I believe your V12 is really two M104 engines joined at the hip.

I think you have an accumulator, but not a check valve. I do know that M103's have a check valve.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".