 bleeding brakes after caliper conversion |
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| Neal |
 Apr 24 2004, 07:07 PM
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#1
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Member  Group: Members Posts: 300 Joined: 23-April 03 From: Sammamish, Washington Member No.: 605  |
I just installed 320i calipers and I have bled all 4 corners but I still have almost no pedal pressure. I have ss brake lines and the calipers were rebuilt. Can somone give my an idea on what to do. I looked at Proportioning valve with a search but I don't know if you can bleed them also ?
Neal |
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| mike_the_man |
Apr 24 2004, 07:15 PM
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#2
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I like stuff! Group: Members Posts: 1,338 Joined: 11-June 03 From: Regina, Saskatchewan, Canada Member No.: 809 |
get rid of the proportioning valve. Replace it with a T. What about the master cylinder? Did you replace it? Is it good? Get rid of the prop valve and keep bleeding. Good luck!
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| Neal |
Apr 24 2004, 07:41 PM
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#3
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Member Group: Members Posts: 300 Joined: 23-April 03 From: Sammamish, Washington Member No.: 605 |
Brakes were good this morning before the conversion. 19mm M/S which is new rear calipers are new. I asked if you could bleed the propotioning valve or where there could be more air trapped. As I said I have bleed all 4 wheels and I did not see any more air there.
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| Dave_Darling |
Apr 24 2004, 08:24 PM
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#4
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914 Idiot Group: Members Posts: 14,986 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Keep bleeding, you've still got air trapped. You can bleed the prop valve the same way as the calipers, except that you crack open the outlet fittings (the inlet is the one on the bottom, the outlets are the other ones) one at a time instead of a bleeder valve. Have a rag wrapped around the fitting, as brake fluid is kinda nasty stuff. Clean up with water after you're done, because the water will neutralize the brake fluid and may save your paint.
Make sure that the bleeders are at the top of the calipers, not the bottom. If you bleed from the bottom fittings, you'll never get the air out because air rises. (Don't ask how I know...) Bleed all around the car; air has a seemingly-magical ability to teleport from one end of the brake system to the other. --DD |
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| Neal |
Apr 24 2004, 09:04 PM
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#5
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Member Group: Members Posts: 300 Joined: 23-April 03 From: Sammamish, Washington Member No.: 605 |
Dave, when you say outlets are you speaking of the prop valve ?. The rear calipers on my car have two bleeders 1 top one bottom, I did bleed from the bottom. The 320i calipers only have one bleeder and it's on the bottom. Should I bleed the prop valve 1'st or the calipers. Thanks for taking the time to reply I need to fix this as I have no brakes at this time. When I bled I did not see any air in the clear tube I used how will I know when I am air free, is it by pedal pressure ?
Neal |
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| J P Stein |
Apr 24 2004, 09:13 PM
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#6
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
Air rises in fluid.
You're never gonna get it out bleeding from the bottom of the caliper. I know nuthin about BMW calipers but it sounds like you have the fronts on the wrong sides of the car......bleeder screws on the bottom? |
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| Neal |
Apr 24 2004, 09:39 PM
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#7
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Member Group: Members Posts: 300 Joined: 23-April 03 From: Sammamish, Washington Member No.: 605 |
JP, they only fit one way as far as I could tell
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| Slowpoke |
Apr 24 2004, 09:46 PM
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#8
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Member Group: Members Posts: 116 Joined: 1-June 03 From: Tucson, AZ Member No.: 768 |
Sorry, they are on the wrong sides. Bleeders must be on the top.
Peter |
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| Neal |
Apr 24 2004, 10:25 PM
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#9
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Member Group: Members Posts: 300 Joined: 23-April 03 From: Sammamish, Washington Member No.: 605 |
Well isn't that the shits, well it's a learning procees. I get to do it agin tomrrow
Neal (IMG:style_emoticons/default/mad.gif) |
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| Dave_Darling |
Apr 24 2004, 11:26 PM
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#10
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914 Idiot Group: Members Posts: 14,986 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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When I said "outlets", I did mean on the prop valve.
And you must always bleed from the top of the caliper. You have now experienced why you don't bleed from the bottom--you cannot get the trapped air out. Swap the fronts, bleed the rears from the top bleeders, and bleed the fronts. The pedal should be nice and firm when you're done. --DD |
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| Neal |
Apr 25 2004, 12:12 AM
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#11
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Member Group: Members Posts: 300 Joined: 23-April 03 From: Sammamish, Washington Member No.: 605 |
Dave, you are the man !, I just swapped the calipers, bleeder now on top, which is something I will never forget. Bending the tubing for a second time to fit the inlet on the calipers is not fun !. I will follow your instructions tomorrow.
I had emailed the person I bought the calipers from and he replied and said I had them swapped. At least he is supportive of my ignorance. Neal (IMG:style_emoticons/default/boldblue.gif) |
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