Author Topic: X-code brake rear shoe size/drum question.  (Read 1581 times)

Offline DeadStang

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X-code brake rear shoe size/drum question.
« on: September 13, 2011, 12:11:06 AM »
I'm working on an odd Pony--it's an X-code California Special.  It has 4-wheel manual drum brakes and I've started on the R rear...  I only do one side at a time when I do brakes, and I don't take anything apart until I have a replacement in hand so I can do swaps quickly before I forget what stuff looks like and where things go.

Took the drum into Car Quest today, hoping to have it turned, but it measured beyond their tolerances.  So I'm looking at the NPD Catalog to order a set of shoes and a new drum and they list 10" x 1 3/4" for a '68 390, and a 10" x 2", also for a '68 390.  So I tried to measure the shoe width themselves, and the contact surface on the inside of the drum.  I also happen to have the drums off my '69 B2, and I know those are supposed to be 10" x 2", but the shoe pads are affixed to the backing plates differently on that car, and the insides of the drums are formed slightly differently.  For both cars, the shoe pads measure just slightly under 2" in width (but not the same width), and the contact areas within the drums are also a few 32nds off from each other, and are also slightly under 2" of contact.  Neither car has the original pads in place, although both are low-milers with original drums.

Advice on what I should order for this car?  Thanks!

Offline Oz390

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Re: X-code brake rear shoe size/drum question.
« Reply #1 on: September 13, 2011, 08:40:44 AM »
I've got an X code on the way over, so can't check it... but I just did a Dec 67 San Jose build 68 S code and ordered the 2"... locked up the drums when installed.  Not sure if it is a plant issue or some clear date-in-time change (which would seem odd as then the early would be smaller pads, so not a cost savings as with a lot of mid-68 run changes).

Possibly realted to the rer end ratio or ....  looked into it a bit when I had my issue and found no clear cut answer.
8R03S : 76A I 2A 15M 72 5 U
8R01S : 65A B 2A 28M 72 7 5 - Factory GT
8R01C : 65A M 2A 01E 72 2 W - Cal Special
8F01X : 65A I 2A 2G 20E 24 1 U - EXP500 repli-bute

Offline TLea

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Re: X-code brake rear shoe size/drum question.
« Reply #2 on: September 13, 2011, 09:15:34 AM »
They are 10" x 1 3/4"
Tim Lea  Shelby concours judge MCA, SAAC, Mid America

Offline ruppstang

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Re: X-code brake rear shoe size/drum question.
« Reply #3 on: September 13, 2011, 09:44:57 AM »
I allways thought they used 2 inch if manual fronts and 1 3/4 if power discs? Marty

Offline DeadStang

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Re: X-code brake rear shoe size/drum question.
« Reply #4 on: September 13, 2011, 12:32:27 PM »
They are 10" x 1 3/4"

OK, this is what I'll order then. 

Thanks!