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Post Info TOPIC: Help with my drum brakes.


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Help with my drum brakes.
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Hi everyone, 

I have a few test rides on my car so far, maybe 50 miles in total. And It appears that I've warped one or both of my front drums. (my car still had 4 wheel drum brakes which I completely rebuilt everything). When I apply the brakes, I get a pulsation through the steering wheel.

 

I thought I had everything adjusted really well, when I went and rechecked everything, if anything they seem to be a bit loose. With just a slight drag as the drum spins. 

The knee jerk reaction would be to buy a front disc brake kit, but I really don't want to do that. Has anyone else had trouble with their front drums quickly warping? 

Thank you 



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I would mark their position relative to the hub, pull the drums and look to see if the shoes were making contact in certain spots only. 

Clean the drums and shoes with brake cleaner, give the drums a scuff with scotch brite, re install them on a different spot on the hubs again.  Try it out again. If still bad, maybe get the drums turned.

Are the bearings good, adjusted right.



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cdnpont wrote:

I would mark their position relative to the hub, pull the drums and look to see if the shoes were making contact in certain spots only. 

Clean the drums and shoes with brake cleaner, give the drums a scuff with scotch brite, re install them on a different spot on the hubs again.  Try it out again. If still bad, maybe get the drums turned.

Are the bearings good, adjusted right.


 Thanks for replying,

I'll give that a try. I believe the wheel bearings are good. I installed new bearings and races. And If memory serves, I adjusted them with the following procedure. 

1.spun the drum while tightening the wheel bearing. 

2.torqued the wheel bearing to 14 ft lbs

3. backed off the nut until slightly loose.

4. I hand tightened the nut

5 then I loosened the nut until it lined up with the first cotter pin hole. 

 



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Not trying to be rude.....just trying to help.....a big mistake guys make is not placing the shoes on correctly and or in the correct order.
There is always a larger brake shoe and a smaller brake shoe.

Are the drums old and or the originals? Are the drums out of there safe service measurement. All Brake drums should be discarded after they have reached the minimum safety measurement.
Typically.....discard all drums at 9.590

Dan

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Postsedan wrote:

Not trying to be rude.....just trying to help.....a big mistake guys make is not placing the shoes on correctly and or in the correct order.
There is always a larger brake shoe and a smaller brake shoe.

Are the drums old and or the originals? Are the drums out of there safe service measurement. All Brake drums should be discarded after they have reached the minimum safety measurement.
Typically.....discard all drums at 9.590

Dan


 Hi Dan, that wasn't rude at all, that was the type of advice I was looking for. I'll take a look at the orientation of the shoes later today. It's possible I put them on backwards, but I usually play close attention to the orientation of the shoes. But I've also overlooked things in the past.

 

As far as the drums, they were bought new when I put the car together. All of the brakes were pretty ratty looking at the time. So I replaced all of the drums, shoes, hardware, lines and MC with new. But now that you mention the correct size of the drums, I'll still pull them off and measure them. Even though they were new, I've got some bad parts in the past.

 

Thanks! 



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I am sure you will figure it out

Dan

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Hi Mike
Just a quick note - our Big B Body’s use 11” drums all around and on the the drum there will be a cast mark that says something like
Maxdia that’s the maximum diameter. Once beyond that they should be discarded. If the drums were new when you did the brakes I doubt there out of spec. I like to do a cleanup cut “turning” on new drums just to make sure there round.The mfg of Most of the new ones these days tell you you don’t need to do that but I have seen some new ones out of round. With the 50 or so miles you have driven the car I doubt you have got the shoes bedded yet let alone got the drums hot enough to get any hot spots that cause a pulsating pedal or jerky steering wheel. Case in point i bought a “bargin” set of drums for my truck not to long ago when I did the rear brakes and didn’t check them. You guessed it they were out of round.
Good luck I’m sure it’s an easy fix
Larry

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Hi everyone, I wanted to update my thread. I got around to working on the brakes last night. Everything looked to be assembled correctly. I cleaned  the shoes and drums with brake clean, and I gave the drums a good scuff.

Then I reset the wheel bearings and they seemed to be way looser than they should have been. I checked my 67 chevy service manual, and going off of that procedure I had to tighten the bearings up a good bit. When I first set them, I was going off of memory of how I used to set the wheel bearings on my 86 Monte Carlo. Oops.

So I got the wheel bearings and brake shoes readjusted and I plan on going for a test ride at some time tonight. I'll report back with my results. 



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