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Joined: Apr 2008
Posts: 37
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Apr 2008
Posts: 37 |
Does anyone have the max. allowable dimensions for turning front and rear brake drums on a '56 P/U? I have a shop manual on order but need the info now.
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Willwood Engineering
Wilwood Engineering designs and manufactures high-performance disc brake systems.
Wilwood Engineering, Inc. - 4700 Calle Bolero - Camarillo, CA 93012 - (805) 388-1188
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Joined: Dec 2001
Posts: 865
ChatMaster - 750
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ChatMaster - 750
Joined: Dec 2001
Posts: 865 |
If you need your drums turned take them to a machine shop that does that kind of work. They have a gauge that will determine if the drums can be turned. If the drums have already been turned to their limit the shop will tell you so. The shop that I use will gauge them and if they have already reached their limit they will refuse to turn them.
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
This makes the assumption that the brake service shop has the data for the older drums. In most cases, a far stretch.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Dec 2001
Posts: 865
ChatMaster - 750
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ChatMaster - 750
Joined: Dec 2001
Posts: 865 |
Just trying to be helpful, no assumption was made. It may be a "far stretch" in your area, we don't have that problem here.
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Joined: Dec 2001
Posts: 11,162
ChatMaster - 10,000
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ChatMaster - 10,000
Joined: Dec 2001
Posts: 11,162 |
Every machine shop around here that turns drums has the specs for maximum drum ID even for the 30s and forties. Most of our Auto supply stores has a sign "We turn rotors and drums" the smaller stores send them out.
There is a band that is used on the older drums to keep them from vibrateing during the turning or grinding operation. If a machine operator fails to band up your older drums (thinner ones) he don't know enough to do the job.
Life's a long winding trail, love Jesus and ride a good horse!
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Joined: Nov 2001
Posts: 29,863
Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
Joined: Nov 2001
Posts: 29,863 |
The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Joined: Jan 2010
Posts: 648
Oil Can Mechanic
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Oil Can Mechanic
Joined: Jan 2010
Posts: 648 |
This doesnt answer your question i know but i just wanted to add that SOME brake shops out there are still knowlageable about turning drums for our older cars but those shops are becoming FEWER and far(er) between each day, it seems.
Scary thing is that some machine shops of today lack the same knowlage.
So be careful whom you take drums too.
In my shop, quality is a standard, NOT and option.
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Joined: Jan 2002
Posts: 2,299 Likes: 8
ChatMaster - 2,000
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ChatMaster - 2,000
Joined: Jan 2002
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I think 11 1/8" is MAX over size
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
That same drum was used on the rear of 1970 full sized cars so look at the specs for that. Usually .080" is the recommended limit.
Gene Schneider
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Joined: Apr 2008
Posts: 37
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Apr 2008
Posts: 37 |
Turn out that the limit is 0.060" oversize. Chevy made linings 0.060" oversize to match this limit. This is from the shop manual which finally arrived.
Last edited by jschluter; 02/22/11 06:55 PM.
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