What does this diagram show?

A labeled cutaway of a Bendix Hydro-Boost unit generating pressure, including the spool valve lands, boost cavity, accumulator, ratio lever, power piston, and input/output rods.

What are the labeled parts of the Hydro-Boost spool valve?

The spool valve cutaway shows Land 1, Land 2, Land 3, and Land 4, with reservoir ports, a pump port, a gear port, and the boost cavity.

What charges the Hydro-Boost accumulator?

The diagram labels nitrogen gas inside the accumulator, along with the accumulator piston and accumulator cover.

How is input rod motion related to output rod motion?

The diagram shows input rod travel "A" acting through a ratio lever on the power piston, producing output rod travel "B", with travel "A" and travel "B" dimensions marked at the lever.

What valves are inside the Hydro-Boost unit?

The diagram labels a primary valve, a secondary valve, and an accumulator valve.

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Bendix Hydro-Boost Brake Booster Cutaway Diagram - Generating Pressure

Bendix Hydro-Boost unit generating pressure cutaway schematic with labeled lands and valves

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Cutaway schematic of a Bendix Hydro-Boost unit generating pressure, labeling reservoir lands, valves, accumulator, and travel dimensions.

AI caption March 2006 · Photo 389 of 1818

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.

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Frequently asked questions

What does this diagram show?: A labeled cutaway of a Bendix Hydro-Boost unit generating pressure, including the spool valve lands, boost cavity, accumulator, ratio lever, power piston, and input/output rods.
What are the labeled parts of the Hydro-Boost spool valve?: The spool valve cutaway shows Land 1, Land 2, Land 3, and Land 4, with reservoir ports, a pump port, a gear port, and the boost cavity.
What charges the Hydro-Boost accumulator?: The diagram labels nitrogen gas inside the accumulator, along with the accumulator piston and accumulator cover.
How is input rod motion related to output rod motion?: The diagram shows input rod travel "A" acting through a ratio lever on the power piston, producing output rod travel "B", with travel "A" and travel "B" dimensions marked at the lever.
What valves are inside the Hydro-Boost unit?: The diagram labels a primary valve, a secondary valve, and an accumulator valve.