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  • #16
    There is a downside to gravity bleeding, all that dirty old contaminated brake fluid that is in the abs actuator/motor is still there. Gravity does not have the power to purge/change what's stored there. IMO pneumatic pressure bleeding is the only way to bleed brakes now a days, even if you require a scanner hooked up in brake bleeding mode it can normally be bypassed through pressure bleeding. Also would never use the old pump/hold it down technique as have witnessed too many master cylinder related issues afterwards caused by the piston travelling past its normal travel inside the master.
    One of the main reasons brake fluid is changed apart from what ####'s said is to stop your brakes from corroding inside out, hence why brake fluid is hygroscopic, it absorbs the moisture/water content that finds its way into the hydraulic system, hence most manufacturers recommend bi-annual or annual change out of brake fluid.

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    • #17
      Originally posted by sunny120 View Post
      There is a downside to gravity bleeding, all that dirty old contaminated brake fluid that is in the abs actuator/motor is still there. Gravity does not have the power to purge/change what's stored there. IMO pneumatic pressure bleeding is the only way to bleed brakes now a days, even if you require a scanner hooked up in brake bleeding mode it can normally be bypassed through pressure bleeding. Also would never use the old pump/hold it down technique as have witnessed too many master cylinder related issues afterwards caused by the piston travelling past its normal travel inside the master.
      One of the main reasons brake fluid is changed apart from what ####'s said is to stop your brakes from corroding inside out, hence why brake fluid is hygroscopic, it absorbs the moisture/water content that finds its way into the hydraulic system, hence most manufacturers recommend bi-annual or annual change out of brake fluid.
      +1
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      • #18
        Originally posted by adrian5800 View Post
        +1
        I just replaced my whole ABS unit, master cylinder, ABS pump etc. I was nervous that I wouldnt be able to get all the air out when installing the new unit. To my surprise, bleeding the old fashioned way worked just fine, with the exception that I needed to have the engine running to get the ABS pumping. Brakes are as good as ever.

        I spoke with a few brake shops re how to extract air stuck in ABS systems. They said get it as good as you can, then go find some gravel roads, lock up the brakes to get the pump working, then bleed again. I didnt have to do this, but was good to know.

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