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#1
11-15-2012, 07:09 AM
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Excessive Dust on Rear Brakes - 99 Suburban
So my saga continues with my rear brakes on my 99 Suburban - had a glazing problem that was eventually discovered, glaze knocked off old pads and then glaze came back again. So we replaced the rear drums and pads. A month and a half later I get an irritating squeaking noise.
Noise - when the tires are rotating they make a light squeaking noise, a rotating/pulsing squeak; when the brakes are applied they make a lower pitch squeak and if I apply just the right pressure on the brakes I can get the noise to go away (while also giving it gas to keep moving). Last night I inspected the rear brakes and found an excessive amount of dust/grime on the pads. The drums we fairly clean. The pads had a heavy layer of rust/grime on them. When I ran my finger over them it left no mark on the pad because it was so heavy, but my finger had this sooty grime on it. The rust covered about a 1/3 to 1/2 of the pads (each pad had a different amount of coverage). Everything is brand new and I'm not sure what is causing all the dust coverage. Any ideas? 
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#2
11-15-2012, 08:27 AM
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Re: Excessive Dust on Rear Brakes - 99 Suburban
A certain amount of brake dust is normal with the loss of friction material from the shoes. My guess is the the noise and "excessive" dust is being caused by poor quality brake shoes. I would recomend Delco brake shoes as they meet GM specifications. If the drums are grooved or glazed up I would also recomend having them resurfaced.
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#3
11-15-2012, 08:33 AM
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Re: Excessive Dust on Rear Brakes - 99 Suburban
when replacing the shoes and drums you must adjust the emergency brake cable so that it has slack in it. if not the rear shoes will drag.
after driving about a mile feel the brake rotors drums. they should all be warm not hot. if the rear is hot and the front is not then this is a good indication of dragging brakes.
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#4
11-15-2012, 08:34 AM
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Re: Excessive Dust on Rear Brakes - 99 Suburban
Thanks. I put on Wagner shoes. There is no glazing or grooves in the drums, just the dust on the shoes.
After driving for about 20 minutes (city driving) I was able to remove the drums with no problem. They were warm, but not hot at all. I will adjust the cable so it has slack in it. Thanks
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