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Hello All,
A few weeks ago I replaced my brake rotors and pads with supplies from R1Concepts. I started to notice what seems like to be a screech/scrape sound from the front driver's side on occasion when I am returning to driving after using the brakes. The sound only occurs roughly from 0-20mph and is not consistent, and you can hear it only from that mph range, so it is not increasing with speed etc so I have ruled out the axle or wheel bearings (from my limited knowledge).
I am assuming it is from the brake system and maybe I over tightened or something...? or I didn't add grease to the right parts?
Since I am assuming its related to the bolts, does anyone know the torque specs for installation on the bolts I removed from the vehicle to do the pads and rotors? 2017 Impreza Sport to be exact.
 

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I used 19.9 ft lbs for the caliper bolts (not the bracket mount bolts). That seems to be the torque that most Subaru models use.

To me, it sounds like you have some brake pad drag occurring. Like the pads are staying in light contact with the rotors when the caliper pistons have retracted. This is always a possible occurrence with disk brakes. Maybe the backing plate is a really tight fit in the caliper or something you applied (grease or adhesive) is preventing the pad from freely backing off. That's my long distance guess without seeing and hearing it in person.
 

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Discussion Starter #3
I used 19.9 ft lbs for the caliper bolts (not the bracket mount bolts). That seems to be the torque that most Subaru models use.

To me, it sounds like you have some brake pad drag occurring. Like the pads are staying in light contact with the rotors when the caliper pistons have retracted. This is always a possible occurrence with disk brakes. Maybe the backing plate is a really tight fit in the caliper or something you applied (grease or adhesive) is preventing the pad from freely backing off. That's my long distance guess without seeing and hearing it in person.
Well you put it in good words, far better than I could with my knowledge. Okay, thanks I'll give it a try again with a torque wrench!

If anyone else has possible input I'll take other suggestions too. I've changed brake pads, rotors, and bled lines before, but never had this issue until it was my own car (go figure).
 

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ModFather
2019 Subaru Impreza Sport 5 Dr. Manual Shift
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Rear

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Make sure the caliper bracket to spindle bolt is tight, that keeps the entire assembly from moving, if anything is loose to cause that noise it would be that bolt.

Double check that you didn't bend the brake dust shield, if it is bent it can rub on the rotor, it is thin metal and can bend easily.

Lastly, if the brake pads have more metal content they will squeal and make metal to metal screeching noise. Many aftermarket pads will use higher metal content for performance, but they will screech/squeal more compared to stock.
 

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ModFather
2019 Subaru Impreza Sport 5 Dr. Manual Shift
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Lastly, if the brake pads have more metal content they will squeal and make metal to metal screeching noise. Many aftermarket pads will use higher metal content for performance, but they will screech/squeal more compared to stock.
Even though they say you don't need it, I like to put some CRC Brake Quiet goop on the back of the pads. Helps keep the noise down.
 

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Even though they say you don't need it, I like to put some CRC Brake Quiet goop on the back of the pads. Helps keep the noise down.
oh yeah that helps to reduce squeal from vibrations, but high metal content brake pads will make their own noise - best described as metal to metal screech, two kinds of noise. Anyone who has used Hawk HP+ pads will know what I mean, great for performance but noisy as all hell.
 

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ModFather
2019 Subaru Impreza Sport 5 Dr. Manual Shift
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I just removed the hawk pads on my other car. I suppose it would have been really noisy if I were able to hear it. It's a convertible so everything is noisy :) Hawk pads tend to be aggressive depending on the type you install. At least I got my monies worth! ;)


22984
 

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I just removed the hawk pads on my other car. I suppose it would have been really noisy if I were able to hear it. It's a convertible so everything is noisy :) Hawk pads tend to be aggressive depending on the type you install. At least I got my monies worth! ;)


View attachment 22984
Those pads owe you nothing, lol . I always used Hawk HPS pads on the street, they were very quiet, HP+ were noisier along with their other track pads. Totally normal though.
 

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H

How were you able to get ahold of these?
I'm not peaty, but you can get access to the service manual from the Subaru Technical Information System (STIS). It is $35 for 3 days which is enough time to download a copy of the service manual. It is a bit tedious for the newer Subarus because you have to click through each section. Once you bring up a section, you can print it to PDF to save it for later. On older Subarus, you can download PDFs of each section, and with some models, you could download the whole service manual as one big PDF.
 

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Hello All,
A few weeks ago I replaced my brake rotors and pads with supplies from R1Concepts. I started to notice what seems like to be a screech/scrape sound from the front driver's side on occasion when I am returning to driving after using the brakes. The sound only occurs roughly from 0-20mph and is not consistent, and you can hear it only from that mph range, so it is not increasing with speed etc so I have ruled out the axle or wheel bearings (from my limited knowledge).
I am assuming it is from the brake system and maybe I over tightened or something...? or I didn't add grease to the right parts?
Since I am assuming its related to the bolts, does anyone know the torque specs for installation on the bolts I removed from the vehicle to do the pads and rotors? 2017 Impreza Sport to be exact.
Hey mate
Im a qualified mechanic and have done some subaru brand specific training before it got canned.
I hava a 2017 impreza and have had this noise as if my pads are worn when brakeing moderatly the pads are not worn they are new but i machined my rotors so Im replacing my rotors for dba but ive noticed one of the sliders has a rubber ring on the end of it and it has swollen and is causing that slider to seize so i have removed it. All that rubber thing does is absorb some vibrstion. Ill let you know how i go but i hope this helps
 

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ModFather
2019 Subaru Impreza Sport 5 Dr. Manual Shift
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When I was doing the brakes on the wife's outback, I had the same issue with the rubber guide that sits on the pin. I think the brake cleaner I was using made it swell. I did the same thing and removed it. I did put some synthetic slide grease on it. I haven't had any issues even though I did get a new rubber piece, I never got around to put it in. Haven't had any noise but I did put brake light on the back of those pads too.
 

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Update to previous reply: horrible brake squeel is gone, the rubber had swollen and was seizing the sliders up, i just removed it for now until i go get some replacement ones and some replacement boots because i think the grommet part that goes into the caliper bracket maybe swollen too, ill use bendix brake slider lube in future to avoid issues. Hope this helps someone
 

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ModFather
2019 Subaru Impreza Sport 5 Dr. Manual Shift
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I think it's saying it different depending on the bolt used 17 or 19 mm. I'm just guessing but maybe there are different rotor sizes between models. I think they will be the same upper and lower just one or the other bolt size. Just a guess though.
 

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I think it's saying it different depending on the bolt used 17 or 19 mm. I'm just guessing but maybe there are different rotor sizes between models. I think they will be the same upper and lower just one or the other bolt size. Just a guess though.
Oh I get it, those numbers seem lower than my own findings. Hopefully I didn't over tighten anything lol. I tried asking the dealership and they didn't even know the torque spec so when I went to do my brakes I used a torque wrench on the bolts and went up one notch at a time until it was at the setting where it would click and then one ftlb higher on the setting would turn the bolt slightly without clicking. Also keep in mind my car's breaks have never been touched since buying the car brand new in 2017 so everything should be torqued to factory spec. Heres what I found:

fronts
the two caliper bolts were torqued to 26ftlbs
caliper bracket bolts were torqued to 115ftlbs

Rears
I have not done my rear brakes yet but maybe I'll give an update when I do it.
 
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