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Hissssssss from brake depression
I have a 78 SC. Just put new seals in front caliper pistons, stainless lines, new front shoes and new front rotors and new fluid. All bled out nicely. Brakes seem to work great. However, when depressing the brake I hear a hissssssss sound -- seems like it is coming from under the dash. The sound continues while the car is stopped and the brake pedal is depressed. No leaks I can find and no softness in the brakes.
Any ideas? Writing this, it occurs to me to have someone listen at the master cylinder to see if it is coming from there.
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Brad Inventor of SNAPGAP - The Valve Adjustment Solution Patented in U.S. and Europe. Go to SNAPGAP.US or PM me. https://www.pelicanparts.com/More_Info/SNPVAK11146.htm?pn=SNP-VAK11146 |
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03-13-2015, 09:51 AM
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Join Date: Oct 2001
Location: San Carlos, CA US
Posts: 5,529
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brake booster leaks, maybe? or, your master cyl is causing that leak at the booster because it feels neglected after you replaced everything else.
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Porsche 2005 GT3, 2006 997S with bore-scoring Exotic: Ferrari F360F1 TDF, Ferrari 328 GTS Disposable Car: BMW 530xiT, 2008 Mini Cooper S Two-wheel art: Ducati 907IE, Ducati 851 |
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03-13-2015, 10:14 AM
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Hi Brad, yeah it's the booster or the o-ring at the master cylinder connection. Use a small vacuum line up to your ear and listen for the location of the leak.
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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03-13-2015, 11:38 AM
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Join Date: Oct 2010
Location: N. of Boston
Posts: 319
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Had same problem when I rebuilt brakes on my Alfa. You may have over extended the brake pedal travel when you were bleeding them out. May have done some damage to the booster bladder.
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G. Hamilton '82 SC Guards Red-2nd time owned-Now sold "Bumerang" '70 TR6 N of Boston |
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03-13-2015, 11:41 AM
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Thanks guys. I guess I better fix that.
Kodio -- I have not forgotten about the 95mm ring compressor!
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Brad Inventor of SNAPGAP - The Valve Adjustment Solution Patented in U.S. and Europe. Go to SNAPGAP.US or PM me. https://www.pelicanparts.com/More_Info/SNPVAK11146.htm?pn=SNP-VAK11146 |
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03-13-2015, 12:56 PM
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Quote:
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1974 sahara beige 911 targa 1982 chiffon 911sc 1985 prussian blue metallic carrera |
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03-14-2015, 06:42 AM
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I would enjoy that. And this time I will drive a SC, not a Honda Element!
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Brad Inventor of SNAPGAP - The Valve Adjustment Solution Patented in U.S. and Europe. Go to SNAPGAP.US or PM me. https://www.pelicanparts.com/More_Info/SNPVAK11146.htm?pn=SNP-VAK11146 |
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03-16-2015, 07:01 AM
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1974 Porsche 911 targa 2.7
