Humming brakes

tshancock

tshancock

Member
If anyone could help with this problem I would appreciate it. My left front brake has a harmonic sound when I brake. Can't seem to figure it out.
 
They are hydraulic, 39. I like the idea of the angle on the pads. I have all ready
taken a small amount of metal from the drum on a lathe thinking a rust ridge may be the culprit.
 
Are they Adjusted correctly?? Might that particular one maybe need a slight bit more of an adjustment outward???
 
Actually it started doing this after I had taken all the wheel off checking for any problems. While I had the drum off I looked at wear patterns on the shoes and they were fine on every corner. Then I tighten them down with a half inch impact like an idiot out of habit and that's when it began.
 
Perhaps I am misreading your post.

"Then I tighten them down with a half inch impact like an idiot out of habit and that's when it began." Did you tighten the wheel bearing nut correctly?

If you used an impact on the wheel bearing nut you over tightened the wheel bearing causing the Humm. Hope you didn't score the bearing and race.

Assuming you tightened the wheel bearing nut by hand, I would still remove the drum and retighten by hand so as to correctly adjust the wheel bearing. Your Humm may be from the wheel bearing.

Look here:
https://www.fordbarn.com/forum/showthread.php?t=100299&showall=1
 
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tshancock said:
How does one adjust outward?
Click to expand...


This should help, ALSO in the upper right of the top of the "post" page is the "search" box, type in "brake adjustment" and you get several post on the subject. AND what 19Forty suggested "First"!!! There are as many "opinions" on how much to torque the nuts for the drum/axles as there are stars in the sky......I torque mine to 125Ft/Lbs......take that for what its worth and be prepared for all of the following fallout from that statement!!!!
 

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you say you machined the drum you may have cut a phonograph groove I know sound stupid but if you cut across to quickly you cut one long continuous groove the lining bites into the groove and tries to travel with it like the arm on a phonograph remedy polish drum with 80 grit emery tape
 
Actually it started doing this after I had taken all the wheel off checking for any problems. While I had the drum off I looked at wear patterns on the shoes and they were fine on every corner. Then I tighten them down with a half inch impact like an idiot out of habit and that's when it began.
 
No I've been cutting drums and rotors for quite some time, I know what you are talking about. The noise was before and after the cut, no change.
 
tshancock
I used a full sized cinder block as my pressure on the brake peddle. I pushed the peddle down with my hand, then leaned the block against the peddle. It sounds logically, to me, when you turned your drum and didn't adjust the brakes afterward....THEN....the shoes are NOW that much "further" away (X's 2) from making contact with the drum!!! IMO
 
I'll give it a try. Thank you all for your responses. Next time I'll try to be more specific in my descriptions.
 
Let Us know when you get it "humming a different tune"!!! how it all worked out and what you found the problem to be, It may help a "quite" barner who is a silent follower!!! As well as me at some point down the road
 
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