Rick, my info for 1956 shows the following:
Front 3100 = 11 x 2
3600 & 3800 = 12 x 2
Rear 3100 = 11 x 1-3/4
3600 = 12 x 2
3800 = 14 x 2-1/2
>Also, what is the purpose of the large concentric bolt that the brake shoes
>pivot on? Why is it concentric?
This is used to center the brake shoes in the drum. When installing new or
adjusting the brakes loosen the eccentric bolt, adjust the shoes tight, hit
the side of the drum with a rubber hammer (back and forth) to shake the
shoes into place, try to tighten the adjuster again, once they are tight
lock the eccentric bolt in place, now back the adjuster off until the drum
will just spin and you are done! This is from memory. I hope I didn't
This process allows full contact between the shoes and the drum.
Mike B. '56 8400 Wrecker :)
From: RickK10071@aol.com <RickK10071@aol.com>
To: firstname.lastname@example.org <email@example.com>
Date: Friday, November 05, 1999 4:03 PM
Subject: [oletrucks] Brake help
>I am trying to redo the brakes on my 1957 3800. My parts man shows all 3/4
>ton brake shoes as 11" x 2", but my rear drums seem to measure at 12" x 2".
>think I am meaasuring correct (across the drum) but someone please verify.
>Also, I have added an adapter kit for the master cylinder and I installed a
>new master cylinder that lists for a 1973 1/2 ton Chevy with manual brakes.
>Once installed I found that the fittings for the two brake line outlets are
>not identical. Which one should go to the fronts and which to the back?
>Thanks for any help or suggestions you may have.
>Rick in Iowa
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959