Weird rear brake problem - Mondial T/348 | FerrariChat
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Weird rear brake problem - Mondial T/348

Discussion in 'Technical Q&A' started by nc_newbie, May 18, 2008.

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  1. nc_newbie

    nc_newbie Rookie

    Nov 4, 2003
    20
    #1 nc_newbie, May 18, 2008
    I just finished an engine out major and have started to drive the car. Anyway as I continue to check everything out I found a problem. No rear brakes. The pedal and front brakes work perfect. The left rear bleeds like expected. No Brakes on the left rear though? The right rear is getting no fluid. Pulled the right rear caliper and it is not stuck and is smooth. Pumped the brakes with the right rear line disconnected from the Caliper and no fluid.

    I think I know the problem. There is some kind of valve (check valve? - but then once you put brakes on they would turn loose?) that goes in the brake line between the master cyclinder and the left rear. I opened it up to disconnect the brake lines when pulling the engine. I am not sure what this valve is. Ideas and does anyone have an exploded diagram of it to see if I put it together wrong?

    Still the left and right rear brakes just T off the same line? I am thinking the valve is only letting a little fluid in... comments welcome?
     
  2. nc_newbie

    nc_newbie Rookie

    Nov 4, 2003
    20
    #2 nc_newbie, May 18, 2008
    I pulled the valve off that I suspected as the problem then pumped the brakes - no fluid to the back of the car. Looking at the brake diagram in the service manual that valve is the "Breaking force regulator" and it is feed directly from the master cyclinder. I guess it has to be the master cyclinder. That looks like a lot of work. Anyway to be sure before jumping in to it?

    Is their anyway the ABS system could interfere with just basic fluid nd brake operation with the key and engine off?

    Thanks in advance...
     
  3. stavri

    stavri Karting

    Jul 20, 2006
    95
    Bucks County, PA
    #3 stavri, Jun 20, 2008
    Did you solve this. I have a similiar problem. After an engine out belt change on the TR I am not getting fluid to the rear?? any ideas??

    Stavri
     
  4. ferrarilou

    ferrarilou Formula Junior

    Apr 13, 2004
    513
    US
    Full Name:
    Lou Menditto
    #4 ferrarilou, Jun 20, 2008
    On the Mondial-T, the brake reservoir also feeds the clutch slave cylinder. Are you sure you hooked that back up correctly and don't have any leaks? My old Mondial-T actually had a casting defect in the gearbox housing and was leaking fluid into the gearbox - a Ferrari DIY saint reworked the system for me to bypass the failed area. I would hope this failure was extremely rare so I'm not saying you have the same issue.

    I've heard it can be hard to bleed all air out of the system. Someone once recommended jacking up the back of the car to bleed the clutch hydraulics, but I don't have any direct experience with that.


    Lou
     
  5. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
    72,740
    Vegas+Alabama
    Full Name:
    Mr. Sideways
    #5 No Doubt, Jun 21, 2008
    To get fluid out of my rear calipers, I turned the ignition key to Position II (Run, not Start) with a Motive powerbleeder pumped up to 14psi and connected to the master reservoir.

    I opened one of the two bleed nipples on the right rear caliper, and then I had to pump my brake pedal a few times until I heard the ABS pump kick on (hence, why it is important to have the key on).

    After that, plenty of brake fluid out of all nipples on all calipers!
     
  6. fatbillybob

    fatbillybob Two Time F1 World Champ
    Consultant Owner

    Aug 10, 2002
    29,252
    socal
    #6 fatbillybob, Jun 21, 2008
    It was the saint.







    stavri,

    try this but timing is everything. you need a friend at the brake pedel. You tell him to pump the brake fast in 1/2 second intervals and he counts out loud 1-2-3-4-5-6 as he pumps the brakes. Then he hold the pedel to the flor at 6 and you open the bleeder 1/4 a turn for 1 second then cut it off and the air and fluid will shoot out fast. He lets up the pedel and Repeat this until very little air comes out. Now bleed two man convensionally. What this does is move trapped air by getting the fluid moving like rocking your car out of the snow reverse/first gear reverse/first gear. Get it?
     
  7. ferrarilou

    ferrarilou Formula Junior

    Apr 13, 2004
    513
    US
    Full Name:
    Lou Menditto
    #7 ferrarilou, Jun 21, 2008
    Yes, and there are none better. I'm still very grateful. Thanks again.


    Lou
     

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