XPost: comp.mobile.android, misc.phone.mobile.iphone
From: scharf.steven@geemail.com
On 5/11/2022 5:20 AM, Xeno wrote:
> Nope, they were warped and wouldn't clean up *before* they went below
> minimum thickness. In the early days I tried a few, found I was wasting
> my time machining them, then started relying on *measurements* to
> determine serviceability after machining. It's only involves simple
> arithmetic. Discs these days are like spark plugs - the cost of repair
> due to time involved is outweighed by the low cost of new items.
"Back in the olden days" I kept a spare set of rotors so when I was
doing a brake job I didn't have to stop and take the rotors to be
machined in the middle of the work. I'd then take the rotors that I
removed to be put on a lathe (for free since my relative had a repair
shop) and they'd be ready for the next brake job in 25,000 miles or so.
But back then discs were thick and heavy and could be machined multiple
times before they were too thin. Nowadays rotors are so thin they can
usually not be machined even once, but they've also become less
expensive (when adjusted for inflation).
My brother-in-law saw a lot of vehicles with warped rotors back in the
mid-1990's to 2000's, when the manufacturers started making them very
thin without the material science knowledge of how to prevent warping.
Just one serious overheating and the rotors were warped beyond repair.
There was one GM brand, that is now defunct, that was particularly
susceptible to warped rotors. His shop was in San Francisco and there
are lot of very steep hills (when San Francisco was first laid out the
proposal was to not do a grid because of the hills, but to have roads
winding up the hills; real estate people protested that this would be
too complicated).
Is someone actually claiming that disc rotors don't warp? That would be
very surprising since nearly every car mechanic in the world is well
aware of this issue
,
,
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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