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Thread: Vacuum Bleeding Brakes

  1. 29th January 2019, 07:58 PM #1
    Lionelgee
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    Vacuum Bleeding Brakes

    Hello All,

    Can someone please confirm if the order of bleeding brakes with a vacuum bleeder is different to, or the same as with a pressure bleeder? For example, starting at Passenger side rear, driver side rear, passenger front and finishing on driver front for a pressure bleeder? This equals working from furthest point to closest point to master cylinder.

    When I pressure bled the system it held pressure with no fluid loss for well over 3 hours. I have since parked the Shortie for a couple of months. Yesterday, I noticed the same tell-tale leak from inside the driver's side rear wheel rim The fluid then forms a tear-drop shape on the bottom-front side of the tyre. Unless my dog's or the possums are marking their territory with brake fluid; it looks like I have a reoccurring brake fluid leakage that is very gradual over a period of time.

    The only thing I can think of since the brake pipes, flexible hose and brake wheel cylinders are new is that the three way junction over the rear axle is faulty and needs to be replaced. All the replaced brake wheel cylinders were new TRW OEM. Therefore, they should be "reasonable quality" parts. It is an external to the brake drum leak too. Take the drum off and everything is dry inside.


    Kind regards
    Lionel
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  2. 29th January 2019, 10:08 PM #2
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    1950landy
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    You havn't lost the copper washer or used the old one were the flexable hose screws into the 3way junction. Also did the new pipes have bouble or single flare's they should be single . If single have been used they will not tighten proply.
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  3. 30th January 2019, 11:07 AM #3
    Grappler
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    Get an accomplice to push hard and continuous on the pedal while you look underneath for leaks in the system

    Also when vacuum bleeding Ive found air gets sucked in from the back of the thread on the bleed nipple. Its hard to tell if the bubbles are from the system bleed or from the nipple. Ive read you can put thick grease around the base of the nipple thread to stop air sucking in. I usually vacuum first then finish conventionally. I use the same sequence. (furthest to closest from master)
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  4. 30th January 2019, 11:57 AM #4
    Red90
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    Use a pressure bleeder. Vacuum bleeders are a serious PITA.
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  5. 30th January 2019, 12:55 PM #5
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    1950landy
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    I have a pressure bleeder that works off tyre pressure but a mate talked me into buying a vacuum bleeder ," WHAT A WAIST OF MONEY" , just kept sucking air in around the bleed nipple thread. & ended up with brake fluid everywhere.
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  6. 30th January 2019, 02:16 PM #6
    Timj
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    Are you sure it's brake fluid? I bought new parts and pulled everything apart only to find out that it was actually a leaking hub seal.
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