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''Another new master cylinder leaking again...darn junk

Discussion in 'Truck & Equipment Repair' started by welded wrenches, Feb 3, 2011.

  1. welded wrenches

    welded wrenches Senior Member
    Messages: 177

    Several new mastercylinders on 78 chevy k10 and they ALL LEAK fluid from the cover.these are metal type master cylinders.after buying from 3 differnt places,a fews later they all leak.Im sure you be so happy also.NOT !! Who make a good one..thats the question.I suppose the next i ask for..Im going to say ...how much to RENT a master cylinder..because you will be getting it returned in a few weeks!
  2. sweetk30

    sweetk30 PlowSite.com Addict
    Messages: 1,588

    metal masters weap fluid from the cap area a lot if you ask me.

    if you wana try somthin diffrent might have to change the nuts on the lines but order a mid 80's master. thay went to aluminum/plastic by then.
  3. Mark Witcher

    Mark Witcher Senior Member
    Messages: 605

    Are you sure its coming from the cover? I have several older chev and havent had a problem with covers leaking.
  4. welded wrenches

    welded wrenches Senior Member
    Messages: 177

    all 3 chevys have new masters and..

    and all 3 chevys have them metal type master cylinders and they ALL LEAK..it dont matter where they are purchase from..the end story is i guess is INFERIOR RUBBER,low grade,piss poor quality ..just look around a bit...junky rubber wiper blades,junky wheel cylinders ,junky rubber tires. all inferior junk rubber..im just so happy...NOT !!:realmad:
  5. sweetk30

    sweetk30 PlowSite.com Addict
    Messages: 1,588

    the new master i put on my 79k30 thats metal few years ago i brake cleaned off everything and watched it get all damp in less than 10 min from the top/under cap all the way down the sides.

    i said screw it. top it off every few months. as i hardly drive it these days any way.
  6. MickiRig1

    MickiRig1 PlowSite Veteran
    Messages: 3,617

    Try making a thicker gasket? Like out of inter-tube rubber? Clean the cap real well and use the blue gasket goop to make a gasket? Let it dry for 24 hours before installing.
  7. sweetk30

    sweetk30 PlowSite.com Addict
    Messages: 1,588

    most gasket maker stuff for engines will swell up and peal right off with brake fluid.