraulic brake booster unit shown in its pressure-generating (applied) state. The top portion shows a detailed cross-section of the spool valve, identifying Land 1 through Land 4, the reservoir ports (two locations), the pump port, the gear port, and the boost cavity. The main lower illustration is a full cutaway of the Hydro-Boost assembly with callouts for the primary valve, secondary valve, accumulator valve, housing, housing cover, boost cavity, ratio lever, power piston, input rod, and output rod. The nitrogen-gas-charged accumulator is also detailed, with labels for the nitrogen gas chamber, accumulator piston, and accumulator cover. Motion relationships are indicated with dimension arrows: input rod travel "A", travel "A" and travel "B" at the ratio lever/power piston area, and output rod travel "B", illustrating how pedal input travel is translated through the ratio lever to output rod movement. The figure reference number H6262-2A appears in the lower right corner. A reader can learn the internal component layout of the Hydro-Boost unit, the hydraulic porting of its spool valve during pressure generation, and how input and output rod travel relate through the ratio lever. It was uploaded as part of a multi-page Hydro-Boost reference set for a 1991 Ford Bronco.