I just installed two new front brake rotors. They both have
exactly .005’’ runout. I disassemble them, and turned them 180*, and
the runout moved 180*. I assume the hub face is out, and the rotors
are true. Is this a large probem? It seems to be within tolerence
of the manual. Wheel bearings are .003’’ endplay, but I checked the
runout while tight.
Thanks in advance.–
A car with bad brakes or steering is an unguided missile.
Anaheim, Ca., United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Big2Bird sent Fri 4 Dec 2009:
Hi BB, I don’t understand what you did when you turned them
180*.Also what car do you have, not that its particularly
relevant I suppose.–
The original message included these comments:
I just installed two new front brake rotors. They both have
exactly .005’’ runout. I disassemble them, and turned them 180*, and
the runout moved 180*. I assume the hub face is out, and the rotors
are true. Is this a large probem? It seems to be within tolerence
–
John M Holmes 1973 E Type SIII Supra 5Sp, 70 SII OTS 05XJ8L
Ontario, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Big2Bird sent Fri 4 Dec 2009:
I found a similar problem when I replaced rotors - except my
runout was about .01. I ended up shimming the rotor to
runout within specs.–
The original message included these comments:
exactly .005’’ runout. I disassemble them, and turned them 180*, and
the runout moved 180*. I assume the hub face is out, and the rotors
are true. Is this a large probem? It seems to be within tolerence
–
Gary Herzberg, 63 3.8 FHC 66 Series 1 OTS, 98 xk8
Montana, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from John M Holmes sent Sat 5 Dec 2009:
I seperated the hub and rotor, and reassembled them 180* .(I turned
the rotor 1/2 way). Well, as close to 180* as you can with 5 holes.
It’s a series 1 1/2 E Type.–
The original message included these comments:
Hi BB, I don’t understand what you did when you turned them
180*.Also what car do you have, not that its particularly
relevant I suppose.
–
A car with bad brakes or steering is an unguided missile.
Anaheim, Ca., United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Big2Bird sent Sat 5 Dec 2009:
If the runout moved when you moved the rotors, surely it’s the
rotors that are out, not the hubs?–
'69 Series 2 2+2
Hertford, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Tim Roberts sent Mon 7 Dec 2009:
Hmmm… depends if you’re measuring relative to the rotor or
relative to the hub, I suppose…–
'69 Series 2 2+2
Hertford, United Kingdom
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Tim Roberts sent Mon 7 Dec 2009:
Okay. The original question. Is .005’’ runout an issue?–
A car with bad brakes or steering is an unguided missile.
Anaheim, Ca., United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Big2Bird sent Mon 7 Dec 2009:
No, that’s not enough to be concerned about.–
Ray Livingston - '64 OTS Santa Cruz, CA
Santa Cruz, CA, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Tim Roberts sent Mon 7 Dec 2009:
Okay. The original question. Is .005’’ runout an issue?
As Ray said, that is almost unmeasurable in the greater scheme of things.
Reminds me of something I read on a woodworkers forum recently.
Machinist friend of a woodworker took up woodworking as a hobby. Was
complaining to his friend that the saw blade on his new 10 inch table
saw was .002 out of alignment with the fence and he couldn’t get it any
better!
In woodworking, the smallest deviation one tends to be concerned about
is 1/32nd of an inch, roughly .032.
In reply to a message from Wiggles sent Tue 8 Dec 2009:
Ray is correct, .005’’ is not a big problem on these cars. The only
way I ever achieved .000’’ runout on a rotor re-cut was to mark the
rotor with a sharpie pen to show the actual dial ind readings
before removing. Then at the brake shop I had the machinist check &
fiddel with mounting rotor on the lathe till he got the same
readings before he turned the machine on. Perfect results every
time.–
The original message included these comments:
In reply to a message from Kim Duleff sent Tue 8 Dec 2009:
Thanks guys. I appreciate the answers. See my next thread for my
only other issue.–
A car with bad brakes or steering is an unguided missile.
Anaheim, Ca., United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
