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Welcome to the CJ-3B Bulletin Board, the forum of The CJ3B Page. Everyone is invited to view the postings here, but you must register as a member in order to post messages. The moderator reserves the right to remove items posted. Items may be archived on the Tech Tips page. If you post a problem, please follow up by posting the solution when it is found, as it will likely be useful to other readers. For bulletin boards and e-mail lists covering other Jeep models, see the bottom of this page.

 

 

 Brake Drum runout
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t56tr
Posted: Jun 22 2012, 09:11 AM


Member


Group: Members
Posts: 45
Member No.: 1,031
Joined: 6-February 11
I had a set of old drums turned by joeblow tire shop. While they look nicely resurfaced, they seem to have run out of about .030. Can they even be used, or are they junk? Will I feel that if used?

In regards to new drums, I have read that they can even come with runout...


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54' 3B - 3A glass tub orig steel 3b cowl/dash/hood/ F134 1" superlift 16 steel wheels ndcc's
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oldtime
Posted: Jun 22 2012, 09:42 AM


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Posts: 3,554
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Joined: 12-July 08
By the term "runout" I must suppose that you imply a .030 deviation from its true axis.
In other words its was turned round but its way off center.
Wow.... that implies obvious incompetence.

If you install the drums as they are the braking force will be greatly diminished.
Also the pedal lever will pulsate (rapidly move up and down) as you apply the brakes.
So its not realistic to use these drums as they currently are.

If enough of the drum remains you can return them to correct the excessive runout problem.
The maximum inside diameter allowed is 9.060".

Post a WTB, if you need a pair or a complete set of original 9" Kelsey Hayes drums.


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1953 TRANS-VINTAGE CJ-3B / AC 4693 fuel pump / YF 938 SD / Hurricane / 9-1/4" Auburn clutch / T90-C / 2.46 ratio D-18 / Warn O.D. / 5.375 final drive / Powr Lok Front + Rear / Dualmatic drive flanges / deluxe Koenig half cab / 12 volt generator
2nd full re-build using the best from all vintages of CJ-3B

1962 OPTIONAL-STOCK CJ-3B / Warn O.D. / Tigertop / Transport yellow (orange)
Currently serving as my one and only DAILY DRIVER

St Louis
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t56tr
Posted: Jun 22 2012, 12:53 PM


Member


Group: Members
Posts: 45
Member No.: 1,031
Joined: 6-February 11
I mounted them backwards on the front hub with the three small screws then set up a dial indicator and spun it 360.... Dnt know if thats relaibale enough.

Are your drums nos?


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54' 3B - 3A glass tub orig steel 3b cowl/dash/hood/ F134 1" superlift 16 steel wheels ndcc's
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oldtime
Posted: Jun 22 2012, 01:06 PM


MODERATOR


Group: Co-Admin
Posts: 3,554
Member No.: 3
Joined: 12-July 08
Well that sure sounds like a reasonable way to check the runout if your wheel bearings are good.
.030 is just way to far out.
Hey Looky.... I actually got to use the term FAAAAR --- OUT !
If they are truely that far out you should probably be able to see the difference between the thin and the thick sides of the drum face.

Anyway the only NOS drums I have are for the 10" brakes.
I'll try to post my other stuff on the F/S forum.


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1953 TRANS-VINTAGE CJ-3B / AC 4693 fuel pump / YF 938 SD / Hurricane / 9-1/4" Auburn clutch / T90-C / 2.46 ratio D-18 / Warn O.D. / 5.375 final drive / Powr Lok Front + Rear / Dualmatic drive flanges / deluxe Koenig half cab / 12 volt generator
2nd full re-build using the best from all vintages of CJ-3B

1962 OPTIONAL-STOCK CJ-3B / Warn O.D. / Tigertop / Transport yellow (orange)
Currently serving as my one and only DAILY DRIVER

St Louis
Top
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