i get a knocking sound coming from my front drums

[DarkoStoj]

I just turned the front drums because they were out of round and vibrating whenever I would brake. The shoes have a lot of meat on them, all the hardware looks like its in good shape, the brakes are adjusted, and I double checked to make sure the lugnuts were tight.

Whenever I stop I hear this sort of knocking sound coming from the front drums. It happends at slower speeds(probably because I can't hear it at faster speeds due to wind noise, etc.)

It happends every 1/2 second or so and I have no idea what it could be. I went through the brakes and everything seems tight and in good shape, I just gave it an alignment and changed the upper balljoints also, so the whole front end is tight.

I have the brakes adjusted to where if I spin it freely it will spin about 1.5-2 turns before the tires stop spinning. Is this too tight or too loose? I like the brake pedal pressure with the drums adjusted that tight so I left them like that.

I'm hoping to get this done tonight cause my club is cruising tonight and I need to represent the classic stangs!

 

[DarkoStoj]

I'm out of ideas, anyone?

 

[mikec35]

It could be that the shoes are not centered properly. An easy way to check would be to back off the shoes a couple of turns and see if the noise quits.. just don't back off so far you can't stop! You could also jack the car up and spin the wheels while a helper lightly presses the brakes. Just a few suggestions.. Mike...

 

[FasterThenU72]

are you sure that the drums are were turned perfectly? did you double check with one of those uhh...micrometer dealies...?

 

[65mistress]

I heard of knocking coming from a hub not being on tight enough. Granted that was on a model A. What kind of lateral movement do you have in the wheel?

 

[DarkoStoj]

i jacked up the car and checked for lateral movement but there is none. I just replaced the balljoints and the hubs are on there tight.

 

[65mistress]

Nothing loose in the brake, like a piece of spring or metal tab hitting the drum?

 

[jbsteven]

I have the same thing happening on one of my cars. Curious to see what people have found it to be.

 

[mustangdave]

Since you had the drums turned, they no longer match the shape of the brake shoe wear pattern and maybe they are grabbing and bouncing. If so, try beveling the leading edge of the shoe if it didn't come that way. The only other thing I can think of is grease in the drum.