Importance

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Abstract

An expansion reservoir is disclosed, which has a fluid chamber defined by a reservoir bottom and a flexible reservoir top movable relative to the reservoir bottom as a function of the reservoir filling level, wherein a hydraulic connection to a master cylinder is provided at the reservoir bottom while the reservoir top comprises a substantially liquid-tight but air-permeable connection to the atmosphere, in order to allow pressure compensation between an air volume left in the filled fluid chamber and the atmosphere. The hydraulic connection to the master cylinder comprises an extension protruding into the fluid chamber, which extension defines a predetermined volume V in the fluid chamber which is larger than the air volume left in the filled fluid chamber. In addition thereto, the reservoir top may take the form of a rolling lobe bellows, which comprises a plurality of wall portions substantially concentric at least in the undeformed state.

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First Claim