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Cant seem to find 0.009 rotor shims anywhere. Only seem to be 0.003 and 0.006 shims available now from NAPA or Rockauto?
My runout is originating from my front hubs so even after fitting new bearings i still only manage 0.014 at best at the rotor edge so a 0.006 will only bring me down to 0.008 runout.
To be honest, i had 0.020 before, and had no spongy pedal after 1500 miles so not sure how critical it is to get runout to 0.005 to avoid pulling in air past lip seals?
I know O rings are an option but dont want to go this way unless i have to.
I think we all get a little hung up on trying to get runout so minimal. I really dont think its necessary to get down to 0.005. Although im no expert 😉
0.014" runout at the rotor edge isn't the measurement for the shim you meed. Try measuring at the outer edge of the hub instead of the outer edge of the rotor. That'll get you the measurement you need for the shim.
0.014" runout at the rotor edge isn't the measurement for the shim you meed. Try measuring at the outer edge of the hub instead of the outer edge of the rotor. That'll get you the measurement you need for the shim.
That is actually incorrect.
Although the shim fits behind the hub, a shim marked 0.006 is designed to correct rotor runout of 0.006.
Last edited by Nosheruk; Dec 14, 2019 at 01:15 PM.
Cant seem to find 0.009 rotor shims anywhere. Only seem to be 0.003 and 0.006 shims available now from NAPA or Rockauto?
My runout is originating from my front hubs so even after fitting new bearings i still only manage 0.014 at best at the rotor edge so a 0.006 will only bring me down to 0.008 runout.
To be honest, i had 0.020 before, and had no spongy pedal after 1500 miles so not sure how critical it is to get runout to 0.005 to avoid pulling in air past lip seals?
I know O rings are an option but dont want to go this way unless i have to.
I think we all get a little hung up on trying to get runout so minimal. I really dont think its necessary to get down to 0.005. Although im no expert 😉
Thoughts?
Thanks
Obviously less runout is better. If your terribly worried about it you could take your hubs to a local machine shop and have them trued up. Would run less than $100 if everything is way outta wack.
I’m assuming your rotors are not riveted to the hubs anymore.
Did you try rotating the orientation of the hub and rotor to see if you can zero it out more that way?
Also make sure that your rotors are seating on the hub all the way. If these are older rotors it’s not uncommon for alittle rust on the fins to catch on the hub and screw stuff up.
did you try moving the hub/rotor around on the studs to see
Obviously less runout is better. If your terribly worried about it you could take your hubs to a local machine shop and have them trued up. Would run less than $100 if everything is way outta wack.
I’m assuming your rotors are not riveted to the hubs anymore.
Did you try rotating the orientation of the hub and rotor to see if you can zero it out more that way?
Also make sure that your rotors are seating on the hub all the way. If these are older rotors it’s not uncommon for alittle rust on the fins to catch on the hub and screw stuff up.
did you try moving the hub/rotor around on the studs to see
Yes mate. Did all that thanks.
My rotors are not the originals. I have also cleaned up the faces and deburred the old rivet holes on the hubs.
Those readings were the best i got.
Im not too worried as i gather most hubs had runout hence the machining of hub/rotors together.
I have seen various comments saying that hub runout of 0.010 is not uncommon.
I have ordered new rotors and a few shims and will try these first.
So my new rotors and shims turned up today. My new rotors are perfect so no runout at all on these so i just needed to allow for the hub runout. 0.010 at the hub giving 0.020 at the rotor. I stacked a 0.003 and a 0.006 and this only brought me down to 0.010 as i suspected. Simple answer was to relpace shims with beer cans as suggested. This got me down to 0.003 😁
Last edited by Nosheruk; Dec 17, 2019 at 03:58 PM.
Front hub/rotor Runout
