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Old 08-20-2012, 10:10 PM   #1 (permalink)
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Default No pressure in front brake lever

Hi guys,

I got a stock 2006 636. Lost front brake pressure.

I was bleeding my front brakes and was getting good pressure built up using the manual method. Started off with front master cylinder, did the left caliper, then the right caliper.
  1. Squeeze and hold the front brake lever
  2. Open the bleeder until fluid/bubbles come out
  3. Close the bleeder
  4. Release the front brake lever

Not sure when and if I accidentally let go of the brake lever while the bleeder was open. I know for sure that the plastic tube that I was using exploded twice out of the bleeder while I had the brakes squeezed (my dumbass mistake). It was still good with the pressure for the next few pumps but then it lost the pressure and nothing comes out of the M/C bleeder.

Now NOTHING comes out of the M/C bleeder and I have no lever pressure. I can squeeze the lever in and freely roll the wheels. I removed the banjo bolt/brake hose form the M/C and held my finger underneath the M/C and while I squeeze the brake lever. I do get air/pressure on my finger trying to come out of the hole where the banjo bolt goes in. I tried bleeding from the calipers and from the M/C for 2 days to no avail. I get fluid to come out slowly out of the right caliper while it comes out fast from the left. Sometimes I get some fairly medium sized bubbles but for the last few tries, I got no bubbles, just fluid.

What do? Is this a broken M/C that needs to be rebuilt or do I still got air in it? Any other way to get it out? Should I try reverse bleeding with the syringe pushing fluid into the calipers or M/C?
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Last edited by maschinetheist; 08-20-2012 at 10:28 PM.
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Old 08-21-2012, 08:28 AM   #2 (permalink)
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Sounds like tons of air my man. Do the reverse bleeding
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Old 08-21-2012, 10:25 AM   #3 (permalink)
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Quote:
Originally Posted by boloson View Post
Sounds like tons of air my man. Do the reverse bleeding
Start from the left caliper or right? And just push the fluid with the syringe? Do I press the brake lever when injecting?
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Old 08-21-2012, 10:27 AM   #4 (permalink)
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Bleed the calipers first, then do the master. (air will rise to the master)

You may have to do this several times.

Just so we've got the obvious covered, you do have enough fluid in the MC reservoir so that you're not sucking air into the MC, right?
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Old 08-21-2012, 10:34 AM   #5 (permalink)
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Originally Posted by chuckbear View Post
Bleed the calipers first, then do the master. (air will rise to the master)

You may have to do this several times.

Just so we've got the obvious covered, you do have enough fluid in the MC reservoir so that you're not sucking air into the MC, right?
I have plenty of fluid in the M/C reservoir. It's above the "upper" line. Honestly, I haven't even had to refill it when I spent about 2 hours pumping yesterday trying to bleed again :|
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Old 08-21-2012, 10:37 AM   #6 (permalink)
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Shouldn't matter which caliper first. Empty out the mc reservoir, fill syringe and push through caliper till u see fluid comg out the reservoir, tap lines, move to other caliper and push fluid up till u fill reservoir about half way, tap lines. With this method u shouldn't have to bleed the mc but sounds like u have tons of air in your system.
Make sure when u fill syringe that u have enough fluid in it to fill up to the reservoir so u don't refill it and introduce air. Try this and if this doesn't work there's another method that's full proof. The traditional way of pump pump open close sucks
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Old 08-21-2012, 10:49 AM   #7 (permalink)
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Quote:
Originally Posted by boloson View Post
Shouldn't matter which caliper first. Empty out the mc reservoir, fill syringe and push through caliper till u see fluid comg out the reservoir, tap lines, move to other caliper and push fluid up till u fill reservoir about half way, tap lines. With this method u shouldn't have to bleed the mc but sounds like u have tons of air in your system.
Make sure when u fill syringe that u have enough fluid in it to fill up to the reservoir so u don't refill it and introduce air. Try this and if this doesn't work there's another method that's full proof. The traditional way of pump pump open close sucks
Always bleed the caliper furthest from the mastercylinder first.
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Old 08-21-2012, 11:25 AM   #8 (permalink)
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Alright, I'll try reverse bleeding with the syringe tonight when I get home, starting with the left caliper first. What's the other method if you don't mind me asking?
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Old 08-21-2012, 11:47 AM   #9 (permalink)
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The manual way, like you described.

Personally, I don't prescribe to the way being described with a syringe. I'll use a vacuum pump if I've completely emptied the system of brake fluid just to get new brake fluid in the system quickly, but I find the manual method to be the most precise and effective. Once you get the hang of it, it does take a little practice, it is quite quick.
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Old 08-21-2012, 12:18 PM   #10 (permalink)
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Manual method has never failed me. Start with the caliper farthest from the master, move to the other caliper, then move up to the master. It's an easy concept, move from lowest point to highest.

You spent two hours pumping and bleeding with no change in reservoir level? Are you lines tight? Re-check that everything is tight, then bleed as previously described. The pumping method you listed in the first post is correct. Hold the lever, crack open and closed the bleeder, release lever, repeat. Even with the lines completely dry it should only take a few pumps before you start seeing fluid come out of the bleeder. If nothing comes out after several attempts, then re-evaluate what you're doing. Either something isn't tight or your master cylinder has shat the bed.
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