Author Topic: brake drum hole size  (Read 385 times)

Offline sledhead

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brake drum hole size
« on: March 26, 2020, 04:51:08 AM »
Hi guys

I got a replacement brake drum for the coach and my guy that is installing them noticed that the 10 x bolt holes are bigger then the old webb drums ?
Webb drums have holes about .878 and the replacements are 1.13 .
He call the supplier and after some investigating was told they are the right replacement for the webb 6685 rev b drums

when he put on the drums on there is a good size gap around each bolt and the parts supplier tells him that after the drive wheels are installed and torqued to 500 lbs all will be good . As he works on dump trucks most of the time he thinks this is not right ?
the old drums are from 1999 could it have changed over time ? 

any ideas ?

thanks   dave
dave , karen
1990 mci 102c  6v92 ta ht740  kit,living room slide .... sold
2000 featherlite vogue vantare 550 hp 3406e  cat
1875 lbs torque  home base huntsville ontario canada

Offline luvrbus

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Re: brake drum hole size
« Reply #1 on: March 26, 2020, 05:30:54 AM »
If the hub center matches they are ok,stud pilot drum ?
Life is short drink the good wine first

Offline sledhead

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Re: brake drum hole size
« Reply #2 on: March 26, 2020, 11:17:03 AM »
sorry it took so long to get back as my puter is out for a upgrade

stud piloted drum

thanks   dave
dave , karen
1990 mci 102c  6v92 ta ht740  kit,living room slide .... sold
2000 featherlite vogue vantare 550 hp 3406e  cat
1875 lbs torque  home base huntsville ontario canada

Offline luvrbus

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Re: brake drum hole size
« Reply #3 on: March 26, 2020, 12:21:34 PM »
sorry it took so long to get back as my puter is out for a upgrade

stud piloted drum

thanks   dave
 

They do that now on stud pilot drums so 1 drum works on the front or the drive axle
Life is short drink the good wine first

Offline sledhead

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Re: brake drum hole size
« Reply #4 on: March 26, 2020, 12:43:52 PM »
looks scary to me but if it is legal and safe + the 500 lbs that hold the wheel's on I hope all is good .

thanks   dave
dave , karen
1990 mci 102c  6v92 ta ht740  kit,living room slide .... sold
2000 featherlite vogue vantare 550 hp 3406e  cat
1875 lbs torque  home base huntsville ontario canada

Offline luvrbus

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Re: brake drum hole size
« Reply #5 on: March 26, 2020, 01:45:11 PM »
looks scary to me but if it is legal and safe + the 500 lbs that hold the wheel's on I hope all is good .

thanks   dave


That drum most likely works for a hub center application too
Life is short drink the good wine first

Offline sledhead

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Re: brake drum hole size
« Reply #6 on: March 26, 2020, 03:58:54 PM »
that's what we were thinking to . It would be nice if there were collar spacers that could be put in to make up the space . I looked up on the webb drum site and all the new replacements are minimum 1" holes .so for now the drums are siting on the floor until I can see if there is any other option out there . As we can't leave home anyway with this covid 19 thing. now that the brakes are done and found a inner axle seal was just started to leak has been replaced and a new exhaust system it is time to change out the rear end fluid as I am sure it has been in there for 20 years . But after draining it ,it looks good ? then it is to the transmission and replace the o rings in the lines a the transmission that are leaking a few drops and change the trans. fluid and filters again to finish the change to syn fluid .
After that I think all my up keep will be done

dave     

 
dave , karen
1990 mci 102c  6v92 ta ht740  kit,living room slide .... sold
2000 featherlite vogue vantare 550 hp 3406e  cat
1875 lbs torque  home base huntsville ontario canada

Offline luvrbus

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Re: brake drum hole size
« Reply #7 on: March 26, 2020, 06:17:37 PM »
Look at the space on the studs on the rear axle putting the wheel on
Life is short drink the good wine first

Offline sledhead

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Re: brake drum hole size
« Reply #8 on: March 27, 2020, 04:26:10 AM »
It looks like the drum centers good on the wedges that are there but what happens when the brakes are hit hard when some dumb @$# cuts if front of me ? time will tell

thanks  dave 
dave , karen
1990 mci 102c  6v92 ta ht740  kit,living room slide .... sold
2000 featherlite vogue vantare 550 hp 3406e  cat
1875 lbs torque  home base huntsville ontario canada

Offline luvrbus

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Re: brake drum hole size
« Reply #9 on: March 27, 2020, 06:35:55 AM »
They won't even shear the bolts holding the drum to hubs all the ones I have seen Webb is not going to sell you drums that would endanger your safety
Life is short drink the good wine first

Offline chessie4905

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Re: brake drum hole size
« Reply #10 on: March 27, 2020, 07:11:26 AM »
If the holes are larger than stud size, picture which way the drums would try to rotate vs the wheels upon a major stopping event. Rotate the drum slightly against that side of the studs. Although I would think that 10 stud/nut clamping force of 450 lb. ft. would not allow the drums to shift.
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Offline luvrbus

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Re: brake drum hole size
« Reply #11 on: March 27, 2020, 07:24:36 AM »
I am sure he can find old stock if he worries about it but drums have been like that for awhile ,the 1st I saw was on a Prevost and the holding screws were still intact
Life is short drink the good wine first

Offline buswarrior

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Re: brake drum hole size
« Reply #12 on: March 27, 2020, 07:31:30 AM »
Here's what these (profanity deleted) ads embedded in the middle of thread showed me just now....

I thought there was some comedy... but its just google... beware, they get much better, the meaning of threads will get skewed...
Frozen North, Greater Toronto Area

Offline luvrbus

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Re: brake drum hole size
« Reply #13 on: March 27, 2020, 08:32:02 AM »
Meritor has some good reading about brake drums on the internet
Life is short drink the good wine first

Offline brmax

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Re: brake drum hole size
« Reply #14 on: March 27, 2020, 08:54:28 AM »
The garbage ads allowed by the site will be its end. Just as many before.
Sad to hear but the dam fact.

Have a good day
Later!
1992 MC9
6V92
Allison