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Bill is Dead.
Join Date: Jul 2005
Location: Alaska.
Posts: 9,633
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Brake fluid backflow?
Somebody please explain this before I have to start selling the excess fluid on eBay.
A while back, when I checked the fluid before a race, I found that the top of the resevoir had some errant fluid around the cap. I sopped it up with a shop towel and checked the resevoir - which was full. This past weekend, I again checked the fluid before an event, and found more fluid around the top. But the resevoir is still full. Where is the extra fluid coming from and WHY??!!  EDIT: Changed title for accuracy
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-.-. .- ... .... ..-. .-.. -.-- . .-. The souls of the righteous are in the hand of God, and no torment will ever touch them. Last edited by cashflyer; 11-09-2005 at 06:01 AM.. |
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11-09-2005, 05:21 AM
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When you release the brakes, the system pushes fluid back into the resevoir. I don't think the resevoir should be filled to the top, take a little out and see if that fixes it.
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Donnie Currently Porsche-less..... 
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11-09-2005, 06:20 AM
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I wouldn't fill it past the step on the outside of the resevoir.
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John '69 911E "It's a poor craftsman who blames their tools" -- Unknown "Any suspension -- no matter how poorly designed -- can be made to work reasonably well if you just stop it from moving." -- Colin Chapman |
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11-09-2005, 06:31 AM
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Registered
Join Date: Aug 2003
Location: Manchester, VT
Posts: 403
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Wouldn't/shouldn't the excess fluid pass out the overflow tube and not out the top? Is your overflow tube plugged? Anyone?
Joe
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1973 911 RS replica, Irish Green 1972 BMW 2002 1968 BMW 1600 1965 Triumph TR4A 1961 Land Rover Series 2 88 |
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11-09-2005, 08:08 AM
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Yes it should, could be blocked.
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Donnie Currently Porsche-less.....
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11-09-2005, 08:29 AM
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It's very common for fluid to collect there, the cause of the overflow is 3 fold; initial overfilling, expansion due to heat and pad knockback
The level will drop as the pads wear, you can also use a syringe to remove a litle fluid. BBKs used w/ stock reservoirs exacerbate the issue, because they push so much more fluid.
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | |
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11-09-2005, 11:21 AM
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Diss Member
Join Date: Jul 2002
Location: SC - (Aiken in the 'other' SC)
Posts: 5,020
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If the fluid has risen a very noticable amount then it means you are boiling the fluid but you should notice the pedal turning to mush.
Otherwise: what Bill said...
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- "Speed kills! How fast do you want to go?" - anon. - "If More is better then Too Much is just right!!!" - Mad Mac Durgeloh -- Wayne - 87 Carrera coupe -> The pooch. |
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11-09-2005, 11:28 AM
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'74 Porsche 911 2.7
1969 Porsche 911E 2.0 E
1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
