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#1 2016-11-28 13:07:26

Rodman
Member
From: Long Island
Registered: 2006-03-01
User Number: 1046
Posts: 1918

Brake pedal to the metal

As some of you may know, I've been working on the worthy cause of rescuing a 2005 aero. I'm having difficulty getting the brake pedal up after bleeding the brakes. I see no more air coming out of any of the calipers, the pedal builds pressure after pumping it and stays strong but once I let go the pedal and press it down again it just travels to the floor. Is it possible my master cylinder is bad ? The reason I'm confused is that I would expect the system to not hold pressure if the master cylinder is bad. What say you people ?
Thanks for sharing your wisdom.


2005 satin gray metalic aero, sold.
2005 black aero, rescue project, jdm STi ver 7 drivetrain.
2008 Subaru Outback 2.5i 5 speed manual daily driver.
2006 WRX, smoked, should've never betrayed 2.0L love.

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#2 2016-11-28 13:55:48

mbandi
Mmmmmmm Scooby!
From: Transfer, Pa
Registered: 2011-01-31
User Number: 5179
Posts: 234

Re: Brake pedal to the metal

Did you bleed the master or only the calipers?


SOLD: The Wife's 2005 9-2X Aero, 4EAT, Midnight Black Mica
SOLD: 2005 9-2X Aero, Manual, Arctic Silver, 2.1 Stroker
Mine: 2005 9-2X Aero. Desert Silver, 5 speed

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#3 2016-11-28 14:25:17

Rodman
Member
From: Long Island
Registered: 2006-03-01
User Number: 1046
Posts: 1918

Re: Brake pedal to the metal

I've been feeding oil to the master cylinder keeping it from going dry and bleeding the brakes the old fashion way. One person pumps the brake pedal 3 times and hold it, I open and close the bleed screw accordingly. Never heard of bleeding the master cylinder, how do I do that ?
Thanks.


2005 satin gray metalic aero, sold.
2005 black aero, rescue project, jdm STi ver 7 drivetrain.
2008 Subaru Outback 2.5i 5 speed manual daily driver.
2006 WRX, smoked, should've never betrayed 2.0L love.

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#4 2016-11-28 14:40:40

mbandi
Mmmmmmm Scooby!
From: Transfer, Pa
Registered: 2011-01-31
User Number: 5179
Posts: 234

Re: Brake pedal to the metal

It's very similar. Usually there is an adapter kit that comes with a new master cylinder, but you don't really need it. Have the person pump the brakes the same way. But when they are holding the pedal down, crack one of the lines loose at the master just like you would the bleeder screws on the caliper. Then after you have bled all of them, re-bleed at the calipers. It will take a good amount of brake fluid and it will make a mess.

What sometimes happens is that air gets trapped in the valve of the master and it will not let the pedal go all the way back.

Hope this helps.

FYI these master cylinders are usually very reliable, so you probably don't need a new one. Not that it's not possible however.

Last edited by mbandi (2016-11-28 14:42:38)


SOLD: The Wife's 2005 9-2X Aero, 4EAT, Midnight Black Mica
SOLD: 2005 9-2X Aero, Manual, Arctic Silver, 2.1 Stroker
Mine: 2005 9-2X Aero. Desert Silver, 5 speed

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#5 2016-11-28 14:56:32

Rodman
Member
From: Long Island
Registered: 2006-03-01
User Number: 1046
Posts: 1918

Re: Brake pedal to the metal

Thank you very much sir, I'll have to give that a shot.


2005 satin gray metalic aero, sold.
2005 black aero, rescue project, jdm STi ver 7 drivetrain.
2008 Subaru Outback 2.5i 5 speed manual daily driver.
2006 WRX, smoked, should've never betrayed 2.0L love.

Offline

 

#6 2016-11-29 10:30:17

snowphun
Member
From: Central CT
Registered: 2005-11-09
User Number: 890
Posts: 149

Re: Brake pedal to the metal

Are you losing fluid? Long ago I had a brake pedal that was fine when pressed firmly but sank if pressed slowly, fluid was getting past the seals and accumulating in the vacuum booster. If that's not it and you want to properly bleed the master you need to take it out of the car. The master, slave and hardlines can all be removed as one, bench bled and reinstalled. That was the only way to get my MY02 WRX sorted.

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#7 2016-11-29 12:34:56

Rodman
Member
From: Long Island
Registered: 2006-03-01
User Number: 1046
Posts: 1918

Re: Brake pedal to the metal

Its not losing fluid, the pedal firms up when pumped 3 times and stays rock solid while keeping my foot firmly on the pedal.


2005 satin gray metalic aero, sold.
2005 black aero, rescue project, jdm STi ver 7 drivetrain.
2008 Subaru Outback 2.5i 5 speed manual daily driver.
2006 WRX, smoked, should've never betrayed 2.0L love.

Offline

 

#8 2016-12-04 17:35:37

Rodman
Member
From: Long Island
Registered: 2006-03-01
User Number: 1046
Posts: 1918

Re: Brake pedal to the metal

Had all my calipers installed with the bleeder low, rotated the calipers so the bleeders would be up and was able to properly bleed the brakes. Stupid mistake.


2005 satin gray metalic aero, sold.
2005 black aero, rescue project, jdm STi ver 7 drivetrain.
2008 Subaru Outback 2.5i 5 speed manual daily driver.
2006 WRX, smoked, should've never betrayed 2.0L love.

Offline

 

#9 2016-12-04 18:26:24

mbandi
Mmmmmmm Scooby!
From: Transfer, Pa
Registered: 2011-01-31
User Number: 5179
Posts: 234

Re: Brake pedal to the metal

That would do it for sure!!!!  lol   Glad it worked out.


SOLD: The Wife's 2005 9-2X Aero, 4EAT, Midnight Black Mica
SOLD: 2005 9-2X Aero, Manual, Arctic Silver, 2.1 Stroker
Mine: 2005 9-2X Aero. Desert Silver, 5 speed

Offline

 

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