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ABS brake fluid change procedure

Discussion in 'Technical Q&A' started by F328GTS/GTB, Jun 21, 2009.

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  1. F328GTS/GTB

    F328GTS/GTB Formula Junior

    May 3, 2005
    517
    France
    Full Name:
    Denis
    #1 F328GTS/GTB, Jun 21, 2009
    I want to change the brake fluid of my 328, which is fitted with ABS.
    Is there any specific things to take care, compared to a non-ABS system ?

    Do you have experience to do it "manually" or with a Bleeder, that can be found at www.motiveproducts.com ?

    Thanks !
     
  2. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #2 No Doubt, Jun 21, 2009
    I prefer the Motive bleeder to do the job by myself, but the traditional 2 man manual brake bleed works as well. The difference for an ABS car is to have the ignition key turned On so that the ABS pump runs as needed to build pressure and move fluid in/out of the pump.
     
  3. Mule

    Mule F1 Rookie
    Owner Rossa Subscribed

    Jun 25, 2003
    3,758
    Alaska
    Full Name:
    Mule
    #3 Mule, Jun 21, 2009
    This is a repeat, but hope it helps. This is what Ferrari of Denver sent me for my 89 328:

    Remove wheels
    Fill brake fluid reservoir
    Turn key on (level should drop)
    Top off reservoir again, almost to the top and leave the key on
    Have a helper sit in the car
    Open the bleed screw on the right rear caliper
    Have helper slowly press the brake pedal, after the pedal drops a couple of inches the pump will start to run and fluid will come out. Helper should hold the pedal at that level so pump will continue to run.
    After approximately ¾ of pint has come out, close the bleed screw.
    Top off reservoir again
    Now repeat the procedure at the left rear caliper
    After both rear calipers have been bled turn the key off and fill the reservoir to the full mark (seam on tank)

    Now bleed the front brakes manually
    Starting at the right front caliper
    Helper should pump the pedal three times then hold it down
    Open the bleed screw until the pedal reaches the bottom, then close the bleed screw (repeat this process 10 times on each front caliper)

    **While bleeding the front calipers watch level of fluid it may overflow before it starts to go down (because accumulator may release stored fluid) also don’t let level get too low there are three chambers in the reservoir and its hard to watch them all. If the front chamber gets to low you will get air in the system.

    After all four calipers are bled turn the key on when the pump motor stops running turn key off
    Pump the brake pedal 50 times to depressurize the accumulator, watch the fluid level so it doesn’t overflow (use a turkey baster or syringe to suck some out if its going to overflow)
    After the accumulator is depressurized the fluid level should be at the top of the reservoir (bottom of the filler neck)
    Turn key on again after pump stops running the fluid level should now be at the max mark (the seam in the reservoir)

    He ended with a parting comment “it’s much easier to watch the reservoir and keep it full than it is to try and get air out of that system”
     

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