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  1. #1
    Join Date
    Mar 2012
    Location
    South Carolina
    Posts
    772

    Default Trailer master cylinder does not maintain fluid level

    I have a question that I know nothing about.

    I will disclose that in April I bled my brake lines with the help of my dad and refilled. I had to change out a leaky seal which meant repacking all bearings and such.

    For some reason my master cylinder on the trailer tongue is sucking brake fluid, it seems like I have to refill it every time I go out. This worries me because I am driving a 3 hr trip this weekend to camp at J. Strom Thurmond Lake.

    There are no leaks, why would the brake fluid keep emptying?
    2008 Supra 21V
    2,600 lbs., Gravity III
    Z5 Cargo Rack
    Stereo: Pair of Wetsounds Pro 80's, Rockford Fosgate P500-2, Kicker ZX200.4, Exile ZLD, stock Kicker in-cabins, stock Kenwood HU
    Tow rig: 2008 Slate Tundra, Bilstein 5100's (F&R), 295/65/18 wrapped in Duratracs

  2. #2
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    11,208

    Default

    Because there is a leak.
    My Mom said I'm not allowed to get wet!
    2008 LSV
    2000 Outback LS (sold)
    Exile Tunes
    PWI
    LLTR!!!!!!!!



  3. #3
    Join Date
    Jun 2007
    Location
    Vancouver, WA
    Posts
    3,971

    Default

    Second that. I just redid all mine and a new actuator as well. Fluid shouldn't go down at all really unless your pads are wearing and the calipers have to compress further to compensate. But that is more slowly over time. You're definitely losing fluid somewhere.
    Old enough to know better, young enough to do it anyway.

    2001 MobiusV

  4. #4
    Join Date
    Jul 2008
    Location
    Snellville, GA & Lake Sinclair
    Posts
    6,965

    Default

    Quote Originally Posted by kaneboats View Post
    Because there is a leak.


    I only posted the above since you beat me to that reply!
    Drew
    New ride: 2012 Mojo
    Old ride: 2008 OBV

  5. #5
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    11,208

    Default

    That's OK. We're used to you being a little slow. That's why they sent that special short bus for you every day.
    My Mom said I'm not allowed to get wet!
    2008 LSV
    2000 Outback LS (sold)
    Exile Tunes
    PWI
    LLTR!!!!!!!!



  6. #6
    Join Date
    Jul 2008
    Location
    Snellville, GA & Lake Sinclair
    Posts
    6,965

    Default

    meh, this is the only short bus I ride:

    http://www.shortbusskims.com/skimboards/
    Drew
    New ride: 2012 Mojo
    Old ride: 2008 OBV

  7. #7
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    11,208

    Default

    That's a cool name for a board. Very memorable.
    My Mom said I'm not allowed to get wet!
    2008 LSV
    2000 Outback LS (sold)
    Exile Tunes
    PWI
    LLTR!!!!!!!!



  8. #8
    Join Date
    Mar 2012
    Location
    South Carolina
    Posts
    772

    Default Trailer master cylinder does not maintain fluid level

    Leak you say? Hmm, I see no leaks but I will just have to look harder I guess.

    Leak in the lines?
    Leak in the nipple? (Well maybe for a breast feeding mother)
    Leak in Seal?
    Leak where else am I forgetting?
    2008 Supra 21V
    2,600 lbs., Gravity III
    Z5 Cargo Rack
    Stereo: Pair of Wetsounds Pro 80's, Rockford Fosgate P500-2, Kicker ZX200.4, Exile ZLD, stock Kicker in-cabins, stock Kenwood HU
    Tow rig: 2008 Slate Tundra, Bilstein 5100's (F&R), 295/65/18 wrapped in Duratracs

  9. #9
    Join Date
    Jun 2007
    Location
    Vancouver, WA
    Posts
    3,971

    Default

    1- under the tongue - where the line goes into the actuator/master cylinder. If it's dripping from there you many never see it if it's when you're going down the road.

    2- all T-splits where the lines go off to other wheels

    3- each of the calipers where the line goes into it

    4- bleeder vales - are they tight?

    5- caliper itself leaking may be tricky to detect...

    Break fluid is usually really good at removing paint so look for any thin spots or rust. There are some vids on youtube about how to manually bleed your breaks by using a screwdriver to pump up the actuator's master cylinder.

    That may also work to look for any leaks when under pressure. Search for "Asian Bass Guy Break Bleeding". He does a decent job of showing and explaining the parts and steps although they can be lengthy.

    Basically pump it up into a pressurized state (brakes on) and go around looking for wet spots.
    Old enough to know better, young enough to do it anyway.

    2001 MobiusV

  10. #10
    Join Date
    Mar 2012
    Location
    South Carolina
    Posts
    772

    Default Trailer master cylinder does not maintain fluid level

    Ok so here is where I am at after looking some more at the the lines and all. I can see no visible sign of a leak on the t splits, each caliper, bleeder valves are tight, seals are good. Haven't checked the caliper itself by removing the wheels but I gave a good look all around and didn't see any fluid.

    I did notice though that after removing the reservoir cap that the fluid had gone down a little it since filling it last night, so it leads me to believe that there's a leak on the master cylinder but I know under the tongue where the line goes into the actuator it is not leaking as far as I can tell. There is "wetness" underneath there but I am not sure if it's from fluid that I spilled while filling as I did spill a little bit. I wiped everything down to dry it off as much I could so I will check it tomorrow again. I did notice that underneath the tongue right in the open spot where the solenoid is there's a little paint that is peeling away, again not sure if this is spilled fluid or leaking.

    I have a hunch "maybe" the master cylnder is leaking but not positive. I'll keep an eye on it and report back tomorrow if I notice the fluid level down again. (the trailer hasn't moved)

    Thanks berg for the pointers.
    2008 Supra 21V
    2,600 lbs., Gravity III
    Z5 Cargo Rack
    Stereo: Pair of Wetsounds Pro 80's, Rockford Fosgate P500-2, Kicker ZX200.4, Exile ZLD, stock Kicker in-cabins, stock Kenwood HU
    Tow rig: 2008 Slate Tundra, Bilstein 5100's (F&R), 295/65/18 wrapped in Duratracs

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