Throbbing and Squealing! Make it stop! - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-30-2006, 05:38 PM
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Throbbing and Squealing! Make it stop!

I'm fairly new here, but ive already found out that you guys have some excellent solutions, so i hope you can help me! Ive got a 1970 buick skylark, 350, four-wheel drums, and its almost completely stock. My brakes went out about 4 months ago, so i went to BrakeMasters to see if they could fix it, they said 'Sure!' Man, do i regret that. Ive been back to them at least 8 times, and im no closer to fixing the problem.

My problem is this: when im at slow speeds, there is this throbbing of the car, like the shoes are rubbing on the drums. Also, sometimes when i break a little hard, there is this really, really, loud screeching sound, like a train is coming to a halt. Ive brought the car back numerous times, and they keep saying that it needs to be "adjusted." So they 'adjust' it, and it works fine for about a mile and a half! I just cant seem to get anywhere with these guys.

The drums are all either new, or have been resurfaced, so i know they are not out of round, but i also heard that the problem could be that the shoes are not arced to the drum, but i guess its no longer common practice to arc the shoes to the drum?

Anybody have any clues as to what the problem could be?

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Old 10-30-2006, 06:00 PM
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How’s that hopey-changey thing
 
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hard linings will squeal , if the drums were turned and are thin the first hard brake stop could cause what is know as run out and will make a car feel like the drums are egg shaped. How many miles on the drums and how much were they turned, they nominally will not take very many turnings to get to a point that replacing them becomes the best practice, good luck not a bad problem over all but more then likely only new parts will cure. and softer linings.
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