 spongy brakes, have run out of ideas |
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| nycchef |
 Jun 8 2010, 03:20 PM
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#1
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mechanical moron  Group: Members Posts: 952 Joined: 28-November 05 From: new york city n.y. Member No.: 5,202 Region Association: None  |
i have spongy brakes. all new pads front and rear (front calipers are rebuilt), bled them 3 times no bubbles, drove around, bled again , still no bubbles, still spongy, here is my thinking, (defective as it may be). the passenger side rear inside piston will not go in far enough to set the .008 clearance. it it set now at about.003, the others are fine is this the problem?
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Replies(1 - 9)
| yeahmag |
Jun 8 2010, 04:15 PM
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#2
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California 
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I don't think that would cause spongy brakes, but a Motiv Power Bleeder is your friend in situations like this. Best $50 you will spend on that car.
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| underthetire |
Jun 8 2010, 04:35 PM
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#3
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
Sounds to me like you had better check the pistons in the rear. Maybe that's causing the adjustment issue.
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| underthetire |
Jun 8 2010, 04:36 PM
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#4
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
And does this look like the same bleeder?
http://www.harborfreight.com/brake-fluid-bleeder-92924.html |
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| nycchef |
Jun 8 2010, 05:49 PM
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#5
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mechanical moron Group: Members Posts: 952 Joined: 28-November 05 From: new york city n.y. Member No.: 5,202 Region Association: None |
QUOTE(underthetire @ Jun 8 2010, 02:36 PM)  And does this look like the same bleeder? http://www.harborfreight.com/brake-fluid-bleeder-92924.html i thought the cap on the 914 was 45mm, thats what the european motive bleeder on pp says. |
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| McMark |
Jun 8 2010, 06:34 PM
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#6
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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 |
Do you have sub-par braking? Or just 'squishy' pedal?
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| mihai914 |
Jun 8 2010, 06:39 PM
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#7
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Senior Member Group: Members Posts: 800 Joined: 2-March 05 From: Montreal, QC Member No.: 3,697 Region Association: None
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If memory serves me right, the general concensus and from experienced techs, the clearance should be 0.004. Porsche issued a TSB (not 100% sure) but the info in the Haynes is wrong.
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| Mark Henry |
Jun 13 2010, 06:27 PM
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#8
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Crack the hard line at the proportioning valve as you bleed.
Yep, it will make a mess, have the cat dirt ready. |
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| Eric_Shea |
Jun 13 2010, 10:25 PM
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#9
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PMB Performance Group: Admin Posts: 19,275 Joined: 3-September 03 From: Salt Lake City, UT Member No.: 1,110 Region Association: Rocky Mountains  |
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| Andyrew |
Jun 13 2010, 10:44 PM
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#10
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Spooling.... Please wait Group: Members Posts: 13,376 Joined: 20-January 03 From: Riverbank, Ca Member No.: 172 Region Association: Northern California
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Check the rear calipers and the master cylinder.. A bad/leaky master cylinder will do that, and a bad rear caliper will also do that (had both happen to me)
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