no breaks 83 J10 jeep truck

Discussion in 'Other Trucks' started by TIC, Mar 6, 2016.

  1. TIC

    TIC Full Member

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    i have very little brakes. i replaced the rear shoes, wheel cyl., had drums turned. still no brakes they wont bleed, constant air comeing through. traced brake lines back to master cyl. no leaks, bought one of those hand pump bleeders, it works realy good but air keeps coming. is it posible its leaking into the brake booster? the level in the resivoir dont drop. is it possible its sucking air through the plunger assembly? the peddle is hard, if you push real hard on the peddle the right rear will lock and you go slideing through the intersection, my wife dont like it.:help:
     
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  2. chevychase

    chevychase Semi-Admin
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    If it is leaking into the booster..will smoke a bit..while pumping brakes..also might show up in the floor board.under the mat.
    If you keep getting air..something is sucking air..or master cylinder is bad...bypassing.
     
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  3. TIC

    TIC Full Member

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    it must be the m/c were else could the air come from. im gonna take it loose from the booster tomorrow and see if there is any wet or dripping going on. i priced one at O'riely's 30 bucks.
     
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  4. chevychase

    chevychase Semi-Admin
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    I have been through this ordeal a few times..change lines..etc. pump on a already .almost wore out MC..finish it off.
    Gravity bleed etc...found Mc was bad..after i was sick of brakes bleeding.
     
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  5. TIC

    TIC Full Member

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    theres nothing i despize more than bleeding brakes, i took the m/c loose from booster, it was dry around plunger area, im gonna try bleeding the front see what happens.
     
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  6. MrMarty51

    MrMarty51 Full Member

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    One thing that comes to mind.
    When using a vacuum pump to bleed the brakes, remove the bleeder screw, put a slight amount of teflon tape around the threads, Air leaks past the threads, makes it appear like something is severely wrong. It could still be sucking past the M.C. but, at least this simple step will eliminate one of the possibilities.

    PS; thread goo dont work so good, air will suck right around it.
    Also, while the bleeders are removed, be sure to clean out the passages, if new, make sure they are clean.
     
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  7. TIC

    TIC Full Member

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    yes ive had to do that in the past, but this pump i got from harbor frieght has these different size boots, like spark plug boots, they fit over bleeder right up against the back of the wheel cyl. plus i held it tight with my finger. best bleeder i ever had. im going down and get a new m/c today.
     
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  8. chevychase

    chevychase Semi-Admin
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    When i bleed brakes..i get a bottle..fill half full with fluid..i use a clear tubing that fits snug over the bleeder...stick tube down in bottle..to bottom..get in truck pump..pump..this way no way air can get back in.
     
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  9. TIC

    TIC Full Member

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    yes that pump i got has the bottle and clear tubes it also has a vacume gage, while the bleeder was open i could still pump 40 lbs of vacume
     
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  10. MrMarty51

    MrMarty51 Full Member

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    40 pounds of vacuum ? thats a might lot of vacuum. Sea level could be to 33{ give or take a inch or two} inches of vacuum though. Might also depend on the baro pressure.
     
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