1. #1

    CJ- Got air in my brake lines while wheeling..suggestions?

    Hello, Last time I went 4 wheeling I managed to get air in my brake lines. Desending back to the road was sketchy . Could brake fluid sloshing in the master cylinder be the cause? Does this sound plausible? Has it happened to anyone else? If so, does anyone have a fix or maybe a mastercylinder upgrade they could recommend?

  2. #2
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    6,270

    Re: CJ- Got air in my brake lines while wheeling..suggestions?

    Usually there is not enough room to shosh and allow the air to reach the opening. Unless you flip or roll.


    How do you know you have air in the lines?


    Never look down on anyone unless you are helping them up - Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  3. #3

    Re: CJ- Got air in my brake lines while wheeling..suggestions?

    Low on brake fluid ?? I'd carefully inspect all the lines for leaks.

  4. #4

    Re: CJ- Got air in my brake lines while wheeling..suggestions?

    I first noticed the pedal being spongy as we desended back to the main road. I bled the brakes when I returned home and did find air in the lines. Since then I have put many miles on it and have had no issues or puddles in the garage. Im pretty sure that the day I went wheelin I checked the master cylinder for fluid level and all was well. just occured to me that I have not checked the condition of the seal on the master cylinder lid. Maybe thats it? Thanks for answering

  5. #5
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    6,270

    CJ- Got air in my brake lines while wheeling..suggestions?

    Was it hot and you were heavy on the brakes and often???
    Brakes are a sealed system. Nothing out nothing in. The lid if not sealing will let air and moisture in reducing the boiling point of the fluid causing more bubbles in the lines when worked hard. Its called brake fade. If it sloshed out that is bad and needs to be repaired.
    Also lids typically have a rubber seal that expands in as brake pads wear and draws more fluid in.


    If air was let in on a regular basis I would bleed out all the old fluid. Moisture is killer and can cause multiple issues.

    Do check the lines for pinches or kinks. They are fatal to brake systems.



    Never look down on anyone unless you are helping them up - Jesse Jackson
    Last edited by JPNinPA; 10-29-2021 at 01:43 AM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  6. #6
    Join Date
    Apr 2003
    Location
    Pembroke Pines, FL
    Posts
    334

    Re: CJ- Got air in my brake lines while wheeling..suggestions?

    Is your proportioning valve on the frame? If you have headers might be too close to it, might have caused a leak. Just a thought, but lots of places there could be a leaky connection.


    Sent from my iPad using Jeepz.com mobile app

  7. #7

    Re: CJ- Got air in my brake lines while wheeling..suggestions?

    Thanks Ya'll for your input.. I will re-inspect all my connections this weekend, and yes it was very very hot here on the day it happened and I was on the brakes alot. The brake fade theory fits well.

  8. #8
    Join Date
    Feb 2009
    Location
    Dayton Ohio Area
    Posts
    6,270

    Re: CJ- Got air in my brake lines while wheeling..suggestions?

    FYI
    How to Test Brake Fluid - YouTube


    Never look down on anyone unless you are helping them up - Jesse Jackson
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

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