Help with '01 rear brakes

[johnfin]

I am having a problem with my rear drums, I have replaced all of the components, drums, shoes, springs , wheel cylinders too (leaking) , and they make a swish swish (eccentric sounding). I bought factory shoes because they are the only ones that come tapered on the ends to allow for the arcing. They started off perfectly quiet then a week later they are noisy. Took them to pepboys and they sanded(ouch) the outer edges of the shoes. A little better but not quiet. Any ideas?

[BendixAnswerMan]

There are just a few things that could be checked out. Be sure the drums you purchased fit close around the center hole. If not, runout could be an issue. If the drums make a rhythmic brush sound as you rotate and that is your noise, a little might be okay, but a lot could also indicate some runout in the rotor friction surface. It isn't super common with new parts but it can happen on those rare occasions. With drums getting smaller on today's cars there can be issues with metal contamination in the friction lining. Washing the drums and rotors with hot soapy water and a stiff non-metallic brush before installing can help keep the fine machining particles out of the lining. These particles can cause some noise as they will embed themselves in the surface of the shoes.
Be sure there are no grooves in the backing plate shoe support pads. These can cause the shoes to grab and contribute to noise issues. If grooves are there then it's suggested the backing plate be replaced. You mentioned you replaced the springs. Be sure that not only the return springs were replaced but it's a good idea to use new hold-down springs also.

[johnfin]

I replaced all springs including the hold downs. We are on the same thinking path, I also believe its a concentricity issue with the chinese drums. I wonder if when the shops turn the drums if they use the center hole for mounting them. Even so, of its too large of a hole that could be a problem. One clue is that the noise is greater on lower speeds, hardly pressing the pedal. Hard braking is not as noisy. Harder pressure could align or float the shoe into place taking up the ecentric problem, right?

[SiennaDriver]

Probably a different issue, but when our 2000 was new the rear brakes squealed no end. It was posted somewhere to attach the super strong type of magnet (forget what they're called) to the back of the back plate and that fixed the issue. Just reached up and stuck them on, cured the resonating sound to this day.

JIC it's connected to your issue, disregard if not.

[wiswind]

I had a bad set of rear brake drums for my Windstar that I got at NAPA.
Caused the car to shake at 45mph and higher.
I tried rotating the tires, having the tires spin ballanced, checking over the brake job.
Finally, I put my old drums back on.....and the problem was soved.
So I took the NAPA drums back and got another brand someplace else.

If you have the old original ribbed (outside) drums......there was a TSB that Toyota came out with a different drum to eliminate the resonance that could develop and cause a low pitch squeal.
I bought the "improved" drums from Toyota ($$$) and they are non-ribbed......smooth around the outside of the drum.
I noticed that all the aftermarket drums that I looked up were non-ribbed, so I am thinking that the aftermarket drums should be fine.
It is possible that you got a bad set of drums.....
You did not get "semi-metalic" lined shoes did you?....as semi-metalic lining (drum brakes or disk brakes) can squeal.

[johnfin]

I tried different drums and the sound (swish swish swish) is still there on soft braking. Some pics when I replaced the drums.