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kilodawg's Avatar
 
Join Date: Oct 2004
Location: Florida
Posts: 1,735
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Leaking air sound while depressing brake pedal

Tried searching for this but no joy. This evening I noticed an air leaking sound while pressing down on the brake pedal. The sound occurs while the pedal is between about 1/3 and 2/3 depressed and seems to come from the pedal area itself. It goes away when fully engaged and brake performance seems unaffected. Any ideas?
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'73 914 2.0, '74 911 Coupe, '74 911 Targa
'78 924, '84 944, '86 944 Turbo, '84 911 Coupe
'84 944 (current), '96 993 Coupe (current)
'73 911T Coupe (current)
'88 930S M505 (current)
Old 03-04-2010, 04:35 PM
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Join Date: May 2008
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sounds like a leaking brake booster. Its the "power assist" part of the brakes. Its the large black round part that the brake maser cylinder is attached to
Old 03-04-2010, 05:11 PM
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The little I read indicated that a leaky booster would result in a stiff pedal mine is no different than before. Is that a bad assumption?
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'73 914 2.0, '74 911 Coupe, '74 911 Targa
'78 924, '84 944, '86 944 Turbo, '84 911 Coupe
'84 944 (current), '96 993 Coupe (current)
'73 911T Coupe (current)
'88 930S M505 (current)
Old 03-04-2010, 05:18 PM
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Join Date: Jul 2001
Location: ~Carefree Highway~
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I replaced the brake booster on my '98 Cherokee last year.
I had a sucking sound when I pressed the brake pedal.

You chould check the booster air check valve for operation but it is most likely a leaking diaphram in the booster. Check all your vacuum lines.

Here is a simple check I did. There are many more if you search.
Vacuum Boost

Check to see what brake MC you have and if you are lucky it will be the ATE.
Porsche 924S/944/968 Brake Hydraulics - Page 2

GL
John_AZ
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1988 924S 70K 6/2014 ...+ 1987 924S 129K DD
Old 03-05-2010, 03:50 AM
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Old 03-05-2010, 03:50 AM
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