97 Suburban - New master cylinder - bleeding technique

Discussion in 'Lifted & Offroad Suspension' started by getawaycars, Nov 24, 2010.

  1. getawaycars

    getawaycars New Member

    I have to install a new master cylinder on my 97 Suburban K1500 4x4 with ABS. If I bench bleed the m/cyl before installing and bleed the fittings while installing, should i have any issues with the ABS (such as bleeding the ABS unit?)

    I know how to bleed the lines at the wheels but have never touched the ABS. If the abs needs service, are special tools needed?

    Any thoughts would be appreciated.
  2. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    Only a GM Dealer has the tools to properly bleed the 96-99 Gm trucks, Sadly. There have been a few people to ask this question and it has been the same answer every time in that reguard.
  3. stephan

    stephan Rockstar 4 Years 5000 Posts

    It kind of depends on how lucky you are. Since your ride has ABS, the GM Tech 2 bleeder is required to get all the air out of the ABS, but some have been sucessfull by bench bleeding the master first. If you can get the master completely bled & don't lose any fluid out of the lines so no air enters them, then you might get by without the GM bleeder. The problems begin when you try & bleed them afterwards because any air that is left in the master or has entered the disconnected lines enters the ABS & you can not get it out without the GM Tech 2 bleeder, & they charge near $100. for the bleed. If you have a good pedal (not mushy, spongy, or soft & correct height) after you have the master reinstalled, try forgoing the bleed for a while as you will just pass any air that is in it, into the ABS & then you WILL need to take it to GM for the bleed.
  4. getawaycars

    getawaycars New Member


    With thorough bench bleeding and careful installation, I was able to install the master cylinder and I now have a good pedal.

    Thanks for the info above.

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