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Old 04-11-2007, 07:48 PM   #1
PhastEddie
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Default Upgraded 03 WRX to 4pot/2pot. Brakes feel soft.

I have bled them twice. I am not a novice at this stuff. I am not sure what the deal is. The pedal goes down almost to the floor before I get any stopping power. if I pump the brake really hard real fast it grabs. But if I brake slowly, she goes down to the floor. The fluid was flushed and filled with motul racing brake fluid. Anyone got a suggestion?
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Old 04-11-2007, 07:59 PM   #2
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I had the same thing last time I did pads and rotors. I wound up bleeding and checking twice, when i cleared the last air bubble. I'd say you either still have one air bubble left in the line (which I suggest you have someone stomp on the brake pedal while you bleed the rears) or your master cylinder is on it's way out. More likely air than a bad MS though.
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Old 04-11-2007, 08:12 PM   #3
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It could very well take more than 2 times. Further, if you have air in the abs system, you'll have to get out there and engage that a few times, then bleed to get it out of there.

Without a power bleeder, pulling everything off like you had to, a few more times to get it right wouldn't suprise me.
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Old 04-11-2007, 08:52 PM   #4
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Will a power bleeder take care of the abs possibly as well? If so, what is the proper way to use the power bleeder? Are you referring to a pump as well?
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Old 04-11-2007, 10:21 PM   #5
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it could be the seal in the master cylinder failing... I'd say maybe air in the master, but that wouldn't respond the way you said it does if you hit the pedal quickly
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Old 04-11-2007, 10:35 PM   #6
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Are you having trouble getting the pedal "hard" when the car is off? If there's little or no air in the lines then you should be able to get it rock hard with the car off.

If not then bleed some more.

If that still doesn't work then I would start to suspect a blown seal.

which reminds me of a joke.

A penguin is driving down the road in the desert. it's hot. Really hot. Suddenly his car starts freaking out. He pulls into the closest town and finds a mechanic. While standing there in the hot waiting for the mechanic he's really uncomfortable. Afterall, he's a penguin.

So he decides he's going to wander into town to find something to cool himself off. Off in the distance he sees an ice cream parlor...

Oh, wait. I've told this one here before.
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Old 04-12-2007, 01:43 PM   #7
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Are the bleed screws on the calipers pointing up or down?
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Old 04-12-2007, 02:25 PM   #8
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Quote:
Originally Posted by Turn in Concepts View Post
Oh, wait. I've told this one here before.

I had to Google the rest of the joke. Funny.
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Old 04-12-2007, 08:30 PM   #9
PhastEddie
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Yes when the car is off, it takes two pumps and its rock hard.
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Old 04-12-2007, 08:44 PM   #10
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Quote:
Originally Posted by Psydotek View Post
Are the bleed screws on the calipers pointing up or down?
pay attention to this post- it's more common than you think getting the calipers swapped

if they are correct l/r and further bleeding doesn't help- I'd consider a power bleeder like Motive- relatively inexpensive and it allows you to crack the bleeders longer than "traditional" bleeding- often yielding some nasty, long air bubbles.

w/o a doubt something is awry as the 4/2 pots will yield a firmer pedal the oe sliders
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Old 04-12-2007, 09:22 PM   #11
PhastEddie
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The bleeding screws are in the proper place at the tops. Now, I highly doubt the MC is bad as it was fine before the install. I am going to try to bleed her one more time this weekend and get some hard pumps in there to push any other air out. Everything is installed correctly.
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