Possible brake pad drag? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

GCFSA · 06-26-2021, 03:55 AM

Hi guys, so I recently installed the AP racing sprint BBK and everything seemed fine for the past week or so, swapped to new ferodo ds1.11 pads for an upcoming track day and was driving it around today and noticed a low rumbling/humming sort of sound when going around 60-80km/h.

Could've been the road or just my imagination but after coming off the freeway I put my hand on the caliper/lug nuts and the driver's side (RHD) was definitly hotter than the left, don't think it was a huge amount (wasn't like one side was cold and the other was smoking, but don't have a temp gun so who knows).

Couldn't smell the brakes, the car wasn't pulling to one side when driving and it didn't feel like the car was low on power or anything.

What could be causing the right side to be hotter than the left? I do have the HKS fender mount oil cooler but I doubt that would make it that much hotter. Put the car on stands and I could rotate both wheels and they felt the same. Is there a possible issue with the brakes or could the new pads be a little too thick/needs to break in a bit?

bcj · 06-26-2021, 10:39 AM

One easy thing to check is runout on the disk.
A bit of warp might do that.

soundman98 · 06-26-2021, 02:42 PM

did you properly bed the pads?

humfrz · 06-26-2021, 11:09 PM

Could be a caliper is sticking -

GCFSA · 06-28-2021, 03:33 AM

just an update, bedded the pads, the noise and vibrations seemed to be reduced quite a bit. After that drove the next day and noticed a very small amount of noise still. Reseat the pads (retracted pistons fully, put wheels on then pumped brakes).

Thought that the noise may have partially been due to the disc not seating properly because maybe one side of the pads were pushing more on the disc than the other if that makes sense?

Anyways, the noise is pretty much gone now, no longer feel one side of the caliper/wheel is hotter than the other

06-26-2021, 03:55 AM	#1
GCFSA Member Join Date: Apr 2018 Drives: Toyota 86 Location: Melbourne Posts: 16 Thanks: 3 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Possible brake pad drag? Hi guys, so I recently installed the AP racing sprint BBK and everything seemed fine for the past week or so, swapped to new ferodo ds1.11 pads for an upcoming track day and was driving it around today and noticed a low rumbling/humming sort of sound when going around 60-80km/h. Could've been the road or just my imagination but after coming off the freeway I put my hand on the caliper/lug nuts and the driver's side (RHD) was definitly hotter than the left, don't think it was a huge amount (wasn't like one side was cold and the other was smoking, but don't have a temp gun so who knows). Couldn't smell the brakes, the car wasn't pulling to one side when driving and it didn't feel like the car was low on power or anything. What could be causing the right side to be hotter than the left? I do have the HKS fender mount oil cooler but I doubt that would make it that much hotter. Put the car on stands and I could rotate both wheels and they felt the same. Is there a possible issue with the brakes or could the new pads be a little too thick/needs to break in a bit?

06-26-2021, 02:42 PM	#3
soundman98 ProCrastinationConsultant Join Date: Sep 2013 Drives: '14 Ranger, '18 Tacoma 4Dr LB Location: chicago-ish Posts: 11,330 Thanks: 35,240 Thanked 13,673 Times in 6,781 Posts Mentioned: 98 Post(s) Tagged: 0 Thread(s)	did you properly bed the pads? __________________ "The time you enjoy wasting is not wasted time"

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06-26-2021, 11:09 PM	#4
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 29,866 Thanks: 28,787 Thanked 31,813 Times in 16,424 Posts Mentioned: 708 Post(s) Tagged: 2 Thread(s)	Could be a caliper is sticking -

06-28-2021, 03:33 AM	#5
GCFSA Member Join Date: Apr 2018 Drives: Toyota 86 Location: Melbourne Posts: 16 Thanks: 3 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	just an update, bedded the pads, the noise and vibrations seemed to be reduced quite a bit. After that drove the next day and noticed a very small amount of noise still. Reseat the pads (retracted pistons fully, put wheels on then pumped brakes). Thought that the noise may have partially been due to the disc not seating properly because maybe one side of the pads were pushing more on the disc than the other if that makes sense? Anyways, the noise is pretty much gone now, no longer feel one side of the caliper/wheel is hotter than the other

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