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How to bleed brakes??

Discussion in 'The Garage' started by 85mudblazin, Jul 18, 2004.

  1. 85mudblazin

    85mudblazin 1/2 ton status

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    This may sound stupid but how do you bleed your brakes??
     
  2. 84gmcjimmy

    84gmcjimmy 1 ton status

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    Re: How do bleed brakes??

    None of your questions are stupid, there are guys out there that probably don't know how either (I sort of know how, not enough to do it myself though) because I helped my dad do it, but all I did was push the brake in and out when he said...
     
  3. POWERMAD

    POWERMAD 1/2 ton status

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    Re: How do bleed brakes??

    Fill the master cylinder.
    Start at the farthest cylinder from the master.
    Crack the bleeder, have yer buddy push the pedal slowly down,
    Have em tell ya when it is down. close the bleeder.
    do that untill no more air is pushed out.
    Continue on to the next.
    Do not pump the pedal.. That just dissolves air in the fluid.
    and after a bit the air does it thing and spongy pedal.
    How I do it is use a Phenoix injector, no helper, no mess and always works.
    Or the way I used to do it was to just get a pump for the brake fluid jug and pump the fluid from the cylinder to the master. also called back bleeding.
     
  4. backcountry

    backcountry 1/2 ton status

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  5. 85mudblazin

    85mudblazin 1/2 ton status

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    Re: How do bleed brakes??

    ok so what do I do when pushing the pedal?? one says not to pump and the other says to pump the pedal??
    Thanks
    -Chris
     
  6. 84gmcjimmy

    84gmcjimmy 1 ton status

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    Re: How do bleed brakes??

    press it down slowly
     
  7. 85mudblazin

    85mudblazin 1/2 ton status

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    Re: How do bleed brakes??

    just 1 time??
     
  8. 84gmcjimmy

    84gmcjimmy 1 ton status

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    Re: How do bleed brakes??

    until there is no more brake fluid in the line, thats why you need 2 people...
     
  9. 85mudblazin

    85mudblazin 1/2 ton status

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    Re: How do bleed brakes??

    ok so while one person is working the bleeder screw the other works the pedal, then one person opens the bleeder screw 1/4 turn and has the other person push down the pedal slowly then close bleeder screw, do this until there are no bubbles, am I correct??
     
  10. 84gmcjimmy

    84gmcjimmy 1 ton status

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    Re: How do bleed brakes??

    good job /forums/images/graemlins/peace.gif
     
  11. 85mudblazin

    85mudblazin 1/2 ton status

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    Re: How do bleed brakes??

    ok great thanks alot
     
  12. 85mudblazin

    85mudblazin 1/2 ton status

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    Re: How do bleed brakes??

    one more ? I am swaping the rear end so will I need to bleed the front brakes too??
     
  13. 84gmcjimmy

    84gmcjimmy 1 ton status

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    Re: How do bleed brakes??

    you should bleed all of them, but I'm not to sure on that one...
     
  14. POWERMAD

    POWERMAD 1/2 ton status

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    Re: How do bleed brakes??

    no
    unless ya want to
    edit
    if it is overnight deal bleed em all.
    I use hose pliers on the rubber line to pinch it off.
    Isolating the circut.
    Vice grips and a couple of bolts work too.
    Do not pump the pedal.
    Crack the bleeder, call out down.. helper says down when it is down. close bleeder. Call out up.. helper lets off pedal.
    Repeate untill clear fluid comes from bleeder.
    I have done 65,600,987,763,499 brakes that way.
    Now I do the Phenoix injector.
    Helper says yep fluid is comiming in through the master. Stop.
     
  15. thor

    thor 1/2 ton status

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    Re: How do bleed brakes??

    For anyone who does this with any frequency, a preassure bleeder makes it much easier. I made one for under $25.00, works like a charm.
    1. Get a cheap sprayer from your local hardware store, the pump up ones in the garden section.
    2. 6 geet of 1/4" tygon tubing to replace the "wand".
    3. one male and female quick disconnect, and one brass barbed connector 1/4" npt to 1/4" hose.
    4. one piece of 5" x 7" 3/8" plate, drill and tap a hole to 1/4" npt, put the male end of the quick connect here.
    5. a 6" c-clamp
    6. An extra master cylinder gasket, cut the center out.

    With this you simply put a quart or 2 of brake fluid in the sprayer and pump it a dozen or so times. Clamp the plate to the master cylinder (with gasket) NOTE: BE VERY CAREFUL HERE BECAUSE IF THE GASKET ISN'T STRAIGHT BRAKE FLUID WILL GO EVERYWHERE ON THE NEXT STEP! When you plug the quick connect together you will have 20 or so pounds in the brake system, simply open the bleeders (one at a time) as mentioned above until you are getting clean bubble free fluid.
     
  16. backcountry

    backcountry 1/2 ton status

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    Open the hood and check the level of the brake fluid reservoir. Add fluid as necessary to ensure that the level is at the MAX marking of the reservoir. Do not let the reservoir become empty at any time during the bleeding process!

    Bleeding Process
    1. Begin at the corner furthest from the driver and proceed in order toward the driver. (Right rear, left rear, right front, left front.) While the actual sequence is not critical to the bleed performance it is easy to remember the sequence as the farthest to the closest. This will also allow the system to be bled in such a way as to minimize the amount of potential cross-contamination between the new and old fluid.

    2. Locate the bleeder screw at the rear of the caliper body (or drum brake wheel cylinder.) Remove the rubber cap from the bleeder screw – and don’t lose it!

    3. Place the box-end wrench over the bleeder screw. An offset wrench works best – since it allows the most room for movement.

    4. Place one end of the clear plastic hose over the nipple of the bleeder screw.

    5. Place the other end of the hose into the disposable bottle.

    6. Place the bottle for waste fluid on top of the caliper body or drum assembly. Hold the bottle with one hand and grasp the wrench with the other hand.

    7. Instruct the assistant to "apply." The assistant should pump the brake pedal three times, hold the pedal down firmly, and respond with "applied." Instruct the assistant not to release the brakes until told to do so.

    8. Loosen the bleeder screw with a brief ¼ turn to release fluid into the waste line. The screw only needs to be open for one second or less. (The brake pedal will "fall" to the floor as the bleeder screw is opened. Instruct the assistant in advance not to release the brakes until instructed to do so.)

    9. Close the bleeder screw by tightening it gently. Note that one does not need to pull on the wrench with ridiculous force. Usually just a quick tug will do.

    10. Instruct the assistant to "release" the brakes. Note: do NOT release the brake pedal while the bleeder screw is open, as this will suck air back into the system!

    11. The assistant should respond with "released."

    12. Inspect the fluid within the waste line for air bubbles.

    13. Continue the bleeding process (steps 11 through 16) until air bubbles are no longer present. Be sure to check the brake fluid level in the reservoir after bleeding each wheel! Add fluid as necessary to keep the level at the MAX marking. (Typically, one repeats this process 5-10 times per wheel when doing a ‘standard’ bleed.)

    14. Move systematically toward the driver – right rear, left rear, right front, left front - repeating the bleeding process at each corner. Be sure to keep a watchful eye on the brake fluid reservior! Keep it full!

    15. When all four corners have been bled, spray the bleeder screw (and any other parts that were moistened with spilled or dripped brake fluid) with brake cleaner and wipe dry with a clean rag. (Leaving the area clean and dry will make it easier to spot leaks through visual inspection later!) Try to avoid spraying the brake cleaner DIRECTLY on any parts made of rubber or plastic, as the cleaner can make these parts brittle after repeated exposure.

    16. Test the brake pedal for a firm feel. (Bleeding the brakes will not necessarily cure a "soft" or "mushy" pedal – since pad taper and compliance elsewhere within the system can contribute to a soft pedal. But the pedal should not be any worse than it was prior to the bleeding procedure!)

    17. Be sure to inspect the bleeder screws and other fittings for signs of leakage. Correct as necessary.

    18. Properly dispose of the used waste fluid as you would dispose of used motor oil. Important: used brake fluid should NEVER be poured back into the master cylinder reservoir!
     
  17. js4x4

    js4x4 1/2 ton status

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    they sell bleeder kits, its a small cup with 2 lines in it, and a hose to run up to the bleed valve on the caliper. I've used them and its nice cuz ya don't need a 'helper' you just need to make sure you don't let the cup run dry. I bought one, where its at now I dunno, but think it cost like, 7 bucks. It allows you to push down on the pedal to expel air/fluid, but when you let up on the pedal it will only allow fluid in...not air. I've also gotten a quart size jar and just dropped a hose from the bleeder valve to the bottom of the jar 1/2 full of brake fluid...works, but they were still a bit spongey when i was done (not prefered IMO, but works in a bind) Hope that helps
     
  18. POWERMAD

    POWERMAD 1/2 ton status

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    [ QUOTE ]
    7. Instruct the assistant to "apply." The assistant should pump the brake pedal three times, hold the pedal down firmly, and respond with "applied." Instruct the assistant not to release the brakes until told to do so.



    [/ QUOTE ]
    Do not pump the pedal
    That airieates(sp) the fluid.
    Air will become dissolved in the fluid.
    I can't state that enough.
    Once it settles it becomes one big pocket again.
    Spongy pedal.
     
  19. or2play

    or2play 1/2 ton status

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    Pretty much covered. I'd recommend taking to a shop and have them power bled. Cost me like 25 bucks at a tire shop. Mabey its just me but bleeding brakes is one of those things a can't stand anymore.
     
  20. POWERMAD

    POWERMAD 1/2 ton status

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    Case in point..
    Today a guy installed a new clutch slave cylinder, same smell different flavor.
    2 hrs later and 3 quarts they finaly asked me.
    How in the [darn] do ya do this?
    Hmm Phenoix injector 10 minutes and done.
    I listened to down and up for three hrs LOL
    WTF it aint my effieciency on the line. I told em at the start how to do it.
    But bein an old dude why listen to me? LMAO
     

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