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86 Caprice Rear Brakes Vibrating/Pulsing

The rear Brakes of my car were pulsing (I have already done a complete front brake job). I changed the drums, but not the shoes as they still look good. I sanded them a bit. With the new drums the brakes went from pulsing to vibrating. Today I jacked the car up and made the hubs spin with the engine. There is little to no side to side movement but definitely a bit of up and down movement on the outside edge of the hubs. There is little play in the bearings. . The vibrating seems to get worse as the car is driven. Do I just need new shoes or could axle runout be an issue? I have worked on these models for 25 years and never encountered this problem... Thanks

Reply to
Big Al
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How do you know it is the rears?! What do you mean by "pulsing"?!

Reply to
dahpater

I'd first be sure the drums themselves weren't out of round. Chinese?

Reply to
clifto

They are Monroe, I believe made in the states or Mexico, I though of that too, switched them around this afternoon, the vibration is less but still coming from the driver"s side. I will try new shoes soon, should have done it in the first place.

Reply to
Big Al

Try using the parking brake to slow the car. Do you feel the vibration then?

Did you have the new drums turned? They could have been stored/shipped improperly and be out of round.

Reply to
Caleb

Yes, to be sure I used the parking brake, the problem is in the back. Never thought of having the new drums turned, but that might find/solve the problem. Thanks

"> > Try using the parking brake to slow the car. Do you feel the vibration then?

Reply to
Big Al

If the old drums were turned oversize, the old shoes will be worn in to an oversize diameter. They will hit on the edges first. Most noticeable as a "grabbiness". Try new shoes.

Reply to
Steve Austin

Reply to
Big Al

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