Sponsored Content
s
I purchased new slotted rotors from Vette Brake Products and I'm having trouble with rotor run out on the front. It's about 10 thousandths of an inch. I checked the hub before the rotor was slid on and its .004". Any ideas about how to get to .002 or less. Thanks
Be the first to like this post
Sign In to Like this post
Sign In to Like this post
SPONSOR AD:: (Our Sponsors help support Vette Registry)
V
Former Member
Send PMMounds View, MN - USA
Joined: 5/24/2007
Posts: 1034
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
Sometimes you can re-clock the rotor on the hub, and find a place where the run out cancels each other. If not, the "correct" way is to take the hub off, and have everything trued on a lathe, then riveted.
Larry
Larry
Be the first to like this post
Sign In to Like this post
Sign In to Like this post
Lifetime Member
Moderator
Send PMModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22720
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
Yep...sometimes you can simply install the rotor in a different orientation on the hub, and lessen the run-out. You have 5 different ways to try! Make SURE the hub is completely clean of any rust, or anything else that could keep the rotor from seating properly...just a wee bit of dirt can do it. Also, when checking the run-out, make sure the rotor is properly fastened to the hub with ALL of the lug nuts.
You can also use thin brass shim material to make shims, if needed, as a last resort, if you don't want to, or can't have the assembly trued on a lathe.
You can also use thin brass shim material to make shims, if needed, as a last resort, if you don't want to, or can't have the assembly trued on a lathe.

Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Be the first to like this post
Sign In to Like this post
Sign In to Like this post
Is it only one rotor on the front or both? You could try swapping rotors.
If you have .004" on the hub, that could result in .010" on the rotor, just because of the difference in radius.
The best result will be if the hub is turned to eliminate the runout.


Save the Wave!
Support the National Corvette Museum
Support the National Corvette Museum
Be the first to like this post
Sign In to Like this post
Sign In to Like this post
s
These rotors are slotted an can not me turned. They are also directional and can't be switch left to right. Only one of the rotors is out of spec. Has anyone had any experience with turning just the hub.
Be the first to like this post
Sign In to Like this post
Sign In to Like this post
With some of the new cars the runout is so picky that the mfgs make a shim kit. The shims are slightly tapered and fit between the hub and rotor to correct the runout. Im not sure if one of the sets will fit a C3 bolt pattern.
Be the first to like this post
Sign In to Like this post
Sign In to Like this post
s
Hey guys,
I picked up some tapered shim material (.002-.001) from NAPA. I placed shims behind 3 studs and got the run out to within .001. I was amazed at how well it worked. The brakes are back on and everything seems to be working.
I picked up some tapered shim material (.002-.001) from NAPA. I placed shims behind 3 studs and got the run out to within .001. I was amazed at how well it worked. The brakes are back on and everything seems to be working.
Be the first to like this post
Sign In to Like this post
Sign In to Like this post
Lifetime Member
Moderator
Send PMModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22720
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas

Glad ya got it done!

Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Be the first to like this post
Sign In to Like this post
Sign In to Like this post
in Forum: C3 Engines, Driveline and Handling
Sponsored Content