Brake issue, sinking pedal after bleeding brakes

parish8 · 03-11-2018, 08:51 PM

I put on the 15”(wheel) rear brake kit and bled the brakes. Now I have a slowly sinking brake pedal when I step on the brakes. It’s not spongy, it is sinking. I went ahead and bled them some more, about 10 cycles per corner and the problem is still there. I never let the fluid get low and there are no leaks.

Any ideas? Seems like a bad master cylinder. Maybe there is a special brake bleeding procedure we need to use?

Burly · 03-12-2018, 05:13 AM

Had my calipers powder coated Friday and I’ve tried all weekend trying to bleed my brakes but it’s still sinking and soft. I give up and calling dealer this morning.

Perdieu · 03-12-2018, 01:24 PM

I have the same issue, but its only when I'm just sitting.
Driving it you can't tell anything is different.

parish8 · 03-12-2018, 01:47 PM

Quote:

Originally Posted by Perdieu

I have the same issue, but its only when I'm just sitting.
Driving it you can't tell anything is different.

I guess I should go drive it.

Burly · 03-12-2018, 01:52 PM

I drove around quite a bit Sunday and its not sinking as bad but definitely not as hard as should be. Got an appointment with dealer tomorrow morning. They "owe" me a service so I hoping I can get this done almost free.

Burly · 03-13-2018, 11:25 AM

Just got back from dealer and back to normal. They just did thier “normal” brake fluid flush procedure. Sorry I didn’t get any more info than that.

bpang1234 · 03-13-2018, 03:15 PM

Yeah sometimes you can get a bubble in there even if you try really hard not to.

parish8 · 03-13-2018, 05:04 PM

I tired the mallet on the caliper trick. Didn’t help at all. Sounds like I need to go through the “automated bleed cycle”. It will be in for an alignment soon, maybe I will just have them do it.

parish8 · 03-14-2018, 08:21 AM

Quote:

Originally Posted by Perdieu

I have the same issue, but its only when I'm just sitting.
Driving it you can't tell anything is different.

I did get to drive my car last night and didn’t notice the issue. Strange.

brettman · 03-14-2018, 08:01 PM

Quote:

Originally Posted by parish8

I did get to drive my car last night and didn’t notice the issue. Strange.

If it comes back, old trick I uses to do years ago. Get a oil pump can, install hose to bleeder, pump fluid caliper up. Used this trick with Harleys and DOT4.

PolynesianPowerhouse · 03-15-2018, 08:33 AM

Something basic that may help http://www.tceperformanceproducts.com/caliper-mounting/

parish8 · 03-15-2018, 09:13 AM

Quote:

Originally Posted by PolynesianPowerhouse

Something basic that may help http://www.tceperformanceproducts.com/caliper-mounting/

Keep the ideas coming but I don’t think this is the problem. The calipers are verticals with the bleeder pointed strait up.

Turns out things are not good enough. After some aggressive driving last night I could smell my brakes and the rear rotors were at least twice as hot as the front. I am going to have to sort this out before I continue tuning.

Someone suggested Teflon tape on the bleeder threads and using a mightyvac, I have that stuff and will try that next. If that doesn’t work I may just take it to someone that can do the “automated bleed cycle”.

Alpha1BC · 03-15-2018, 03:09 PM

Quote:

Originally Posted by parish8

Keep the ideas coming but I don’t think this is the problem. The calipers are verticals with the bleeder pointed strait up.

Turns out things are not good enough. After some aggressive driving last night I could smell my brakes and the rear rotors were at least twice as hot as the front. I am going to have to sort this out before I continue tuning.

Someone suggested Teflon tape on the bleeder threads and using a mightyvac, I have that stuff and will try that next. If that doesn’t work I may just take it to someone that can do the “automated bleed cycle”.

I'd personally suggest avoiding teflon tape and get something like this. Friend of mine has had pretty good luck with it and it lasts a full year before re-applying (he bleeds after each of his 10+ track days a year). I don't think teflon tape would last that long, nor do I like the risk of the tape ripping and getting into the caliper with the constant tightening/loosening of the bleed screw.

Dubchitts · 03-16-2018, 12:23 AM

Quote:

Originally Posted by Alpha1BC

I'd personally suggest avoiding teflon tape and get something like this. Friend of mine has had pretty good luck with it and it lasts a full year before re-applying (he bleeds after each of his 10+ track days a year). I don't think teflon tape would last that long, nor do I like the risk of the tape ripping and getting into the caliper with the constant tightening/loosening of the bleed screw.

Did you re-use the copper crush rings between the line and caliper?

03-11-2018, 08:51 PM	#1
parish8 Drives: 17 SS a8 Join Date: Feb 2010 Location: omaha Posts: 1,678	Brake issue, sinking pedal after bleeding brakes I put on the 15”(wheel) rear brake kit and bled the brakes. Now I have a slowly sinking brake pedal when I step on the brakes. It’s not spongy, it is sinking. I went ahead and bled them some more, about 10 cycles per corner and the problem is still there. I never let the fluid get low and there are no leaks. Any ideas? Seems like a bad master cylinder. Maybe there is a special brake bleeding procedure we need to use? __________________ dropped a valve in the 6.2. now running a drop in rods and piston 5.3 best et 5.83@121 with the 5.3 http://www.camaro6.com/forums/showthread.php?t=465472

03-13-2018, 03:15 PM	#7
bpang1234 You can only YOLO once. Drives: '16 2SS & '15 Subaru Forester Join Date: Jan 2016 Location: Albany, OR Posts: 1,677	Yeah sometimes you can get a bubble in there even if you try really hard not to. __________________ 2016 Camaro 2ss -Summit White / Ceramic White -8A, NPP, MRC, Ceramic White package plus knee pads, black bowties. -1st Car to have the "full" SEMA High Performance Graphics kit from 6LEDesigns. -1st Car to have the 6LEDesigns Blade Spoiler. -Borla S-Type w/ custom H-Pipe -Procharger P-1X Stage 2

03-13-2018, 05:04 PM	#8
parish8 Drives: 17 SS a8 Join Date: Feb 2010 Location: omaha Posts: 1,678	I tired the mallet on the caliper trick. Didn’t help at all. Sounds like I need to go through the “automated bleed cycle”. It will be in for an alignment soon, maybe I will just have them do it. __________________ dropped a valve in the 6.2. now running a drop in rods and piston 5.3 best et 5.83@121 with the 5.3 http://www.camaro6.com/forums/showthread.php?t=465472

03-15-2018, 08:33 AM	#11
PolynesianPowerhouse Big Samoan ina little car Drives: 2016 camaro Join Date: May 2014 Location: Tofiga Island Posts: 1,872	Something basic that may help http://www.tceperformanceproducts.com/caliper-mounting/ __________________ Don't sit around and watch everyone else live YOUR dreams...DO SUMPT'N When I see posts asking "whats the best intake, exhaust, etc" .... the answer to that is like a grandfather telling his grandkids "if you put salt on a birds tail, it'll let you catch it" #ThinkAboutIt "Winning Tip: Don't take my (or anyone else's) word for it. GO TEST IT!" - Dennis Grant

03-12-2018, 05:13 AM	#2
Burly Drives: 2016 Camaro 2SS Join Date: Apr 2016 Location: Spotsylvania, VA Posts: 724 View My Garage	Had my calipers powder coated Friday and I’ve tried all weekend trying to bleed my brakes but it’s still sinking and soft. I give up and calling dealer this morning.

03-12-2018, 01:24 PM	#3
Perdieu Drives: 2017 Nightfall Grey Auto 2SS Join Date: Mar 2012 Location: Blue Springs MO. Posts: 525	I have the same issue, but its only when I'm just sitting. Driving it you can't tell anything is different.

03-12-2018, 01:52 PM	#5
Burly Drives: 2016 Camaro 2SS Join Date: Apr 2016 Location: Spotsylvania, VA Posts: 724 View My Garage	I drove around quite a bit Sunday and its not sinking as bad but definitely not as hard as should be. Got an appointment with dealer tomorrow morning. They "owe" me a service so I hoping I can get this done almost free.

03-13-2018, 11:25 AM	#6
Burly Drives: 2016 Camaro 2SS Join Date: Apr 2016 Location: Spotsylvania, VA Posts: 724 View My Garage	Just got back from dealer and back to normal. They just did thier “normal” brake fluid flush procedure. Sorry I didn’t get any more info than that.

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