Probably to stop corrosion between dissimilar metals at a guess. Alloys on high carbon discs can corrode.
I don’t think it is, but is that a floating disc(rotor)?
I don’t think it is, but is that a floating disc(rotor)?
-
EV6 Reservation Tracker: Add Yours Here!
Shim? What purpose does this serve
1 - 9 of 9 Posts
Yes it looks like it's a floating design.Probably to stop corrosion between dissimilar metals at a guess. Alloys on high carbon discs can corrode.
I don’t think it is, but is that a floating disc(rotor)?
Those shims remind me of the shims behind disc brake pads on my old RWD Volvos. We added an MoS2 paste between shim and pad, until the shims started coming with pre-applied coating similar to what's shown on these shims. It addressed brake squeal by providing a thin compliant layer.
However, the brake pad application put the layer in the path of maximum pressure. Alloy wheels usually have a void between lug nut/bolt bosses where this compound is found. It would be interesting to see how this pattern contacts the wheel... but my money is on noise reduction of some sort.
However, the brake pad application put the layer in the path of maximum pressure. Alloy wheels usually have a void between lug nut/bolt bosses where this compound is found. It would be interesting to see how this pattern contacts the wheel... but my money is on noise reduction of some sort.
That spacer looks a lot like the backing plate found on the pads that fbov mentioned. I've been doing brakes for over 30 years, and those spacers were always identified for sound deadening (usually along with some silicone grease).
Related, I've had multiple experiences where the wheel bonds to the rotor (or even drum, for older brakes). Along this line, most early rotors included a threaded hole that you could drive a bolt into in order to 'release' the rotor from the hub - 2 large, flat surfaces, so it didn't take much for them to bond together. This (and wheel-to-rotor bonding) is easy to overcome with some never-seize, or other corrosion preventive spray.
Because of that, my money is also on sound deadening.
Related, I've had multiple experiences where the wheel bonds to the rotor (or even drum, for older brakes). Along this line, most early rotors included a threaded hole that you could drive a bolt into in order to 'release' the rotor from the hub - 2 large, flat surfaces, so it didn't take much for them to bond together. This (and wheel-to-rotor bonding) is easy to overcome with some never-seize, or other corrosion preventive spray.
Because of that, my money is also on sound deadening.
This was common when I was using steel wheels in the winter, but it was the center hole clearance that held it. The hub surface wasn't bonded at all....I've had multiple experiences where the wheel bonds to the rotor (or even drum, for older brakes). Along this line, most early rotors included a threaded hole
In my Volvos, that threaded hole was filled with a pin that fit in a hole in the wheel, indexingthe wheel to the rotor.
I wouldn't discount anti corrosion. Spacer is much much simpler to employ in the field and much less messy as well.That spacer looks a lot like the backing plate found on the pads that fbov mentioned. I've been doing brakes for over 30 years, and those spacers were always identified for sound deadening (usually along with some silicone grease).
Related, I've had multiple experiences where the wheel bonds to the rotor (or even drum, for older brakes). Along this line, most early rotors included a threaded hole that you could drive a bolt into in order to 'release' the rotor from the hub - 2 large, flat surfaces, so it didn't take much for them to bond together. This (and wheel-to-rotor bonding) is easy to overcome with some never-seize, or other corrosion preventive spray.
Because of that, my money is also on sound deadening.
Sent from my Pixel 3a using Tapatalk
That looks like a spacer to me, potentially something was just a bit out of spec causing some part on part interference and they used these shims to compensate
are they on all 4 corners?
are they on all 4 corners?
They are on front wheels on GT, been on both GT's I have had access to. They are not a shim for clearance, there is plenty of clearance with or without them.
1 - 9 of 9 Posts
Kia EV6 Forum
Register for the latest discussion and news about Kia's upcoming electric vehicles: EV1, EV2, EV3, EV4, EV5, EV6, EV7, EV8, and EV9
Full Forum Listing
Recommended Communities
