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Technical Brake Bleeding problem

Discussion in 'The Hokey Ass Message Board' started by hath, Jan 1, 2019.

  1. hath
    Joined: May 23, 2017
    Posts: 25

    hath

    Hi everyone,

    Need your help. I'm running an electric brake system from abspowerbrake.com and can't get the brakes to bleed properly. You're supposed to bleed the front, then the rear, and finally the electric pump. The first time I did it I had success with all four wheels, but once I bled the electric pump, I lost brakes. Now I'm not getting any fluid to the fronts. I cleared those lines out (they were not plugged). Not sure what to do. I suspect a seal in the MS is bad even though I just rebuilt it. What do you think? I've attached the instructions from the manufacturer and a link if it didn't work (click first instruction sheet). http://abspowerbrake.com/product.php
     

    Attached Files:

  2. boring-hop-yard
    Joined: Feb 24, 2008
    Posts: 74

    boring-hop-yard
    Member

    Did you bench bleed the master before it was installed?
    Was the master working before you rebuilt it?
     
  3. Mr48chev
    Joined: Dec 28, 2007
    Posts: 26,736

    Mr48chev
    ALLIANCE MEMBER

    I read the instructions about three times and can't figure out exactly where you were supposed to bleed the pump but it would have to be at the return port at the master cylinder to get air out of the line meaning you cracked the fitting open while it was pumping until you didn't see air bubbles. Kind of a maybe I got it maybe I didn't setup.
     
  4. boring-hop-yard
    Joined: Feb 24, 2008
    Posts: 74

    boring-hop-yard
    Member

    Instructions are not very robust.
    Seems to me its just like any other master install until the pump and accumulator.
    I would bench bleed, install and then bleed at the wheels, do the pump and accumulator instruction then followed by bleeding the complete system again since the pressure side has been opened by adding the accumulator.
    not sure how you would remove the air induced after the accumulator is added without bleeding.
    I would also go through to extra effort and install the bench bleed lines again and verify I had clean brake fluid before I call my trusty wife to do the down up procedure since she has a yearly limit on how many times she will help bleed brakes. Hope this helps.
     
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  5. BJR
    Joined: Mar 11, 2005
    Posts: 6,295

    BJR
    Member

    Have you called abspowerbrake? They must have a tech line.
     
    Frankie47 likes this.
  6. Frankie47
    Joined: Dec 20, 2008
    Posts: 1,727

    Frankie47
    Member
    from omaha ne.

    Seems a little street roddy to me.
    [​IMG]
     
  7. Happydaze
    Joined: Aug 21, 2009
    Posts: 927

    Happydaze
    ALLIANCE MEMBER

    As far as I can tell this isn't a regular master cylinder as it has a feed to the pump and a pressurised feed back to the master which somehow provides internal assistance to the existing pedal effort. The bleeding of the brakes in a regular fashion plus the claim that the brakes work normally (but without powered assistance) in the event of a pump failure suggests to me there's no hydraulic connection between the brakes themselves and the powered assistance. That being the case there has to be some sealing arrangement internally?

    If my assessment is correct this isn't simply an addition of a power system to an existing master, but the installation of a complete system, including special master. If that is true I am perplexed as to why the master needed to be rebuilt., unless of course this isn't a new install. But given the specialist nature of the system I'd have thought this would be a call to the manufacturer?

    I could of course have it all wrong!

    In the right application the remote electric pump seems simple than the engine driven hydroboost things.

    Chris
     
  8. hath
    Joined: May 23, 2017
    Posts: 25

    hath

    So the MS was working before I ran all new lines. I put it all back together, bled it, but my pedal would go to the floor if I kept constant pressure on it. That to me meant the seals were no longer sealing inside the cylinder so I ordered a rebuild kit and installed it. That initially gave me the pedal pressure I thought I needed after bleeding all four corners, but prior to bleeding the pump. Now you got me second guessing if I really needed a rebuild, if what I really needed to do was bench bleed the MS, which I didn't do.
     
  9. hath
    Joined: May 23, 2017
    Posts: 25

    hath

    I did talk to them, I talked to Eddy. He said I needed to disconnect the rear most line on the MS (which comes from the electric pump) and connect a little tubing to it and route it to the filler port, turn the key on and let the pump run. This allows the system to circulate and burp out any air that might be remaining. If that didn't work, he said to start the whole process over again. I'm also confused because the instructions don't talk about bleeding the accumulator...I kind of feel like it's one big balloon in my brake system.
     
  10. hath
    Joined: May 23, 2017
    Posts: 25

    hath



    Yes very street roddy and goddy. This system came with the truck...the MS is gargantuan and ugly!
     
    Frankie47 likes this.
  11. hath
    Joined: May 23, 2017
    Posts: 25

    hath

    Yes it was an existing brake system that came with the truck. It's one of their older versions (10-65) and it had tons of gunk inside the MS. I believe the system was at least 10 years old. The seals between the cylinder and the reservoir were dry rotted and cracking.
     

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