Re: 05 Tundra with rear brake noise

[email]Dad-x-2@webtv.net[/email] sez:
[color=blue]
> I have a 05 DC with 19k miles and ever since the truck has had around 8k
> miles the rear brakes emit a loud moaning sound when you go to stop and
> get down to about 4 mph or slower. Two dealers have checked and cleaned
> the dust off and one replaced rear drums and they still do it badly. It
> is loud enough that other drivers will turn and look at you. Would some
> different shoes help this like high performance. Had them checked again
> yesterday and was told they still looked great and the noise was normal.
> BS, I have never owned a vehicle that made that much brake noise.
> Suggestions?[/color]

Hmmmmm, interesting. My '04 DC has started doing the same this winter
(I have about 25k miles on it). I'm running studded snows that have
relatively aggressive tread patterns (noisy) and was wondering if they
were inducing some low speed vibration that set things off. Are you
still on the OEM tires?

I pulled the drums and blew all of the dust out with the compressor
which helped for a while but its back. I made sure to check for
hydraulic slave cylinder and/or axle seal leaks at the time but it all
was nice and dry. It seems to be affected by moisture as it doesn't do
it when things are wet from snow melt and such. I'm curious on why it
has started now with my driving patterns/habits unchanged since I've had
it for over two years now. Normal? Baloney, it didn't do it before. I
can mitigate the symptoms by braking with more pressure in coming to a
stop but that bugs me.

The next thing I'm going to do is pull the drums again, inspect the wear
surfaces and make sure the automatic adjusters are doing the right thing
(for grins, I may try swapping the drums too just to change the braking
directional forces on them).

The other thing I suspect may be in play is the load sensing &
proportioning valve. I installed air bags on the rear over a year ago
and usually run them at the minimum recommended 10psi when unloaded so
ride height isn't affected. I think I'll try pressuring up to 50 psi to
get the back end up higher. That should lower the pressure to the rear
drums through the proportioning valve on braking so it'll be interesting
to see if it changes anything.

I'll keep ya posted on what works or doesn't work ...

Good diagnosin' to ya,
VLJ
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