Fluid accumulator for use in a vehicle anti-lock brake system

A fluid accumulator comprising:

• an accumulator body having an inner surface defining an axial bore extending from an open end of said accumulator body to a closed end of said accumulator body;
• a generally cup-shaped cylindrical piston having an inner surface defining an axial bore extending from an open end of said piston to a closed end of said piston, said piston being slidably received within said axial bore of said accumulator body;
• a cap having a generally cylindrical body portion having an inner surface defining an axial passageway through said body portion, said cap further having a circumferential, radially outwardly extending flange formed on one end of said body portion, said cap being mounted in said bore of said accumulator body to retain said piston in said bore of said accumulator body;
• a spring disposed between said cap and said piston, said spring urging said piston relatively away from said cap and toward said closed end of said accumulator body;
• and
• a grommet having a shaft and an enlarged annular head formed on a first end of said shaft, said shaft being disposed to seal against said inner surface of said cap, said grommet having an inner surface defining an axial bore extending from said head through an open end of said shaft at said first end of said shaft to a closed end of said shaft at a second end of said shaft, said closed end of said shaft having a closable passageway therethrough.