I have a 2017 SVR with the CCBs. I have lowered with VAP springs and added 10mm spacers. Car has about 4k miles on it.

A month after adding the springs and spacers, the brakes began to howl/honk upon a stop about 1/3 of the time. I mention "a month" because the brakes were dead quiet (with our without the mods) until they started making the noise at about 3k mile.. Not the typical high-pitched squeal, but a lower harmonic sounding tone. Dealer's shop manager described it as a finger going around a wine glass phenomenon.

Dealer couldn't figure it out and after consulting with HQ, they replaced all 4 pads. The car was quiet for a few hundred miles, then back to the same howling upon stopping 1/3 of the time. Also, I have never used tire shine on the tires that could have contaminated the rotors. All lug nuts are to spec.

- Coming out of the garage for the first 2 miles - quiet. 100% of the time.
- After things warm up, howling during the last few feet of a stop.
- Very hot brake (100-0 tests), same howling during the last few feet of a stop.
- Hosing off the rotors really well makes things quiet for a few miles, then back to howling for the last few feet of a stop, about 1/3 of every stop.

I temporarily placed stick-on wheel weights on the dust shields and then on the calipers to see if there was a harmonic thing going on, but no changes.

Any thoughts?

 

 

Dealer pulled, inspected, and weighed the rotors. They appear perfect. Sound appears to come from the whole car, not one corner .....
My current theory, until I can come up with something else, is during dealer car washes they used tire dressing that contaminated the rotors.

I'm goin to pull off the spaces next weekend just to make sure they are not exasperating the problem.

 

Figured it out.
It was my 10mm spacers. Although buttoned down correctly (longer lug nuts) and torqued to spec, the front spacers cause a harmonic howl upon braking. Back spacers begin to barely make a harmonic howl noise on the last few feet of braking if you really listen for it. Not concerning.

No front spacers, no howling.

I even tried one at a time.
One front spacer = some howl.
Both front spacers = major howl.

 

Are they just spacers or are they hub-centric adapters?
Although in my view if they don't change the PCD they are simply spacers even if hub-centric and adapters are designed to change the PCD (so you can fit wheels with a different PCD to stock).
Put another way, what do the wheels bolt to, the OEM lugs (ie they are just spacers) or an extra set of lugs on the spacers/adapters?
If the former then I reckon that is the cause of your problem and you should fit proper hub-centric spacers/adapters instead.

 

Simple spacers, not adapters. Hub and wheel centric.

 

The diameter of the spacers is too large. Spacer material is probably extending beyond the flat surface of the hub or the wheel.

 

Maybe I should be a little clearer about spacers vs adapters and lugs vs no lugs.
Hub centric spacers, no lugs: https://www.ebay.com.au/itm/SPP-5mm-...MAAOSwnHZYgXVN
Hub centric spacers/adapters with lugs: https://www.aliexpress.com/item/Alum...2-c19820e34402
These are the exact same ones I have on the F-Type and they have caused zero problems, but I have read about many problems caused by "pure" spacers with no lugs as per the first link above.

 

Negative. Perfect match.

 

So if I want to try adapters rather than the hub /wheel centric spacers on my 2017 SVR with the CCB package, what am I looking for? Keep in mind I have the wider OEM tires....... I also have VAP lowering springs.

 

Most have found with the 305 tyres on the back and the 265 on the front (I guess that's what you have, they are 10 mm wider than the R tyres but the stock sizes on the SVR) and with VAP springs that 10 mm spacers is about the max you can go and still avoid rubbing/scraping. You might get away with 15 mm but it would be a risk, you can always try the ones I linked to then on-sell them if they are too wide as they are reasonably cheap to start with.
10 mm hub centric with lugs are fairly rare in the Jag 5x108 PCD but you might get lucky on Fleabay and I'm fairly sure there are suppliers out there that custom make them to your specs for not too many $.

 

Yes, 10mm in front is perfect
Rear appears to be able to handle perhaps 15mm as 10mm left some space.
Wish I could edit the title of this thread, now that I know it's not the CCBs howling.

Has anyone on the forum with an SVR/CCBs and VAP springs used wheel adapters?