Re: [DML] Re: Odd chatter from brakes *update*

["Payne" <bpayne@xxxxxxxxxx>]

> If the noise is deceleration noise as Dave T suggests I would also
> expect it to occur when you rev the motor. When you run the motor up
> to 3-4,000 RPM and let off the gas you would hear the noise.

I can rev the engine and it sounds very smooth, I can't hear any knocking or
crackling noise. I revved it to about 4,500 RPM a couple times, even trying
to let it down slowly to simulate deceleration and it all sounded good. It
doesn't seem to be a problem with the engine or induction. It makes the
noise even when I'm coasting at idle and the brakes are applied.

> I'm focused on drive line because the deceleration valves sticking
> are very rare.

I will look into this further, but the motor mounts are okay and I don't
hear any strange noise moving it back and forth in the driveway.

> Another thing occurred to me. I once had the muffler brace above the
> alternator break. The broken piece was still on the muffler mount
> and because of the rust, etc. on the brace, the broken piece would
> move but only with some force. When I slowed the car it would move
> forward and hit the alternator fan blades and cause all kinds of
> racket.

I've been looking into this possibility as well. I even removed the heat
shield completely and I still get the same noise. The muffler seems to be in
there firmly. Unless it's the muffler itself? Although this doesn't make
sense as it should make noise with the engine revving and not just when I
apply the brakes.

The blades of the alternator striking metal would probably create a similar
noise, but nothing is in their path. I was thinking maybe something inside
the alternator, but that would make the noise all the time and not just when
I brake. With the fact that it will not make the noise if I brake when the
engine is shut off, I think I can just about rule out a problem with the
brakes. All I know is that the engine has to be running. Yet what could
possibly make a noise that gets worse the harder I push the pedal? If I
brake very gently it will not happen.

I'm about out of ideas here, and I appreciate all the suggestions. Even if
it's a remote possibility, let me know of other ideas and I'll check it to
be sure. Thank you all so much for your help! I'm going to try and not think
about it until tomorrow, as it's only fueling my intense frustration.

Brandon Payne


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