No fluid coming out of master cylinder to the rear brakes

Discussion in 'The whoa and the sway.' started by 00kidd, Nov 19, 2017.

  1. Mark Demko

    Mark Demko Well-Known Member

    X22
    Replacement boosters usually come with two rod lengths.
     
  2. DasRottweiler

    DasRottweiler -BuickAddict-

    X3, my master came with several rods, matched old rod up with a new one of same length, installed, then gravity bleed for several hours while mowing the lawn. Kept an eye on the reservoir , made sure it was topped off and didn't run dry. Then proceeded to bleed brakes as usual.
    Everything in my brake system was new and bone dry, so the gravity bleed was a necessity. JIM
     
  3. Smartin

    Smartin antiqueautomotiveservice.com Staff Member

    I had same problem on my rears. Larry's suggestion to depress the button on the hold off valve was my answer. Also, There is a brake HOSE at the rear of the car that can become completely blocked. Replace that. Or at the very least, disconnect the brake line before the hose and see if you have fluid there.
     
  4. gstewart

    gstewart Well-Known Member

    Usually the splitter hose at/for the rear brakes will weaken and collapse or over expand over time which reduces the effectiveness of the rear brakes.
     
  5. DasRottweiler

    DasRottweiler -BuickAddict-

    He listed all the items he bought and installed new. The rear splitter hose was/is on his list. I'm thinking c-clamp the hold off at the front of the proportioning valve and gravity bleed that stubborn mule.....Jim
     
  6. Smartin

    Smartin antiqueautomotiveservice.com Staff Member

    Ah...that's what I get for not reading everything. Thanks Rott. Push that button!
     
  7. DasRottweiler

    DasRottweiler -BuickAddict-

    NP, Have a Happy Thanksgiving. ....Jim
     
  8. GSX 554

    GSX 554 Gold Level Contributor

    Unless I read this post wrong he says he isn't getting ANY fluid out of the port on the Master Cylinder that goes rearward .. So that rules out the Prop valve and rear hose.
     
  9. CJay

    CJay Supercar owner Staff Member

    Yeah, that's why I told him to bleed it at the master while its on the car. Use the flare nut fitting as a bleeder screw
     
  10. Smartin

    Smartin antiqueautomotiveservice.com Staff Member

    That is weird. In that past, with the older Buicks I have worked on, when I don't get fluid, the brake pedal is depressed just enough to cover the port in the MC. I vacuum bleed everything. So I always make sure the brake pedal is up all the way...then pull a vacuum.

    Now that I have actually read the original post and not the replies, it appears there is something going on with the rod length or the location of the brake pedal.
     
  11. chrisg

    chrisg Silver Level contributor

  12. CJay

    CJay Supercar owner Staff Member

  13. chrisg

    chrisg Silver Level contributor

    Well, geez, I need to take a reading comprehension course. Since I saw all the postings telling him to check lines and the combination valve and such, I thought he had gotten past the part where he wasn't getting any fluid out of the rear port of the MC. In my case, I was getting fluid out of the MC, but not out of the combination valve to the rear brakes. Tried everything mentioned here, including a new combination valve, gravity bleeding, and pressing the button on the valve. The only thing that worked for me was the reverse bleeding. Might even still work for the OP since it blows all the way through the MC.
     
  14. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Why don't we wait until he gets back to us?
     

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