Leaking brake pump straight after brake fluid change - coincidence?
02-06-2006, 06:55 AM
#16
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Originally Posted by Adrian
Sorry Patrick, but what you have been told is absolute nonsense. The only way during a fluid change that the seals can be damaged is if they use a vacuum to extract the fluid. I have seen this done and pressure seals do not like vacuums.If the job is done properly there can be no sudden pressure change.
The system pressure is bled off by pumping the brake pedal.
The system pressure is bled off by pumping the brake pedal.
Adrian - Does this mean we should not be using pressure bleeders? I was under the impression that this was a safer route than pumping the pedal.
So is this a C4 only issue or does it pertain to C2 as well?
02-06-2006, 08:32 AM
#17
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James,
Vacuum is sucking, pressure is blowing.
Pressure seals require a positive pressure to seal.
Vacuum applies a negative pressure and can pull the seals out of their sealing positions.
Pressure bleeders provide positive pressure of approximately 1.5 bar or 22psi. 1 bar = 14.7psi.
You cannot properly bleed the brakes of a hydraulic boosted system (C4 etc) using the brake pedal.
Ciao,
Adrian.
Vacuum is sucking, pressure is blowing.
Pressure seals require a positive pressure to seal.
Vacuum applies a negative pressure and can pull the seals out of their sealing positions.
Pressure bleeders provide positive pressure of approximately 1.5 bar or 22psi. 1 bar = 14.7psi.
You cannot properly bleed the brakes of a hydraulic boosted system (C4 etc) using the brake pedal.
Ciao,
Adrian.
02-06-2006, 10:06 AM
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Thanks Adrian. That's what i thought you were going to say. So i guess i will not use my fluid extractor to bleed/flush any more - I just used it for the first time on the clutch slave and it worked great. I suppose a purchase of a pressure bleeder is in order.
jg
jg
02-06-2006, 02:05 PM
#19
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Originally Posted by greenjt
Thanks Adrian. That's what i thought you were going to say. So i guess i will not use my fluid extractor to bleed/flush any more - I just used it for the first time on the clutch slave and it worked great. I suppose a purchase of a pressure bleeder is in order.
jg
jg
Ciao,
Adrian.
02-06-2006, 07:54 PM
#20
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Originally Posted by d964
I am having the EXACT same problem. Would anyone have the part# for this item?
O-ring is 999.707.094.40
(Just read off box & baggy of both items sitting directly in front of me).
p.s.: Sunset Porsche seems to have the best price for the switch. No affiliation, but satisfied customer.
