Page 1 of 2 1 2 LastLast
Results 1 to 10 of 14

Thread: Brake booster vent line question

  1. #1
    Colonel Slate's Avatar
    Join Date
    Apr 2019
    Location
    Ozona Texas
    MVPA
    MVPA?
    Posts
    303
    Thanks
    176
    Thanked 286 Times in 162 Posts

    Default Brake booster vent line question

    My brake booster was changed from long style to short style and when this was done there is a small vent tube coming out of the top of the brake cap. It goes into a larger line that goes up to the air pressure regulator but the line was crimped and not connected to anything. Is the fuel tank vent in the same line? And where should it connect. Reason I'm asking is the brakes started working better when crimp on line was sealed but now engine is dying first at startup and later when engine warms up. Starts right back up but loses power and dies. Any connections between the two?

    Sent from my moto z3 using Tapatalk
    Last edited by gringeltaube; 06-14-2019 at 09:47. Reason: Title

  2. The Following User Says Thank You to Slate For This Useful Post:

    USAFSS-ColdWarrior (06-14-2019)

  3. #2
    Colonel Slate's Avatar
    Join Date
    Apr 2019
    Location
    Ozona Texas
    MVPA
    MVPA?
    Posts
    303
    Thanks
    176
    Thanked 286 Times in 162 Posts

    Default

    And should that line be connected to the air governor, not air pressure regulator, sorry about my terminology.

    Sent from my moto z3 using Tapatalk

  4. The Following User Says Thank You to Slate For This Useful Post:

    USAFSS-ColdWarrior (06-14-2019)

  5. #3
    dumpsterlandingfromorbit! gimpyrobb's Avatar
    Join Date
    Dec 2005
    Location
    Cincy Ohio
    Posts
    27,601
    Thanks
    2,437
    Thanked 8,861 Times in 4,621 Posts

    Default

    Yes that should be the vent line for the brakes and fuel tank. No it should not be crimped. Is it going to the air compressor governor or is it just hooked by the air filter? A pic would help a lot. They are supposed to have a vent cap like the trans and transfer case have.

  6. The Following 3 Users Say Thank You to gimpyrobb For This Useful Post:

    SCSG-G4 (06-14-2019), Slate (06-14-2019), USAFSS-ColdWarrior (06-14-2019)

  7. #4
    Colonel Slate's Avatar
    Join Date
    Apr 2019
    Location
    Ozona Texas
    MVPA
    MVPA?
    Posts
    303
    Thanks
    176
    Thanked 286 Times in 162 Posts

    Default

    Quote Originally Posted by gimpyrobb View Post
    Yes that should be the vent line for the brakes and fuel tank. No it should not be crimped. Is it going to the air compressor governor or is it just hooked by the air filter? A pic would help a lot. They are supposed to have a vent cap like the trans and transfer case have.
    This is the end of line coming out of brake booster that the fluid cap is vented into. When looking at the fuel vent line looks like it is on the passenger side of the air governor in this pic they are not in same line. But my engine didn't start to cut out untill this line was crimped. It was crimped due to a little brake fluid coming out of it and air leaking out whenever brakes where applied. Also I noticed when fuel pump is shut off I hear fuel running into tank from return line, if that says anything. Have changed fuel filters an gaskets.?IMG_20190614_084820164.jpg

    Sent from my moto z3 using Tapatalk

  8. The Following User Says Thank You to Slate For This Useful Post:

    USAFSS-ColdWarrior (06-14-2019)

  9. #5
    Colonel Slate's Avatar
    Join Date
    Apr 2019
    Location
    Ozona Texas
    MVPA
    MVPA?
    Posts
    303
    Thanks
    176
    Thanked 286 Times in 162 Posts

    Default

    Quote Originally Posted by gimpyrobb View Post
    Yes that should be the vent line for the brakes and fuel tank. No it should not be crimped. Is it going to the air compressor governor or is it just hooked by the air filter? A pic would help a lot. They are supposed to have a vent cap like the trans and transfer case have.
    This is where that line comes out of booster. And second pic fuel vent line to pass side of governor on top brake line that's crimped on bottom
    IMG_20190614_090911443.jpg IMG_20190614_090931759.jpg
    Last edited by gringeltaube; 06-14-2019 at 10:34.

  10. The Following User Says Thank You to Slate For This Useful Post:

    USAFSS-ColdWarrior (06-14-2019)

  11. #6
    Colonel Slate's Avatar
    Join Date
    Apr 2019
    Location
    Ozona Texas
    MVPA
    MVPA?
    Posts
    303
    Thanks
    176
    Thanked 286 Times in 162 Posts

    Default

    Opened it back up now I get pressurized brake fluid sprayinging out after brake is pressed.

    Sent from my moto z3 using Tapatalk

  12. The Following User Says Thank You to Slate For This Useful Post:

    USAFSS-ColdWarrior (06-14-2019)

  13. #7
    Colonel Slate's Avatar
    Join Date
    Apr 2019
    Location
    Ozona Texas
    MVPA
    MVPA?
    Posts
    303
    Thanks
    176
    Thanked 286 Times in 162 Posts

    Default

    Ok so brakes had nothing to do with fuel system was hoping for easy fix.

    Sent from my moto z3 using Tapatalk

  14. The Following User Says Thank You to Slate For This Useful Post:

    USAFSS-ColdWarrior (06-14-2019)

  15. #8
    Colonel Slate's Avatar
    Join Date
    Apr 2019
    Location
    Ozona Texas
    MVPA
    MVPA?
    Posts
    303
    Thanks
    176
    Thanked 286 Times in 162 Posts

    Default

    I do have air in the line here and have changed Farrel on pump right there but air won't go away. No leaking anymore.IMG_20190614_100058651.jpg

    Sent from my moto z3 using Tapatalk

  16. The Following User Says Thank You to Slate For This Useful Post:

    USAFSS-ColdWarrior (06-14-2019)

  17. #9
    4 Star General frank8003's Avatar
    Join Date
    May 2012
    Location
    Ft. Lauderdale, Florida
    Posts
    3,925
    Thanks
    2,771
    Thanked 6,193 Times in 2,118 Posts

    Default

    brake venting 1.jpg

    brake venting 2.jpg

    brake vents brakes + fuel tank.jpg

    Master cylinder must be vented to somewhere, even right at the cap even. I vented mine to the dashboard, but that is another story. If it is NOT vented then that MC will fail in short order.
    and..Yes the vent for the MC WAS tyed into the vent for the fuel system by original design on M35A2.
    I was here, had a good time.

  18. The Following 3 Users Say Thank You to frank8003 For This Useful Post:

    Menaces Nemesis (06-16-2019), Slate (06-14-2019), USAFSS-ColdWarrior (06-14-2019)

  19. #10
    Colonel Slate's Avatar
    Join Date
    Apr 2019
    Location
    Ozona Texas
    MVPA
    MVPA?
    Posts
    303
    Thanks
    176
    Thanked 286 Times in 162 Posts

    Default

    Quote Originally Posted by frank8003 View Post
    brake venting 1.jpg

    brake venting 2.jpg

    brake vents brakes + fuel tank.jpg

    Master cylinder must be vented to somewhere, even right at the cap even. I vented mine to the dashboard, but that is another story. If it is NOT vented then that MC will fail in short order.
    and..Yes the vent for the MC WAS tyed into the vent for the fuel system by original design on M35A2.
    This helps a great deal thank you. Now I have to track down my fuel line air leak. When I rev up engine I start to notice little bubbles out of top of some injectors sometimes and then it all accumulates at end of line. HereIMG_20190614_100058651.jpg

    Sent from my moto z3 using Tapatalk

  20. The Following User Says Thank You to Slate For This Useful Post:

    USAFSS-ColdWarrior (06-14-2019)

Page 1 of 2 1 2 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •