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Old 02-03-2021, 07:20 PM   #1
rockfla
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Default Brake knocking

Okay
Did some brake work/correcting a few issues on the 39 Merc, one of which the rear shoes were on incorrectly. When I got it all back together and took the first test drive there was a knocking sound coming from the right rear, like maybe the e brake cable had come off and was rapping against the drum every rotation of the drum!! I pulled the drum tonight and I don’t see anything amiss??? Do any of you??? And or have suggestions????


SORRY the upload from the SPYphone turned my pictures for some reason?
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Last edited by rockfla; 02-04-2021 at 07:54 AM.
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Old 02-03-2021, 08:23 PM   #2
Talkwrench
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Default Re: Brake knocking

Might be coming from further in ...
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Old 02-03-2021, 09:35 PM   #3
Phil Gillespie
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Default Re: Brake knocking

Axle nut pulled up tight on taper. Approx 200ft/lbs required here.
Hub slack on keyway and key if above not tight. Would make a similar noise.
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Old 02-04-2021, 02:11 AM   #4
Lawrie
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Default Re: Brake knocking

I had a knocking every time I braked ,it was on the rear, was a loose shackle bush.
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Old 02-04-2021, 06:58 AM   #5
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Default Re: Brake knocking

I had a similar problem after I replaced axles on my 41. The drivers side eBrake arm was slightly protruding and rubbing against the ridges inside the brake drum. Took me a while to find until I found the wear marks. Made a helluva racket!
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Old 02-04-2021, 07:52 AM   #6
rockfla
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Default Re: Brake knocking

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Quote:
Originally Posted by Phil Gillespie View Post
Axle nut pulled up tight on taper. Approx 200ft/lbs required here.
Hub slack on keyway and key if above not tight. Would make a similar noise.
Phil NZ
I "HAD" it actually torqued to 204lbs by the time the cotter pin hole was able to take the cotter!!! SO by this I was well to the point!!!

Last edited by rockfla; 02-04-2021 at 09:04 AM.
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Old 02-04-2021, 08:17 AM   #7
alanwoodieman
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Default Re: Brake knocking

look in the drum to see where it was hitting, also see if the shoes are properly seated , sometimes one of the brass "slugs" will fall out when assembling shoes
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Old 02-04-2021, 09:18 AM   #8
Juergen
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Default Re: Brake knocking

I don't know if it is the cause of your thumping, but you are missing a clip which prevents the emergency cable return spring from entering the tube. The spring pushes the lever always into the release position. Could the brake shoe be dragging on and off?
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Old 02-04-2021, 10:34 AM   #9
GaryU.
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Default Re: Brake knocking

Saw the same thing Juergen, clip missing on spring.
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Old 02-04-2021, 10:37 AM   #10
rockfla
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Default Re: Brake knocking

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Originally Posted by GaryU. View Post
Saw the same thing Juergen, clip missing on spring.
Got them coming!!! Thanks Juergen & GaryU
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Old 02-04-2021, 02:55 PM   #11
Terry,OH
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Default Re: Brake knocking

To my eye the brake linings appear to be much thicker at the top than the bottom??
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Old 02-04-2021, 03:13 PM   #12
rockfla
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Default Re: Brake knocking

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Originally Posted by Terry,OH View Post
To my eye the brake linings appear to be much thicker at the top than the bottom??
The angle at which I was sitting to take the picture with my phone, I wasn't level I was actually a little above the fender opening!!!
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Old 02-04-2021, 07:51 PM   #13
deuce_roadster
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Default Re: Brake knocking

If the key was in wrong it could prevent the hub from seating on the taper. The key itself is tapered at one end for a reason.
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Old 02-07-2021, 04:08 PM   #14
rockfla
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Default Re: Brake knocking

I think I found my issue.......the E-Brake lever is semi cattywompass and is slightly angled out at the bottom which is hitting the backs of the wheel studs. I believe that the little washer I put between the shoe and the lever instead od between the head of the pin and the lever THUS moving the lever further out than it should be!!!

Thanks for all the advice and suggestions and expert eyes!!!
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Old 02-07-2021, 06:08 PM   #15
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Default Re: Brake knocking

Good save, Rockfla. Lots of good tips and things to watch out for.
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