After the accumulator has been emptied and the engine is started again, another hissing sound might be heard during the first brake application or the first steering maneuver. This sound is caused by the fluid rushing through the accumulator charging orifice. It is normal and will only be heard once after the accumulator is emptied. However, if this sound continues even though no
apparent accumulator pressure assist was made, it could indicate that the accumulator is not holding pressure. Check for this possibility using the accumulator test discussed previously.