BENDIX Hydro-Boost ("F" Series Super Duty)

WARNING: Hydro-boost unit should not be carried by accumulator. DO NOT drop hydro-boost on accumulator. Snap ring should be checked for proper seating before booster is used. Accumulator contains high pressure nitrogen gas and can be dangerous if mishandled. Before disposing of boosters, drill a 1/16" (1.6mm) hole in end of accumulator can to relieve gas pressure.

The "F" Series Super Duty hydro-boost is hydraulically operated by the power steering pump and provides a variable power assist regulated by brake pedal pressure.

Hydro-boost has a reserve system (compressed gas accumulator) which stores enough fluid under pressure to provide at least 2 power assisted brake applications if power steering pump fluid flow stops. Brakes can also be operated manually if reserve system is lost.

Hydro-boost power units in normal condition produce certain noises. These noises occur when brakes are used more than usual. In general, these noises are hissing, clunks, clicks and chattering. Hydro-boost hisses when greater than normal braking effort is used. Hissing increases when pedal effort and operating temperatures increase. Loud hissing at normal pedal effort of 25-35 lbs. (11-16 kg.) or less should be investigated. Clunk, chatter and clicking noises are heard when brake pedal is quickly released from hard braking.