Squeaky brakes
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It's a common issue with the Z51 brakes. There is a service bulletin on it, so take it to your dealer and he should be able to fix you up.
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Marcello, like Gregg posted take it to your Chevrolet service department and they will get your C7 squared away. I remember awhile back it was GM Bulletin PI0917B, but it may have been updated. Post the results after you have the problem corrected.
SF
Rick
SF
Rick
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305 Posts
Nothing wrong with new pads
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marmar, it reads like you will get your C7 squared away, good deal. That is one reason I like this forum so much, outstanding members sharing knowledge!! I've learned more from forum members than any book or magazine could teach me. So the knowledge I've learned from fellow Vette owners, I also can pass it down to future Vette owners.
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Rick
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631 Posts
Bedding pads is more important than most realize, and then performance pads can still be noisy. Most now chamber the leading edges and have anti-squeal material between the caliper and rotor to absorb the resonance that you here. May be as simple as a glaze on the rotors that needs to be cut. The dealer should ALWAYS be aware of TSB's....they can pull them all up with a few key strokes. Any with a good competent service department, especially those that service the C7 should be aware.
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4,198 Posts
marmar,
My apologies regarding your squeaky brakes. Although I understand your displeasure, it's great that you've proactively reached out to your dealer for an official diagnosis. Keep us in the loop and updated on your service visit. If necessary, I can contact the dealer's Customer Experience Managers if you have additional questions. We'll look forward to your updates
.William R.
Chevrolet Customer Care
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18,694 Posts
Most there is not a new for new rotors nor brakes at your mileage, but having them properly clean the rotors. Of course there are exception, and would suggest when you make an appointment (sorry about your new problem), you advise them about the TSB number.
Good luck, and hope this is your last issues.
At the same time, as also noted above, high performance brakes can intermittently squeal. Mine will do it about once a month, using when I am slowing applying the brakes for gentle slowing, and only during the last few feet. It is annoying, but once a month, even us humans can getting cranky that often.
Good luck, and hope this is your last issues.
At the same time, as also noted above, high performance brakes can intermittently squeal. Mine will do it about once a month, using when I am slowing applying the brakes for gentle slowing, and only during the last few feet. It is annoying, but once a month, even us humans can getting cranky that often.
I have the non z brakes. Early summer I experienced squeeling brakes while backing out of garage after sitting over night. I happened to take my gkids on a little autocross in a school parking lot-- going fast a d then applying brakes really hard. Problem solved! I'll see what happens after the winter rest.
This was my experiance, FWIW. Treated my brakes as recommended for break-in. At perhaps 1000 miles they periodically squeeled like a stuck pig on slow speed stops. Was very loud. Following some forum advise and some prior experiance with other cars, bedded the brakes. (You can google to see what that is about, but especially for high performance pads you need to get some pad material uniformly on the rotors. That is accomplished by heating the pads near their max operating temperature and then allow them to slow cool.)
Bedding solved the issue and the noise was gone for the year I had the OEM pads before switching to Carbotech 1521's to eliminate the dust. Bedded those pads when I put them on.
This is the bedding proceedure for the Z51 OEM pads: Find a safe road; go 60 mph; apply the brakes hard (not so hard as to energize the antilock brakes, about 85% of max). At 20 mph accelerate back to 60 mph within about 2 minutes hit the brakes again to 20 mph. Repeat 5 or 6 times. Then drive for about 15 to 30 minutes without using the brakes to let them cool. Do not stop.
As mentioned, the most difficult thing to do if find roads where you can do it safely. I live off of an often lightly traveled 4 lane highway with a long streach before an interstate. Did the 60 mph to 20 mph stops on it then without braking got on the interstate and let them cool. Good luck.
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the dealer wants to replace them so they can get money from GM for the easy cake job work done to replace them. $$$$$ cha ching $$$$$$
I agree, dealers get paid to put grease on the pad edges or replace them with warrety money from GM. A number of folks have said it only lasts a short time and comes back! Recently read with performance pads you need to periodically use the brakes aggressively to keep a uniform friction surface on the rotors. I have a few 90 degree stops where do use high "g" force stops before turning.
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So, here is something I have done on another car to bed the brakes. Does anyone (Mark, Jerry, others) see a problem with doing this?
Instead of breaking hard like all of the brake pad bedding instructions say, just drive down the road at a constant speed (in the 35-50 MPH range) and apply the brake about 10-15% with the left foot while maintaining a little more gas with the right foot to keep the speed up. Do this for a minute or so with the window rolled down and only release the brake after the brakes start to smell. Then drive normally (55 MPH) for 15 minutes or so without using the brakes to let them cool.
Isn't this better than the standard bedding instructions? It lets people maintain a safer driving environment instead of rapidly decelerating over and over, it seems to me as if it would not be as hard on the brake lines, and it is easier than trying to count "How many times have I done this, and how many more do I need to do?"
Mechanically-knowledgeable guys, what am I missing here?
Instead of breaking hard like all of the brake pad bedding instructions say, just drive down the road at a constant speed (in the 35-50 MPH range) and apply the brake about 10-15% with the left foot while maintaining a little more gas with the right foot to keep the speed up. Do this for a minute or so with the window rolled down and only release the brake after the brakes start to smell. Then drive normally (55 MPH) for 15 minutes or so without using the brakes to let them cool.
Isn't this better than the standard bedding instructions? It lets people maintain a safer driving environment instead of rapidly decelerating over and over, it seems to me as if it would not be as hard on the brake lines, and it is easier than trying to count "How many times have I done this, and how many more do I need to do?"
Mechanically-knowledgeable guys, what am I missing here?
ln theory, guess you could get the rotors up to temperature that way. Also assume some pad material would transfer to them when they are hot. But would it be the same as hard contact? I assume the bulk of the pad transfer would occur on the last few stops of the normal procedure.
In practice, not sure how you could define you were at the proper temperature. Carbotech, for example, has different speeds they recommend for race pads and the 1521 street ceramic pads to achieve the desired temperatures needed for bedding. Assume they have conducted the tests to define the speeds and number of stops needed. For example Adam, who sells Carbotech pads and is a forum advertiser, recently posted that Carbotech found some users were overheating the pads during bedding. Compared to the suggestions for the OEM Z51 pads their suggestions for 1521's were to go from 60 to 30 mph with fewer repeats.
Guess for the OEM pads I would say if your dragging the brakes approach with perhaps one final 60 to 20 mph hard final stop works to eliminate brake noise, it is fine. Certainly it is easier to accomplish safely. Just my thought.
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Thank you for your input, Jerry!
By the way, when doing this before, I maybe used more than 10-15% pressure on the brakes. I just do what feels like it is offering enough friction to heat and transfer material. Doing this has also taken care of a slight "pulsing" feel I had when using the brakes.
By the way, when doing this before, I maybe used more than 10-15% pressure on the brakes. I just do what feels like it is offering enough friction to heat and transfer material. Doing this has also taken care of a slight "pulsing" feel I had when using the brakes.
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269 Posts
It was 65degF in Fort Wayne today, so I took white knuckles (2014 Z51 with performance package) out from winter hibernation. Wife was with me for quick errands around town. Experienced the horrible brake shriek during braking at slow stops.
Read through the forum, will be trying the brake bedding as a cure during next good weather.
Any other advice appreciated.
Read through the forum, will be trying the brake bedding as a cure during next good weather.
Any other advice appreciated.
Exactly my experience too. Only while backing out of the driveway in the morning or after it's sat for most of the day at work. A little aggressive braking got rid of it.
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