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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Apr 2010 Posts: 146 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2010 Posts: 146 | While working on updating my entire brake system, I recently had my front drums measured for inside diameter. Passenger side measured 11.139 and the driver side measured 11.102. Is this out of spec? Is the factory 11.00? The guy who owned the shop said he hadn't used that tool in a long while and mentioned that his father had worked on the "old" drums back in the day. I mentioned arching shoes and he knew of no one in town that still does that. I'll be replacing the shoes and was wondering if I should get new drums as well. Thanks | | | | | Joined: Sep 2010 Posts: 1,704 back yard wrench turner | | back yard wrench turner Joined: Sep 2010 Posts: 1,704 | IIRC 60 thousands over is the max allowed. Factory is 11.00. I think I would buy new ones. They are not very expensive.
Wayne1938 1-Ton Farm TruckStovebolt Gallery Forums1989 Silverado 1996 Mustang GT convertible When I die, I hope she doesn't sell everything for what I told her I paid for it! | | | | | Joined: Feb 2004 Posts: 29,771 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,771 | Actually, I believe the oversize limit for truck drums is .090". The dimensions you've got are so close that at least one more set of brake shoes should work as long as the drum surface is smooth. If the drums are scored or out of round, don't try to machine them any bigger.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | I think that is streaching it a bit. Those 1/2 ton drums are the same as a car. Ive seen them running that thin but you will have better brakes with new drums. Like Vert says, they are not that expensive & are readily available.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | | | | | | Joined: Dec 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | "While working on updating my entire brake system"
Lose the front drums in favor of disc brakes. Keeping the drums is not an update! | | | | | Joined: Apr 2010 Posts: 146 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2010 Posts: 146 | Thanks for the info guys. I'll shop around and pick up a new set of drums. What do I use to put the hubs on the new drums? Do I just drill out the existing factory rivets? | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | the rivets aren't needed, frequently already gone on these old rigs - drill them part way from the inside and drive them out, or sometimes you can slam the drum down on a hard surface and the hub will come loose
Bill | | |
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