Chevy P30 Chassis 1973 brake rotor clearance.
I had to replace the front rotor on my '73 P30 Sportscoach RV. The local NAPA had no listing for '73 dual rear wheel P30, but they did have one for the '75 and the rotor matched all dimensions, excep...
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If you only knew the tolerances on new parts, you'd gag. Rotor manufacturers EXPECT professionals and consumers alike to take new rotors to a machine shop and have them turned. High speed machines at the foundry put a rough turn on cast rotor friction surfaces. Only the bearing bores are (hopefully) finished turned.
Wanna know what those two rotors sounded like when a machine shop chucked them up and made the first pass?
"Scrape.......scrape......scrape......scrape......scrape"
Perhaps (I do not know this for sure) only rotors sold at new cars dealerships are "Plug & Play". This has probably changed as well. Buy anything, and the inch-thick paperwork consists of 3 pages in English and a dozen pages devoted to disclaimers.
"New" rotors must be turned. Period.
Wanna know what those two rotors sounded like when a machine shop chucked them up and made the first pass?
"Scrape.......scrape......scrape......scrape......scrape"
Perhaps (I do not know this for sure) only rotors sold at new cars dealerships are "Plug & Play". This has probably changed as well. Buy anything, and the inch-thick paperwork consists of 3 pages in English and a dozen pages devoted to disclaimers.
"New" rotors must be turned. Period.
