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| Ready to Give Up on Darts... https://slantsix.org/forum/viewtopic.php?t=18629 |
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| Author: | Slanted Opinion [ Mon Jul 17, 2006 5:58 pm ] |
| Post subject: | Ready to Give Up on Darts... |
After not driving my 68 Dart since March (brake troubles, no time to fix with crazy schedule) I finally had time to put in a new (rebuilt) master cylinder this evening. The problem is, it won't bench bleed! I spent well over an hour on it, one stroke every 10 seconds or so, and STILL have air coming through the recirculating tubes. The master is a "Fenco" rebuild, I think. I'm guessing that in some manner the replacement master must be bad. Perhaps it is drawing in air along the piston shaft seal... I don't know. But I do know that my faithful old Dart (which was scheduled for some minor bodywork and paint this August) is rapidly becoming a liability rather than an enjoyment. This car IS (supposed to be) my daily driver. I need both encouragement (I'm ready to sell it and buy a used Honda) and a technical solution... anyone up for both? Thanks- Mac |
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| Author: | Jeb [ Mon Jul 17, 2006 6:08 pm ] |
| Post subject: | |
Are the brake bleeding plugs airtight? They can have a tiny leak and suck air back into the master cylinder when the piston is released. |
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| Author: | SlantSixDan [ Mon Jul 17, 2006 6:29 pm ] |
| Post subject: | Re: Ready to Give Up on Darts... |
Quote: new (rebuilt) master cylinder
Remanufactured ≠ new.Quote: The problem is, it won't bench bleed! I spent well over an hour on it, one stroke every 10 seconds or so, and STILL have air coming through the recirculating tubes.
Assuming, as has been posted already, that the bleeder fittings were threaded in properly, the odds are you got a bad "remanufactured" master cylinder.Remanufactured parts, especially for old cars, tend to be much more problematic than new ones or genuinely-rebuilt ones ("rebuilt" means a skilled craftsman does the job on a workbench...such parts do not come from the parts store). What brake system do you have? 9" drum, 10" drum, disc? |
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| Author: | Slanted Opinion [ Tue Jul 18, 2006 5:16 am ] |
| Post subject: | |
Hello Dan, 9" Drums all the way around. It is slated for a disc upgrade, and I have a donor all lined up, but I need to get it running (or stopping  ) so I can get it to VT where I can do the swap. And yes, remanufactured parts are frustrating!  -Mac |
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| Author: | Dart270 [ Tue Jul 18, 2006 6:54 am ] |
| Post subject: | |
I agree on the possible bleeder line leak. Tapping MC with a hammer while benching can help loosen up trapped bubbles. Lou |
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| Author: | Slanted Opinion [ Tue Jul 18, 2006 3:37 pm ] |
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This may be interesting... In the bleeding process I have not observed the fluid ever returning back into the master (through the clear looped tubes) as the brake pedal is released. Shouldn't I see some backflow as the pedal comes up? Still about 95 degrees here in Boston, so the master cylinder may have to wait until tomorrow night for an air-leak check on those bleeder lines. -Mac |
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