Brake booster non-return valve

[JonM]

Has anyone ever had the non return valve 34331160183 ever fail? It’s part of the vacuum line to the brake booster. I haven’t seen or read about anyone having an issue with this part so I think it’s a long shot.

[rf900rkw]

Not on a Z3 or E36, no. What symptoms are you chasing?

[bluptgm3]

Soft pedal on an “M” is most likely a NLA “Bomb” or brake booster.
Folks are current having them (TRW brand - now a division of ATE) shipped from Europe, specifically France.


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[JonM]

Not on a Z3 or E36, no. What symptoms are you chasing?

Pedal makes hissing sound for first 5 or 6 presses, then normal. All braking performance normal. All pedal feel normal. Nice fresh bleed and all new fluid. Maybe the booster is on the way out but I’m not convinced yet.

- - - Updated - - -

Soft pedal on an “M” is most likely a NLA “Bomb” or brake booster.
Folks are current having them (TRW brand - now a division of ATE) shipped from Europe, specifically France.


Sent from my iPhone using Tapatalk

Pedal feel is normal. Just hissing sound on the first few presses.

[rf900rkw]

It's normal for the booster to hissas the pedal moves. If there is a hissing when holding steady pressure on the brake pedal, the booster has a leak.