SOLUTION FOUND! - Pedal Buzz

[Mike W.]

Good lord, does that make me more of a word nerd than Shawn D.?

No, trust me, it does not. Besides ShawnD is words and grammar.

[Shawn D.]

Really... I'm puzzled as to why that would make a difference; the hose is still flexible. I sure wouldn't expect an item like that to transmit vibration very well because braided SS hoses are used in a lot of industrial plumbing applications to dampen vibrations.

Braided SS hoses certainly aren't used to wet vibrations.

I think you're confusing the difference between the damping provided by a rubber hose vs. a braided SS hose with the damping provided by any hose vs. a hard line. The SS lines would be used for durability/pressure capacity, not increased damping over a rubber hose.

In any case, the difference in flexibility and mass of the SS hose would change the harmonics of the system, which in this case brought it into a resonant condition.

So I guess BMW calls this a damper because it keeps the front of the engine moist?

You need to up your reading game. It's in line with what I said: a damper. BMW doesn't call it a dampener.

dampen
[dam-puh n]
verb (used with object)

1. to make damp; moisten: to dampen a sponge.
2. to dull or deaden.

Definitions from a non-technical source about a technical subject are irrelevant.

BTW, what's the name of the flap thing that you use to change air flow of HVAC vents? Is it a dampener? No, it's a damper.

[tig]

Verified no buzz on Vlad after replacing stainless hose with a rubber hose.

Braided stainless clutch slave lines are evil and a waste of money. I have two for sale, cheap.

[LarryM]

I recently had a manual swap done on my E24, and as an "upgrade" I decided at the last minute to use a SS braided line. I have the same buzzing sound. Actually, I'm relieved to find out that's all it is; I was rather suspecting something was amiss in the tranny. At least I already have a new OE type hose ready to go in next time I have the car up in the air.

[davintosh]

Definitions from a non-technical source about a technical subject are irrelevant.

Well, I dunno; I got that definition from some fancy online dictionary, so its operated on the intarwebs and uses recycled electrons and everything. What more do you want?

[LarryM]

So I removed my aftermarket braided line and replaced it with an OE-type rubber hose. No more buzz in the pedal bracket.

Thanks, cek for discovering the cause of this annoying noise! I don't think I would have ever thought of it. The metal-to-metal connection transmitting the gear whine makes perfect sense though.