Posted by k6zrx on June 04, 2011 at 06:42:03 from (75.22.180.247):
In Reply to: OT. 35 ply PJ Brakes posted by robertmn on June 03, 2011 at 16:15:21:
There are two adjustmetn cams per wheel on the Lockheed brakes. Sounds like they are not adjsuted and the brakes are retracting fully instead of being stopped by the cams. They will be the hex heads on the back side of each backing plate. To lessen the clearance between shoe and drum, what you need to do, turn them in the same direction as the wheel would turn going forward. You should be able to lock the drum. Back off until a very slight drag is felt. Do this on all 8 adjusters. If the anchor pins are our of whack, then you really need the proper brake gage which is rare and expensive. The old Motor"s manuals give a method where you cut a slot in the anchor pins to allow adjustment from the back with the drum on. The gage measures each drum and then fits on the spindle or axle to allow the shoes to be adjusted without the drum in place so you can turn the anchor pins. When adjusted right, these cars stop really good, unlike most cars with fron drum brakes. Maybe an old time shop in your area has the gage. I got the Ammco tool off eBay, but not without parting with a lot of $$$. I think it is necessary when you have three cars with these brakes, and two of them are daily drivers. Could also be master cylinder residual presure valve. Had taht with my Desoto, but the pedel would not go to the floor if the cams were adjusted right. Email me if you need to. Most guys work off memories of long ago, while I still drive these cars every day. "48 DeSoto, "50 Dodge, and "56 Plymouth. I can email you a PDF from a later service manual, same brakes.
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