Some issues after installing brake pads - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

hpde_addict · 06-14-2015, 02:10 AM

After installing Carbotech XP8, I am noticing these issues:

1. Brake pedal can bottom out

2. Air hissing when pressing brake pedal down

3. Brakes screech, but not evenly

4. Braking force seems good.

These are the steps I went through to install:

1. Remove old brake pads and shims.

2. Installed new brake pads (no shims) snugly into their slots. Needed to compress caliper pistons a bit for them to fit. Checked pads a month ago and they were 10mm front and 8mm rear, so not much compressing.

3. Tightened guide pin bolts lightly with finger tips until flush with caliper and no further movement from light twist. Then applied around 20-30 degrees of rotation to get a snug fit. This was roughly what was needed to apply 19 ft-lbs when I tested with torque wrench.

4. Pumped brake pedal repeatedly after install.

5. Never opened brake fluid reservoir or bled from caliper. Did not replace or resurface rotors because they looked basically new.

Any ideas? Could it just be that I haven't bedded the brake pads and they are not flush yet?

Panman · 06-14-2015, 07:02 AM

You need to bleed your lines, then bed.

hpde_addict · 06-14-2015, 07:15 PM

Quote:

Originally Posted by Panman

You need to bleed your lines, then bed.

Yeah... I'm bleeding and bedding them in a couple days. What should the OEM brake fluid look like? Mine is like this:

06-14-2015, 02:10 AM	#1
hpde_addict Senior Member Join Date: May 2015 Drives: '18 Camaro V6 1LE Location: SF Bay Area Posts: 161 Thanks: 57 Thanked 47 Times in 31 Posts Mentioned: 2 Post(s) Tagged: 2 Thread(s)	Some issues after installing brake pads After installing Carbotech XP8, I am noticing these issues: 1. Brake pedal can bottom out 2. Air hissing when pressing brake pedal down 3. Brakes screech, but not evenly 4. Braking force seems good. These are the steps I went through to install: 1. Remove old brake pads and shims. 2. Installed new brake pads (no shims) snugly into their slots. Needed to compress caliper pistons a bit for them to fit. Checked pads a month ago and they were 10mm front and 8mm rear, so not much compressing. 3. Tightened guide pin bolts lightly with finger tips until flush with caliper and no further movement from light twist. Then applied around 20-30 degrees of rotation to get a snug fit. This was roughly what was needed to apply 19 ft-lbs when I tested with torque wrench. 4. Pumped brake pedal repeatedly after install. 5. Never opened brake fluid reservoir or bled from caliper. Did not replace or resurface rotors because they looked basically new. Any ideas? Could it just be that I haven't bedded the brake pads and they are not flush yet? Last edited by hpde_addict; 06-14-2015 at 04:43 AM.

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06-14-2015, 07:02 AM	#2
Panman Senior Member Join Date: Jun 2012 Drives: 86 GTS Location: Brisbane Australia Posts: 706 Thanks: 141 Thanked 275 Times in 176 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	You need to bleed your lines, then bed.

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