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Passat brakes. Bleeding method.

  • 26-12-2015 6:42pm
    #1
    Nekarsulm
    Registered Users, Registered Users 2 Posts: 11,264 ✭✭✭✭


    Hi all. Changing the rear disks and pads on my 2001 Passat. The rear drivers side piston refused to wind back in, no matter how I tried. (I had bought a Laser brand tool).
    The passenger side rear wound back no problem. I got a second hand caliper and fitted it. I lost a lot of the fluid from the line, and now with the reservoir filled adain, I can't get the pedal to even pump fluid/air out. Seems to have an airlock in the master cylinder. Do I have to use an Ezi Bleeder type device? Or do I need to pump fluid in from the caliper end?
    Thanks in advance.


Comments

  • #2
    shietpilot
    Closed Accounts Posts: 2,881 ✭✭✭shietpilot


    Sounds like the brake master cylinder is dried.

    Did you bleed all the calipers? There is a specific pattern to bleeding brakes. Generally you bleed the caliper furthest away from the brake master cylinder first, then the second furthest away, then the second nearest and then the nearest.

    If the pedal is staying down you might have to pull it back up after tightening the bleed screw. It will take you a while if there's lots of air in the system and you'll need 2 people.

    If that doesn't work you'll need to bleed the brake master cylinder.


  • #3
    9935452
    Registered Users, Registered Users 2 Posts: 2,835 ✭✭✭9935452


    I had similar problems bleeding out the golf at one stage but not as bad as that.
    Some things i was told was if i kept pumping the brake pedal there was a change of ruining the seals in the master cylinder, there could be scoring/dirt in the inside of the master cylinder which could destroy the seal on the master cylinder. As a result i was advised the best tool for the job is the vacuum tool which sucks the brake fluid from the brake nipple. make sure the brake pedal is up if you ise this
    The other thing is your ABS pump might get airlocked . To clear this would require you to put it on the computer and trigger the ABS pump or activate the abs by standing on the brakes hard.
    What fixed mine in the end was bleeding the nipple on the master cylinder.
    With the engine off i had a good pedal. With the engine on i had none. Bled the master cylinder and off she went , perfect


  • #4
    Nekarsulm
    Registered Users, Registered Users 2 Posts: 11,264 ✭✭✭✭Nekarsulm


    Thanks guys, will have a go at it tomorrow. Had a look today but didn't see any bleed nipple on the master cylinder.


  • #5
    9935452
    Registered Users, Registered Users 2 Posts: 2,835 ✭✭✭9935452


    Nekarsulm wrote: »
    Thanks guys, will have a go at it tomorrow. Had a look today but didn't see any bleed nipple on the master cylinder.
    my 02 golf definitely had one if not two, its over a year ago since i looked at it. There will be plastic caps on it which makes it hard to see.

    http://www.boards.ie/vbulletin/showthread.php?p=73655056


  • #6
    Nekarsulm
    Registered Users, Registered Users 2 Posts: 11,264 ✭✭✭✭Nekarsulm


    Success today. Got master cylinder bled by loosening the two pipes at the ABS block in turn . Still couldn't get rear right brake bled, but it turned out that the bleed screw in the second hand caliper I fitted was blocked. So no wonder I couldn't get fluid out! So all good now. Tomorrow I'll tackle the cracking CV joint.


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