54bobby Posted April 30, 2017 Share Posted April 30, 2017 guys, the front reservoir of my 87, 2.5 is loosing brake fluid. down 3/4 yesterday, my son took it out today and maybe did 100 or so miles and when he got back it was down the same again. the front sump controls the rear brakes correct? refilled it, and had my son pump repeatedly as well as press and hold both with truck running and not running. i crawled under with a flashlight and could see absolutely no leeks, drips, or tell tail wet spots on or around any brake lines, as well as the inside of the tires. no leek evidence anywhere except the MC. could it be leaking into the vacuum assist booster? help. Link to comment Share on other sites More sharing options...
Pete M Posted May 1, 2017 Share Posted May 1, 2017 the rear lines like to leak between the gas tank and frame. really hard to catch those. :( Link to comment Share on other sites More sharing options...
Eagle Posted May 1, 2017 Share Posted May 1, 2017 ^^^ This. Also, jack it up, remove the rear wheels, pull the brake drums and look inside for leaking wheel cylinders. Link to comment Share on other sites More sharing options...
Knucklehead97 Posted May 1, 2017 Share Posted May 1, 2017 ^^^ This. Also, jack it up, remove the rear wheels, pull the brake drums and look inside for leaking wheel cylinders. peel back the rubber on the cylinders as well. I thought only one of mine were leaking and then I looked behind the rubber on the other one and it was full of fluid. Link to comment Share on other sites More sharing options...
54bobby Posted May 1, 2017 Author Share Posted May 1, 2017 willl check out all above responses after work. thanks guys. is it possible for the MC to leak into the vacuum booster and go undetected except for fluid lose in MC? Link to comment Share on other sites More sharing options...
DirtyComanche Posted May 1, 2017 Share Posted May 1, 2017 is it possible for the MC to leak into the vacuum booster and go undetected except for fluid lose in MC? Yes. But it's rare. Normally you'll see it running down the front of the booster, or onto the firewall, or puddling all over the inner fender. You can just pull the two nuts that hold the master on and slip it back to see, no need to undo the lines just to take a look. I believe they're a 13mm. 5 minute job. Link to comment Share on other sites More sharing options...
Eagle Posted May 1, 2017 Share Posted May 1, 2017 If the brake fluid were being sucked back into the booster, I would expect the level to drop in the rear-most chamber (the one closest to the booster) rather than the forward chamber. My money is on a rusted/ruptured line over the fuel tank. I've had two of them go in that location. Link to comment Share on other sites More sharing options...
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