609albert Posted June 8, 2009 Share Posted June 8, 2009 have a 47 mack ls85 did soon brake work and about ready to bleed air from system. on some of the bleeder I notice a plug about 7/16 with female threads on it like another fitting screws into it. Is something missing ? any suggestion how to loosen thoses plugs up, they feel like they are frozen to the wheel cylinder . thanks guy's Quote Link to comment Share on other sites More sharing options...
Rob Posted June 8, 2009 Share Posted June 8, 2009 have a 47 mack ls85 did soon brake work and about ready to bleed air from system. on some of the bleeder I notice a plug about 7/16 with female threads on it like another fitting screws into it. Is something missing ? any suggestion how to loosen thoses plugs up, they feel like they are frozen to the wheel cylinder . thanks guy'sHi Albert, any way you can post a photo? I don't think I've ever seen what you describe dealing with the bleeder screws on hydraulic brakes.Thanks,Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
Greg Rider Posted June 8, 2009 Share Posted June 8, 2009 A good clear picture would be great. I am bleeding the brakes on my A-30 and I can't wrap my brain around what you describe. The bleeder screws on my truck look like regular bleeders only larger. There is an upper and lower and they take a 7/16 wrench. Quote #1 on A-model registryIf I drink because of work, why can't I drink at work? Link to comment Share on other sites More sharing options...
609albert Posted June 11, 2009 Author Share Posted June 11, 2009 A good clear picture would be great. I am bleeding the brakes on my A-30 and I can't wrap my brain around what you describe. The bleeder screws on my truck look like regular bleeders only larger. There is an upper and lower and they take a 7/16 wrench. got the last of 4 off today , a liquid blaster penetrating oil ,a little heat and got them all out and cleaned up , ready to replace the last brake hose on the front left wheel. Quote Link to comment Share on other sites More sharing options...
Mike Posted June 11, 2009 Share Posted June 11, 2009 have a 47 mack ls85 did soon brake work and about ready to bleed air from system. on some of the bleeder I notice a plug about 7/16 with female threads on it like another fitting screws into it. Is something missing ? any suggestion how to loosen thoses plugs up, they feel like they are frozen to the wheel cylinder . thanks guy'sAlbert,Those female threads are probably for hooking up a hand bleeder vaccuam pump with guage. Yes we are dew a photo for training purposes only, just incase I incured something else.Thank Youmike Quote Link to comment Share on other sites More sharing options...
609albert Posted June 13, 2009 Author Share Posted June 13, 2009 Albert,Those female threads are probably for hooking up a hand bleeder vaccuam pump with guage. Yes we are dew a photo for training purposes only, just incase I incured something else.Thank Youmike Quote Link to comment Share on other sites More sharing options...
609albert Posted June 13, 2009 Author Share Posted June 13, 2009 yes ...you are correct , the interior threads are for screwing in a vaccuam pump to bleed the system. learn more about this old mack everday!!! Quote Link to comment Share on other sites More sharing options...
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