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Message: <blockquote data-quote="leforte" data-source="post: 116562" data-attributes="member: 1943">its called a one way check valve. your brakes function with the aid of vacumm pressure from your engine via the inlet manifold. the part you were enquiring, provides a one way air circulation from your brake master pump towards your inlet manifold, stoping any reverse flow of air. partial failure of this part will give you symptoms like a spongy brake pedal under hard braking.  ever tried stepping on your brakes without starting the engine (no vacumm pressure? the feeling would be the same should this part fails entirely. failure could be due to a clog up of the passage within the valve, air leaks upstream etc etc ect.... cheers</blockquote>