soft brake pedal after sport brake upgrade

Ni55anPat · 04-27-2013, 03:14 AM

Upgraded to sport brakes (all fresh rebuild) with stop tech d/s rotors.

Did the brake bleeding, RR,LR, FR & FL.

Took out a few bubbles, still a soft pedal. Did this procedure 4 times, and all rears are good, front would have a bubble and still soft pedal.

Push down slightly, release and then push again...it feels okay.

but the first initial push, it's soft....half way down then it grips.

Any suggestions? Took a 30 min ride home, calipers are not hot, rotors are obviously hot to the touch and didn't seem like any leaks.

Any help would be appreciated.

Thanks

Chuck33079 · 04-27-2013, 06:30 AM

Sounds like there's still air in the system somewhere.

Ni55anPat · 04-27-2013, 07:33 AM

Yeah. What I thought. Bleed them 4/5 times already

clintfocus · 04-27-2013, 03:43 PM

is the brake master cylinder on Sport pack Z's the same as base model Zs?

grant · 04-27-2013, 03:55 PM

FSM says RR,LF,LR,RF is the sequence. You are bleeding both the inside and outside bleeders right? Each caliper has two bleed ports.

roy'sz · 04-27-2013, 04:03 PM

yeah I was going to call out and say you need to bleed of BOTHsides of the calipers otherwise you still have air in the system.

Ni55anPat · 04-27-2013, 07:15 PM

Correct. I'm doing both bleeders

sparky · 04-27-2013, 07:27 PM

Are you using a Motive or vacuum bleeder? If not you may need to get some more pressure and flow through the system to force the air out.
Or take it to a shop and have them "power" bleed it.

Baer383 · 04-27-2013, 09:08 PM

If you do a gravity bleed by opening all 8 bleeders at the same time and keep the M/C full in the process the air will remove itself,I do this on all my cars works like a charm.

And you don't have to use a power bleeder ,my way takes ten minutes

jcosta79 · 04-27-2013, 09:15 PM

Quote:

Originally Posted by clintfocus

is the brake master cylinder on Sport pack Z's the same as base model Zs?

I would check this.

wstar · 04-27-2013, 11:44 PM

I pretty much always bleed twice after any major brake work where lines were disconnected: do an initial quick bleed (outside then inside of each caliper), go for a test drive (in the most recent case: start the process of breaking in new rotors) which will knock the air bubbles around, and then come back home and re-bleed everything again. Usually on the 2nd bleed you catch a few more bubbles that didn't come out the first time.

Ni55anPat · 04-28-2013, 01:49 AM

Quote:

Originally Posted by Baer383

If you do a gravity bleed by opening all 8 bleeders at the same time and keep the M/C full in the process the air will remove itself,I do this on all my cars works like a charm.

And you don't have to use a power bleeder ,my way takes ten minutes

I'll try this! Thanks

clintfocus · 04-28-2013, 03:36 AM

gravity bleed is the best way, takes alittle time, and you need alot of bottles, but it works the best, dont cross contaminate old and new fluid, and it can be done alone. I used to work at Brembo NA and this was the method we were told to use

Baer383 · 04-28-2013, 12:28 PM

Quote:

Originally Posted by clintfocus

gravity bleed is the best way, takes alittle time, and you need alot of bottles, but it works the best, dont cross contaminate old and new fluid, and it can be done alone. I used to work at Brembo NA and this was the method we were told to use

You only need ten minutes and 1 quart of your favorite brake fluid.

clintfocus · 04-28-2013, 03:29 PM

^yeah i know, a little time is about 10-15 mins no? lol

04-27-2013, 03:14 AM	#1 (permalink)
Ni55anPat A True Z Fanatic Join Date: Mar 2010 Location: Chicago Posts: 1,831 Drives: Zed Rep Power: 18	soft brake pedal after sport brake upgrade Upgraded to sport brakes (all fresh rebuild) with stop tech d/s rotors. Did the brake bleeding, RR,LR, FR & FL. Took out a few bubbles, still a soft pedal. Did this procedure 4 times, and all rears are good, front would have a bubble and still soft pedal. Push down slightly, release and then push again...it feels okay. but the first initial push, it's soft....half way down then it grips. Any suggestions? Took a 30 min ride home, calipers are not hot, rotors are obviously hot to the touch and didn't seem like any leaks. Any help would be appreciated. Thanks

04-27-2013, 06:30 AM	#2 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	Sounds like there's still air in the system somewhere. m4a1mustang, Jordo!, DarkJak and 1 others like this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

04-27-2013, 03:43 PM	#4 (permalink)
clintfocus Track Member Join Date: Jan 2011 Location: los angeles Age: 39 Posts: 933 Drives: 370z, EK Civic, F150 Rep Power: 15	is the brake master cylinder on Sport pack Z's the same as base model Zs? Driftomodachi likes this.

04-27-2013, 03:55 PM	#5 (permalink)
grant Base Member Join Date: May 2012 Location: Georgia Posts: 128 Drives: AMG C43 Rep Power: 13	FSM says RR,LF,LR,RF is the sequence. You are bleeding both the inside and outside bleeders right? Each caliper has two bleed ports. Nut_N_Much likes this.

04-27-2013, 04:03 PM	#6 (permalink)
roy'sz A True Z Fanatic Join Date: Aug 2011 Location: palmdale, ca Posts: 1,299 Drives: 2010 nissan 370z Rep Power: 16	yeah I was going to call out and say you need to bleed of BOTHsides of the calipers otherwise you still have air in the system. __________________ https://www.youtube.com/watch?v=RtvG...data_playerARK HFC'S-ARK Grip-Stillen G3-M370-UPREV-Kinetix upper control arm-WC Latheworks-Stage2 Bad@$$ Driver(318whp/268tq)-

04-27-2013, 07:33 AM	#3 (permalink)
Ni55anPat A True Z Fanatic Join Date: Mar 2010 Location: Chicago Posts: 1,831 Drives: Zed Rep Power: 18	Yeah. What I thought. Bleed them 4/5 times already

04-27-2013, 07:15 PM	#7 (permalink)
Ni55anPat A True Z Fanatic Join Date: Mar 2010 Location: Chicago Posts: 1,831 Drives: Zed Rep Power: 18	Correct. I'm doing both bleeders

04-27-2013, 07:27 PM	#8 (permalink)
sparky Track Member Join Date: Jul 2011 Location: Vancouver, BC Posts: 642 Drives: 12 370Z GM AT Rep Power: 15	Are you using a Motive or vacuum bleeder? If not you may need to get some more pressure and flow through the system to force the air out. Or take it to a shop and have them "power" bleed it. __________________ 2012 370Z GM 7AT/JWM LEDs / 3M clear bra / 35% tint / GTR start button / FI CBE SS 18" RES / Momo shift knob / K & N Typhoon / Z1 hood struts / H&R 20mm f/r / illuminated kickplates

04-27-2013, 09:08 PM	#9 (permalink)
Baer383 A True Z Fanatic Join Date: Aug 2010 Location: Lawrenceville,Ga Posts: 4,293 Drives: My foot up your azz Rep Power: 30	If you do a gravity bleed by opening all 8 bleeders at the same time and keep the M/C full in the process the air will remove itself,I do this on all my cars works like a charm. And you don't have to use a power bleeder ,my way takes ten minutes DEpointfive0 likes this. __________________ 2013 ZL1 754 rwhp 747 rwtq

04-27-2013, 11:44 PM	#11 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	I pretty much always bleed twice after any major brake work where lines were disconnected: do an initial quick bleed (outside then inside of each caliper), go for a test drive (in the most recent case: start the process of breaking in new rotors) which will knock the air bubbles around, and then come back home and re-bleed everything again. Usually on the 2nd bleed you catch a few more bubbles that didn't come out the first time. DEpointfive0 likes this. __________________ 7AT Track Car! Journal thread / Car setup details

04-28-2013, 03:36 AM	#13 (permalink)
clintfocus Track Member Join Date: Jan 2011 Location: los angeles Age: 39 Posts: 933 Drives: 370z, EK Civic, F150 Rep Power: 15	gravity bleed is the best way, takes alittle time, and you need alot of bottles, but it works the best, dont cross contaminate old and new fluid, and it can be done alone. I used to work at Brembo NA and this was the method we were told to use

04-28-2013, 03:29 PM	#15 (permalink)
clintfocus Track Member Join Date: Jan 2011 Location: los angeles Age: 39 Posts: 933 Drives: 370z, EK Civic, F150 Rep Power: 15	^yeah i know, a little time is about 10-15 mins no? lol

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