Grinding From Rear Brakes after Pad/Rotor Change - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

JemSS · 12-13-2016, 07:33 PM

I recently swapped out the stock brake pads and rotors with drilled/slotted rotors from Power Stop, along with new ceramic/carbon pads.

I noticed some noise for the first few miles, but nothing major - assumed it was just the brake pads and rotors "breaking in".

However, the noises were much worse the second time I took the car out. The sound is now a loud grinding sound that appears to be coming from the rear passenger brake. It sounds very similar to a car that needs new brakes.

Also, the sound is present when taking off from a stop, but appears to go away once you reach 15-20mph (this is most noticeable after coming to a complete stop).

No visual issue with the rotor
Sound happens when using the brakes, or when taking off after a full stop
Seems to be less noise after a few miles of driving (hard to confirm as I'm trying to avoid driving a lot as the sound is terrible)

I'm taking everything off again tomorrow to check, but was curious to if there was anything I should look for. This is my first time changing the brakes on this car, so I definitely may have made a rookie mistake.

KillboyPowerhead · 12-14-2016, 04:27 AM

Kind of sounds like the caliper pistons aren't retracting so the pad(s) stay sitting against the rotor instead of moving back off of the rotor - could the calipers have been damaged during install? Each piston has a small rubber o-ring-like thing which retracts the pistons after use, so maybe one of these got cut?. Maybe look to see if one of the pads is worn a bit more than the others; also make sure the rotors and pads are all sitting square to the hub/each other; and if everything appears fine, you could try a pad-bedding procedure.

maxxsmoke · 12-15-2016, 07:31 AM

Quote:

Originally Posted by KillboyPowerhead

Kind of sounds like the caliper pistons aren't retracting so the pad(s) stay sitting against the rotor instead of moving back off of the rotor - could the calipers have been damaged during install? Each piston has a small rubber o-ring-like thing which retracts the pistons after use, so maybe one of these got cut?. Maybe look to see if one of the pads is worn a bit more than the others; also make sure the rotors and pads are all sitting square to the hub/each other; and if everything appears fine, you could try a pad-bedding procedure.

eh no. that's not how disk brakes work the are in fact made to retain pressure to keep pads in light contact when not applied. check with the rotor manufacturer they might have an issue with a burr on the cross drill holes

JOHNSONROD · 12-15-2016, 01:11 PM

it sounds silly but ive seen pads put in backwards before. it will do exactly what your describing.

KillboyPowerhead · 12-15-2016, 01:27 PM

Quote:

Originally Posted by maxxsmoke

eh no. that's not how disk brakes work the are in fact made to retain pressure to keep pads in light contact when not applied. check with the rotor manufacturer they might have an issue with a burr on the cross drill holes

eh yes. that is how disk brakes work.

Mr. Stacy · 12-15-2016, 01:53 PM

The pads always stay in light contact with the rotor...

KillboyPowerhead · 12-15-2016, 02:00 PM

The pads will maintain light contact but the pistons retract ever so slightly so as to relieve any (most of the) pressure from the pads against the rotor; if the pistons stayed in the after-use position there would still be some braking force present (for a short amount of time) and the pads would wear much quicker.

12-13-2016, 07:33 PM	#1
JemSS Drives: 2010 Camaro 2SS/RS, 1993 Camaro Z28 Join Date: Dec 2012 Location: Tucson, AZ Posts: 22	Grinding From Rear Brakes after Pad/Rotor Change I recently swapped out the stock brake pads and rotors with drilled/slotted rotors from Power Stop, along with new ceramic/carbon pads. I noticed some noise for the first few miles, but nothing major - assumed it was just the brake pads and rotors "breaking in". However, the noises were much worse the second time I took the car out. The sound is now a loud grinding sound that appears to be coming from the rear passenger brake. It sounds very similar to a car that needs new brakes. Also, the sound is present when taking off from a stop, but appears to go away once you reach 15-20mph (this is most noticeable after coming to a complete stop). No visual issue with the rotor Sound happens when using the brakes, or when taking off after a full stop Seems to be less noise after a few miles of driving (hard to confirm as I'm trying to avoid driving a lot as the sound is terrible) I'm taking everything off again tomorrow to check, but was curious to if there was anything I should look for. This is my first time changing the brakes on this car, so I definitely may have made a rookie mistake.

12-15-2016, 01:53 PM	#6
Mr. Stacy El Duderino Drives: 2011 2LTRS Convertible Join Date: Jan 2016 Location: Seattle Posts: 2,194 View My Garage	The pads always stay in light contact with the rotor... __________________ I bowl. Drive around. The occasional acid flashback.

12-14-2016, 04:27 AM	#2
KillboyPowerhead Drives: 2015 Z/22 Join Date: Aug 2015 Location: Ontario, Canada Posts: 930	Kind of sounds like the caliper pistons aren't retracting so the pad(s) stay sitting against the rotor instead of moving back off of the rotor - could the calipers have been damaged during install? Each piston has a small rubber o-ring-like thing which retracts the pistons after use, so maybe one of these got cut?. Maybe look to see if one of the pads is worn a bit more than the others; also make sure the rotors and pads are all sitting square to the hub/each other; and if everything appears fine, you could try a pad-bedding procedure.

12-15-2016, 01:11 PM	#4
JOHNSONROD Drives: 62 Chevy & 2021 1SS/1LE manual Join Date: Aug 2010 Location: Kentucky Posts: 893	it sounds silly but ive seen pads put in backwards before. it will do exactly what your describing.

12-15-2016, 02:00 PM	#7
KillboyPowerhead Drives: 2015 Z/22 Join Date: Aug 2015 Location: Ontario, Canada Posts: 930	The pads will maintain light contact but the pistons retract ever so slightly so as to relieve any (most of the) pressure from the pads against the rotor; if the pistons stayed in the after-use position there would still be some braking force present (for a short amount of time) and the pads would wear much quicker.