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Old 03-26-2013, 01:04   #1 (permalink)
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Drum Brakes Pulsing

Hey everybody, I just replaced everything on the forward drums of my '70. Shoes, drums, cylinders, springs, the whole shebang, the problem now though is that the car shakes (pretty violently) when I come to a stop from anything above 25mph, I know this isn't normal, but it's also the first time I've replaced the forward drums on anything, I'm thinking maybe some grease snuck onto the braking surfaces while I was working on them? any other ideas as to why this is happening would be greatly appreciated.
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Old 03-26-2013, 04:36   #2 (permalink)
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Re: Drum Brakes Pulsing

On most drums over here they are coated to preserve / prevent rust and it has to be washed off prior to fitting , not something as simple as that ? You could pull the drums of and see if any high spots on shoes and if the shoes are wearing , bedding in evenly . If not any of them , ask a local garage to stick car on rolling road brake tester and see what front brake balance is like .You can run each wheel individually to tie down what side is causing the problem , or may be both .
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Old 03-26-2013, 12:46   #3 (permalink)
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Re: Drum Brakes Pulsing

Actually, an anti-rust coating makes sense, they were definitely coated (at least on the outside) with SOMETHING when I put them together, but I didn't bother to try washing it off, I'll give them a once over with soap and water and see what happens.
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Old 03-26-2013, 13:07   #4 (permalink)
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Re: Drum Brakes Pulsing

The brake drums used to be coated inside on the braking surfaces also on the ones we had . We used to wash them with brake cleaner or petrol / gas to remove the protection .Doubt if soap and water would work good .
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Old 03-26-2013, 14:14   #5 (permalink)
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Re: Drum Brakes Pulsing

Get some Brakeclean to clean them as you may need to clean the shoes with it as well now.
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Old 03-27-2013, 14:36   #6 (permalink)
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Re: Drum Brakes Pulsing

Will do, luckily it's not my daily driver right now.
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Old 03-27-2013, 21:03   #7 (permalink)
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Re: Drum Brakes Pulsing

Been there, done that before. I had to lightly sand the shoes to get the contaminate off of them.
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Old 03-28-2013, 07:29   #8 (permalink)
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Re: Drum Brakes Pulsing

Could also champfer leading edge of brake shoes if it's not already got it .
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Old 04-12-2013, 17:36   #9 (permalink)
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Re: Drum Brakes Pulsing

well, I've tried all these suggestions and even replaced the shoes with a different (better fitting) set and still no change, I think the rolling road brake tester might be my last option, somebody must've dropped these drums between the factory and the store because it sure isn't something I did... This is beyond frustrating right now...
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Old 04-12-2013, 19:03   #10 (permalink)
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Re: Drum Brakes Pulsing

My first thought was the drums being out of round. Shame to turn something brand new, but it could get them back to being true.
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