 Brake Bleeding, Bubble question |
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| sjhowitson |
 May 26 2005, 08:22 AM
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#1
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Member  Group: Members Posts: 478 Joined: 4-August 04 From: Moraga, CA Member No.: 2,449  |
This may be a stupid question but, When I was bleeding the brakes last night we would get bubbles in the reservoir when we pumped the brake. Is that normal? Also does anyone know what size wrench to use on stock 911 bleeder nipple?
We finished the job. No major bubbles out of the brakes themselves. No major change in pedal feel. Feeling stupid this morning. Anyone want to add to it? Let fly.... (IMG:http://www.914world.com/bbs2/html/emoticons/unsure.gif) |
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| tat2dphreak |
May 26 2005, 08:33 AM
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#2
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stoya, stoya, stoya Group: Benefactors Posts: 8,797 Joined: 6-June 03 From: Wylie, TX Member No.: 792 Region Association: Southwest Region  |
bubbles in the resevoir are normal until you get the brakes bled...
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| ArtechnikA |
May 26 2005, 08:34 AM
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#3
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
stock what kind of 911?
'M' caliper bleedscrew is 7mm 'S' caliper bleedscrew is 10mm others, i donno... i've seen bubbles in the reservoir - i guess it's possible that splashing or fothing could trap a bubble in the line to the MC. i doubt it's actually coming from inside the MC or brake lines although it's certainly possible i suppose. when bleeding it's important to be GENTLE on the pedal. no flutter-foot, no stomping... you're just trying to transfer fluid and displace air. since the reservoir is the highest part of the car, it makes sense that any air in the system that is not displaced out toward the caliper would eventually coalesce at the reservoir... |
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| McMark |
May 26 2005, 01:46 PM
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#4
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
It's all about quantity. I've had nightmares bleeding brakes until recently. The setup that worked 100% for me twice in the last two weeks: PowerBleeder (pressurized tank) set to 15 psi, run a quart through the system using both top & bottom bleeder screws, 1/4 quart per caliper, only go around once. The idea is to open the system for a long time. Close off the system and pump the brake pedal. The idea here is to upset any bubbles that might still be trapped. Let it sit for about 30 minutes and pump the pedal again and run another quart through as before. Both times gave me great great pedal.
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