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07-29-2020, 03:07 PM | #1 |
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Oversized Brake Drums
I am working on putting together a set of 1935 Ford mechanical brakes & drums.
There are two different camps when the topic of brake drums comes up. The warning comes to not use brake drums if turned beyond 12.060 stating it is dangerous. Why? The folks who have worked on these for years will cite using drums turned well beyond 12.060, none so far can remember a drum failing? The drums I have turned to 12.100 have about .110 wall thickness. So is the warning because of drums failing, or overheating, or warping? Several shoes I have removed have paper like shim material under the lining to compensate for the drum diameter. I have not found thicker woven lining so I have made .030 metal shims to use with woven linings. Lots more experience here on The Barn than I have.......so do you see any pitfalls with using oversized drums with shimmed linings? Any one with experience of drums failing? Thank you!
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07-29-2020, 04:03 PM | #2 |
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Re: Oversized Brake Drums
Get involved in an accident even if brakes weren't an issue, having drums in excess of the maximum is looking for a lawsuit. JMHO.
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07-29-2020, 05:18 PM | #3 |
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Re: Oversized Brake Drums
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07-29-2020, 06:52 PM | #4 |
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Re: Oversized Brake Drums
I spent almost 8 years as an investigator for the California Department of Transportation's Legal Division. The last 2 1/2 years as the supervising investigator in charge of all law suit investigations pertaining to vehicle (and other) accidents. It does happen. The California Highway Patrol Multi Disciplinary Accident Investigation Team (MAIT) conducts lengthy accident reviews which focus on all factors that may have contributed to the cause of an accident, including brakes.
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07-29-2020, 09:31 PM | #5 | |
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Re: Oversized Brake Drums
Quote:
California, that just explained it. 🙂 |
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07-29-2020, 06:58 PM | #6 |
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Re: Oversized Brake Drums
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07-29-2020, 07:01 PM | #7 | |
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Re: Oversized Brake Drums
Quote:
That makes it simple. Just don't get involved in a FATAL accident, and just refuse to let anybody file suit against you! DD |
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07-30-2020, 10:16 AM | #8 | |
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Re: Oversized Brake Drums
Quote:
The person driving was eventually jailed. It was quite the sensation back then making a lot of the national news outlets. It also changed a lot of ways of doing business. No more oversize brake shoes were sold and no more "lesser quality" aka "economy" shoes / pads were sold to those trying to go "cheap". Only pads / shoes manufactured to the minimum required by the car maker were to be sold after that debacle. So, now you have heard...
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07-31-2020, 07:42 AM | #9 | |
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Re: Oversized Brake Drums
Quote:
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08-02-2020, 08:17 AM | #10 | |
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Re: Oversized Brake Drums
Quote:
Good for them and good for you
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07-29-2020, 04:07 PM | #11 |
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Re: Oversized Brake Drums
Overheating and brake fade as in no brakes.
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07-29-2020, 05:55 PM | #12 |
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Re: Oversized Brake Drums
I’m stuck on the application of a .060 limit to every drum ever made....
How thick are your brake drums after turning? What is your experience? Quote from another........ “Most drums are cast with enough thickness to allow 0.090" of wear. In other words, the difference between a drum's diameter when new and its discard diameter is 0.090," but that doesn't mean you can machine a drum right up to the 0.090" limit.
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07-29-2020, 06:37 PM | #13 |
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Re: Oversized Brake Drums
most machine shops won't turn beyond .060.
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07-29-2020, 06:54 PM | #14 |
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Re: Oversized Brake Drums
….only because it's ILLEGAL! You kill some baby with that 'old hot rod' and the Momma gets the 'right' attorney involved, they will tear that car apart looking for anomalies, and they'll make the remainder of your life unbearable! DD |
07-30-2020, 08:01 AM | #15 |
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Re: Oversized Brake Drums
I suspect you'll have a hard time finding any federal or state laws that prohibit drums from being turned to an ID greater than .060" oversize.
Laws will be written to prohibit exceeding the drum/disc manufacturer's recommended minimum thickness, not some arbitrary measurement of .060" or such. Manufacturer A's drums may only be able to be turned to 12.060", while Manufacturer B's drums may be able to be turned to 12.160".
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07-29-2020, 06:56 PM | #16 |
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Re: Oversized Brake Drums
just be careful if youre oversize , you'll need oversize linings to match, dont just buy off the shelf and expect them to work.
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07-29-2020, 07:10 PM | #17 |
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Re: Oversized Brake Drums
Doesn't even need to be an at fault accident. My son was T boned by a car that ran a stop sign (totalled a fresh restoration of my old 56 Chev pickup) 100% fault of the person who hit him. He was not injured thankfully but even so, the truck was taken to a shop and all 4 brakes were checked and measured. I kept a log of everything done on the truck and that was in the glove box, and everything I claimed I did was checked off as in good condition. If anything was off the insurance company of the person who hit him would not have paid anything and fought it in court. It is what they do, insurance companies have lawyers to do that and the average joe can't compete meaning afford to fight. They (after a year) settled for 30k but they strung it way out on something that was cut and dried, police issued a citation and everything.. It is false economy to use safety issue parts (steering, brakes, tires) that are not legal.
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07-29-2020, 07:53 PM | #18 |
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Re: Oversized Brake Drums
Some folks worry more that me. My wife was a fatality in a car accident. I followed her car from tow yard to junk yard, to junk yard, to a 'final' junk yard. I can assure anyone, that NO ONE ever came to inspect ANY portion of her car. And, I saw at least two things that I feel were manufacturers defects, that made her accident a fatal one. No one cared. And the insurance company paid promptly. My point being, some of the above posts present possibilities. But, seems to me, very unlikely. New or newer cars, yes, I wouldn't cut corners on drums or rotors. They are mostly inadequate when new, anyway. The shittiest brakes I've ever encountered, have been on modern, near new cars. I live in the mountains, and I've had at least two modern cars where I could warp the rotors on just ONE trip off the hill. But, for our 'old' cars, seems to me there is, and always was, a little extra margin. Obviously, opinion. And, goes without saying, I can predict opposing opinions.
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07-29-2020, 09:17 PM | #19 |
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Re: Oversized Brake Drums
It seems odd to me that anyone would want to deliberately build a vehicle in violation of the law. This type of stuff is what leads to government inspections to the level of being ridiculous. There are legal limits on how much you can turn a brake drum. If I remember correctly there are drums that can be legally turned beyond .060, but these drums are clearly marked as such.
Last edited by JSeery; 07-29-2020 at 09:43 PM. |
07-30-2020, 12:56 AM | #20 | |
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Re: Oversized Brake Drums
Quote:
Last edited by J Franklin; 07-30-2020 at 01:01 AM. |
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