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Old 02-20-2013, 07:44 PM   #1
jgoossen92
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No brake pressure after replacing front caliper

I just replaced my right passenger side front brake caliper and there is brake fluid comming out of the bleeder valve when I let the air out of the system. The caliper is getting fluid and it is brand new and assembled correctly. Why is there no pressure building up when I pump the brakes? The brake petal almost goes all the way to the floor and there is no resistance after pumping multiple times. Could it be a faulty caliper or the master cylinder?

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Old 02-20-2013, 07:55 PM   #2
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you need to bleed the the line..
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Old 02-20-2013, 07:57 PM   #3
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Oh my.
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Old 02-20-2013, 07:58 PM   #4
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you need to bleed the the line..
it says he bled the line
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Old 02-20-2013, 07:59 PM   #5
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We bleed the line and there is fluid comming out. No air should be remaining and there is no pressure building up.

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Old 02-20-2013, 08:01 PM   #6
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it says he bled the line
No it doesn't. It says fluid is coming out of the bleeder. Not the same thing.

You replaced a caliper. You need to bleed the whole system. Have it towed to a shop. Sounds like this is beyond your skill set.
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Old 02-20-2013, 08:04 PM   #7
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I just replaced my right passenger side front brake caliper and there is brake fluid comming out of the bleeder valve when I let the air out of the system. The caliper is getting fluid and it is brand new and assembled correctly. Why is there no pressure building up when I pump the brakes? The brake petal almost goes all the way to the floor and there is no resistance after pumping multiple times. Could it be a faulty caliper or the master cylinder?

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No it doesn't. It says fluid is coming out of the bleeder. Not the same thing.

You replaced a caliper. You need to bleed the whole system. Have it towed to a shop. Sounds like this is beyond your skill set.
excellent cherry picking, but OP did say when he let the air out of the system.
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Old 02-20-2013, 08:05 PM   #8
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OP, did you top off the fluid before you started the bleeding process?
Did you ensure the reservoir never went dry?
If the fluid went too low, you may now have air in the ABS system. This will require a dealer or very good indy mechanic visit.
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Old 02-20-2013, 08:06 PM   #9
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Bleed the whole system how? All 4 calipers? That doesn't answer my question

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Old 02-20-2013, 08:08 PM   #10
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Oh my is right. OP, you need to read some brake bleeding threads until you're really nauseous.

But, to help a bit, if it was me, I'd start by opening up the bleeder valve and with the lid off the reservoir, make sure it doesn't get too low...keep it filled and let the caliper gravity drain for a while.

Close bleeder tight after maybe 10 mins of dripping and try manual bleeding with a partner. Pump, pump, pump, pump...hold down, then you open bleeder for a little until his foot goes the floor. Make sure he doesn't lift up his foot until you've closed the bleeder again.

Go through that 3-4 times and with any luck, you'll have it.

If you've messed up and gotten air in up in the system, you might need a shop, or a local with software and knowhow. It could be that abs system has air, and you need a computer to cycle it to purge out the air.

Read until you puke, OP, find a knowledgeable local, or tow it to a shop. Hopefully you have AAA or your insurance covers the tow.
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Old 02-20-2013, 08:14 PM   #11
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If you've changed a caliper and didn't intentionally block off the line, and especially given that you didn't know that, you have air in your whole system. Start at the passenger rear and bleed it down, then driver rear, passenger and then driver. If your lucky you'll bleed out the abs and not have to cycle it. But probably not.
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Old 02-20-2013, 08:28 PM   #12
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I will give that a try and post the results. Hopefully it doesn't require a computer. I added brake fluid before the bleeding process so there shouldn't be any other issues

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Old 02-20-2013, 08:28 PM   #13
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you're supposed to tie the brake line straight up so all the fluid doesn't leak out, then all ya have to do is bleed the one caliper
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Old 02-21-2013, 12:22 PM   #14
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If you disconnected the caliper from the brake hose and left the hose dangling/dripping? the air will migrate up into the ABS unit.
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Old 02-21-2013, 12:35 PM   #15
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you have air in the system somewhere. period. try again
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Old 02-21-2013, 12:40 PM   #16
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He could have bled it properly, just not tightened something enough. Do you see brake fluid squirting anywhere when you pump the pedal?
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Old 02-21-2013, 08:55 PM   #17
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Thank you all I can happily say the problem is resolved. Air got into the system through the reservoir that I forgot to top off before bleeding the system. I had to purchase more dot 3/4 brake fluid and bleed the calipers in the following order: back right then back left, front right then front left. I printed off instructions at AutoZone where I got the fluid. I also zip-tied the brake line to the shock overnight when the caliper was off so air got in that way also. Why do 30min jobs on a BMW usually turn into 2hrs? Thanks again for the help some of you knew what you were talking about! M POWER!!!!!

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Old 02-21-2013, 10:42 PM   #18
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OP, you might not have abs working and not know it. I don't know if it shows a light, but the story is once air gets into abs system, it either needs to be bled by a computer, or you take it out on ice or a gravel road, and get the air out of it that way...not sure the latter method works, though...seems possible, but I'm not sure.

You might want to check it out and see if it's okay or not. Might be if it didn't get into abs system. Hope not.
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