Though an objectively awesome car by any (non-environmental) metric (review forthcoming, I promise) some Corvette ZR1 owners are plagued with a strange brake vibration. Which, thanks to the Corvette Forum, is available for all and sundry to see. But let’s dig a little deeper: bearing in mind the customer involved is a personal friend, and his paraphrased comments are as follows.
I picked up my new ZR1 on Oct 29 and as soon as I got up to 75 the steering wheel began to vibrate…I then took the car straight to the only person on this earth I feel good about working on my corvette, Danny Popp at McKluskey Chev in Cincinatti OH. Pulled wheels and all balanced 0 on Hunter balancer.
In simple English, the diagnosis made it clear that the Michelin tires are not the problem. The next diagnosis goes one step further: Brembo rotors.
Unhappy, scratched head, went back to Danny. Pulled rotors and stuck them on balancer and they were out 1.5 oz!
An imbalance of that size, on a car with such little un-sprung weight at the (ceramic) rotors can be a significant problem. The solution?
We then balanced my carbon rotors by inserting bolts from the inside out and then threading on nuts from the outside with a set of long pliers. Put them back on car and took it out and OMG for the first time since owning the car the highway ride was dead smooth. So happy I want back and hugged Danny. Mystery solved. Now for the permanent fix which obviously should be new (balanced) rotors and should only be a phone call away for a new 120 k vibrating car. (Or even a vibrating cobalt for that matter)
But then again, that often leads to another problem: Customer Service, or lack thereof:
GMs first reply was that they know about the problem and the fix is to counterbalance the assembly by adding 1.5 to the wheels and indexing them so if removed they could be placed back in same location. Bull$&@#!
But wait, there’s more:
Danny had to work his way up the food chain until he got to talk to a brake engineer who basically admitted that they had run out of the supply of “Validated” i.e. balanced rotors and at some point had begun to put on non-validated rotors but that he would immediately send me out a set of validated and balanced rotors which he did.
Which, of course, gets a customer thinking:
I have mine and I am happy, but I hate to think about how many man hours are spent by customers like myself who are taking time off figuring this out and getting it fixed while GM knows about the issue and is still putting these S#%t rotors on their flagship car. I have lost serious loyalty and faith in GM on this one. They need to come clean now and do a recall on these.
Tru dat. A recall is the only way, even if the problem comes from Brembo, not GM. Read towards the end of the thread, and we find the real problem: the major flaw in GM’s customer service. The following is taken from the Corvette specialist who worked on the ZR1 in question:
I have gone through all of the GM protocol to fix this car properly and GM is interested in fixing his and all Corvette owners problems correctly. They are very aware of current situations more than you know…..they may even know about this particular thread (ask me how I know ;-) ).
If GM knows, why doesn’t the person associated with the Corvette brand post on the Forum on their behalf? Is silence really a smart PR move in the Internet age?
New in stock rotors have balance potential from Brembo and in speaking with GM they are deriving a procedure to check and balance rotors for cars that have this problem in the field. They are feverishly working on the protocol for this. This is obviously not a GM manufactured component; they have worked with the supplier to have this not happen from here in the future.
In fairness to GM, we must consider these are not commonplace GM parts. Who else had the stones to put these on a mass-produced vehicle as standard equipment? Then again, that isn’t our beef.
For those of you who have these problems and are frustrated, please contact your dealer and have them address your concerns and involve technical assistance. On that note all dealers are not created equally and every dealer my not have a Corvette only specialist that may be as involved as I.
So where you buy a six-figure Corvette ZR1 isn’t necessarily the same place it should receive service. And now would be a good time to make a significant donation to the Corvette Forum, ‘natch. Which doesn’t speak well of any Chevy dealer lacking a Corvette specialist, if we had a list of said dealers. And while I once disagreed with RF’s way-back-when comment about the Corvette’s relevance to Chevrolet…
“At some point in the near future, as soon as we can, the Corvette will rejoin GM’s fleet as a Cadillac. It will be a different car, with the same goal: to give enthusiasts the world’s best and most thrilling sports car, bar none. An all-American product.”
…honestly, a low volume niche car like the Corvette ZR1 deserves a more worthy customer experience. Perhaps Cadillac dealers should be the only retail distributors of the Corvette brand, as we can assume superior service comes with The Penalty Of Leadership.
And with that thought, back to you, Best and Brightest.