Break squeal
Safety Car
Joined: Nov 1999
Posts: 4,294
Likes: 1,166
From: Green and Wet Western Oregon
2023 C7 of the Year Winner - Unmodified
2018 C6 of Year Winner
Two things come to mind.
If most of your driving is around town with lower speeds and light braking, the brake pads could be glazed. Take it out to a nice country road, get up to 45-50 mph and brake hard. Do that a couple of times and see if the rear brakes still squeal.
Do you drive on any gravel roads? Could be a small rock stuck in a brake caliper.
If most of your driving is around town with lower speeds and light braking, the brake pads could be glazed. Take it out to a nice country road, get up to 45-50 mph and brake hard. Do that a couple of times and see if the rear brakes still squeal.
Do you drive on any gravel roads? Could be a small rock stuck in a brake caliper.
Last edited by duckvett; Mar 14, 2020 at 11:19 AM.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,106
Likes: 12,446
From: NE South Carolina
^^^
Yep performance brakes need to be used aggressively from time so there is not an irregular build-up of pad materials on the rotors. It's very thin, NOT something you would see. It causes slip-stick friction, vibration and squeal.
My experience with my 2014 Z51 having babied the brakes was at ~1000 miles had a slow speed stop squeal like a stuck pig! Bedded the pads using a procedure outlined in the Owner's Manual for Tracking. GM calls it burnishing! NOT their suggested 25 stop procedure, 5 or 6 should do it. As they note, don't go to zero speed. Stop hard from ~60 mph, as you note, to about 15 mph. Key is to find a safe space. My squeal was gone.
Yep performance brakes need to be used aggressively from time so there is not an irregular build-up of pad materials on the rotors. It's very thin, NOT something you would see. It causes slip-stick friction, vibration and squeal.
My experience with my 2014 Z51 having babied the brakes was at ~1000 miles had a slow speed stop squeal like a stuck pig! Bedded the pads using a procedure outlined in the Owner's Manual for Tracking. GM calls it burnishing! NOT their suggested 25 stop procedure, 5 or 6 should do it. As they note, don't go to zero speed. Stop hard from ~60 mph, as you note, to about 15 mph. Key is to find a safe space. My squeal was gone.
Last edited by JerryU; Mar 14, 2020 at 12:56 PM.
Thread Starter
Instructor
Joined: Feb 2018
Posts: 155
Likes: 29
From: Katy TEXAS
^^^
Yep performance brakes need to be used aggressively from time so there is not an irregular build-up of pad materials on the rotors. It's very thin, NOT something you would see. It causes slip-stick friction, vibration and squeal.
My experience with my 2014 Z51 having babied the brakes was at ~1000 miles had a slow speed stop squeal like a stuck pig! Bedded the pads using a procedure outlined in the Owner's Manual for Tracking. GM calls it burnishing! NOT their suggested 25 stop procedure, 5 or 6 should do it. As they note, don't go to zero speed. Stop hard from ~60 mph, as you note, to about 15 mph. Key is to find a safe space. My squeal was gone.
Yep performance brakes need to be used aggressively from time so there is not an irregular build-up of pad materials on the rotors. It's very thin, NOT something you would see. It causes slip-stick friction, vibration and squeal.
My experience with my 2014 Z51 having babied the brakes was at ~1000 miles had a slow speed stop squeal like a stuck pig! Bedded the pads using a procedure outlined in the Owner's Manual for Tracking. GM calls it burnishing! NOT their suggested 25 stop procedure, 5 or 6 should do it. As they note, don't go to zero speed. Stop hard from ~60 mph, as you note, to about 15 mph. Key is to find a safe space. My squeal was gone.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,106
Likes: 12,446
From: NE South Carolina
^^^
Look at the Owner's Manual and follow what they say BUT for 5 or 6 times NOT 25! If it doesn't go way some dealers were putting lub on the pad edges. Some report it helps for a while. But dealers get paid nothing for Bedding! In fact they won't drive your car to do it! But on warranty they get paid by GM to put lub on the pad edges!
Look at the Owner's Manual and follow what they say BUT for 5 or 6 times NOT 25! If it doesn't go way some dealers were putting lub on the pad edges. Some report it helps for a while. But dealers get paid nothing for Bedding! In fact they won't drive your car to do it! But on warranty they get paid by GM to put lub on the pad edges!
Last edited by JerryU; Mar 14, 2020 at 02:10 PM.
