Does the M42 have a Brake Booster Check Valve?

[AmosCake]

Part number for that piece, doesn't seem to be in realoem. I believe its a check valve/pressure valve?

[av8drvr]

If I recall you need to search the M20 part 34331156703.

[av8drvr]

Looks like Bimmerworld has it for $37. New part# 34331156579

[AmosCake]

Looks like Bimmerworld has it for $37. New part# 34331156579

I may be dumb but they look nothing a like. IS that one piece non existent? So that part number you sent does the same thing?

[av8drvr]

Yes. I had to replace mine a few years back and that M20 part works just fine.

[AmosCake]

Yes. I had to replace mine a few years back and that M20 part works just fine.

What was the sign that made you replace it? Whenever I press my brakes, it makes like an airy sound as if blowing air out. Brakes just fine though

[av8drvr]

Mine had actually come apart. Oddly my brakes worked just fine, I was poking around the fuse box and noticed the original valve was split in half.

[AmosCake]

Mine had actually come apart. Oddly my brakes worked just fine, I was poking around the fuse box and noticed the original valve was split in half.

I see, thanks for the insights. I appreciate it