Why is my 97 expidition losing brake fluid. I cant locate where it's coming from but as soon as I put it in it runs out

-You mean how to bleed brake fluid...?
If so. Here is a basic to do. (Doesn't matter front or rear)
-Most car's bleeder screws fit 10mm combination wrench.
Here thing that you need:
-Wrench
-A jar (Glass or plastic. Doesn't matter)
-A Clear vinyl tubing 1/4" inside diameter by 12" to 18"
-a helper.
-A bottle of new brake fluid. (Buy the big one)
Now locate the bleeder screw, lose it then tight it back just little to prevent leaking. (Only lose DO NOT TAKE IT OUT)
-Hook up the tube to it, 1 end into the jar.
-Ask helper to press brake pedal all the way to the floor then HOLD right there and lose the bleeder screws to let the fluid come out then tight it BEFORE RELEASE THE PEDAL.
Repeat this step until you see clear fluid come out. You're done this one. Then go to the next one.
MAKE SURE CHECK THE RESERVOIR VERY OFTEN. DO NOT LET IT RUN OUT OF FLUID!!! If it has ABS YOU'LL HAVE BIG TROUBLE.
Here the fast way to do. Empty the fluid reservoir and fill new one before bleed the system.

Good Luck


Mai

Calipers do not retain brake fluid, you apply the brake ...the pressure is transmitted to the cylinders in the calipers and they act on the pads

Sounds like you need a braking system diagnostic of you are losing brake fluid and experiencing lock up. Sounds like it should be looked into immediately .....just in case

lose the fittings at the master cylinder, you should have two of them , one for the front brakes and one for the rear, get a friend to push the brake pedal ( not too hard, be careful they may spay all over) ; and see if any fluid is coming out with his pedal down tight the fittings back with the pedal down,so you don't get any air in the lines. If nothing comes out you have a bad master cylinder.

Your brake switch had probably went bad.....Its up under the dash at the top of your brake pedal......

if master cylinder is bad. the pedal will go to floor running or not.when the pedal goes down at a standing stop it is usually the master cylinder thats bad. and losing vacuum. thats if there are no other leaks at wheel cylinders etc. if putting on a new master cylinder, do not forget to bench bleed it! heres how. put the master cylinder in the vise, fill it full of fluid then pump the plunger with a dowel or something soft as to not ruin plunger part.do not let it run dry ! when fluid comes out from master cylinder and no more air is in it. fill it up and put on car. heres what I do! remove the lines from old cylinder on car. as long as you do not lose any fluid doing this, there is no need to bleed air from brakes when done. after on car make sure master cylinder is full of fluid. start the car and pump the brakes a few times, then you should be all set.

sound like you are disconecting the brake hose if you are, put a hose clamp on,

Be sure to check your engine coolant as well, the trans is cooled via the radiator, so you may be losing ATF there. Where does the fluid appear to be coming from? You can use a can of brake cleaner to wash down the trans underneath, and blow dry with compressed air. Maybe once its cleaned off, you will be able to determine where the leak is coming from.

is usually caused by the diode for the daytime running lights goin bad,its located under the drivers side of the dash to the right of the steering column,its a square aluminum heat sink(usually black) about 3" wide with just a small 2 wire plug goin to it,hope this helps

Look by your air filter duct...refer to this picture:

Check your brake fluid level in the engine compartment. Its located on the rear RH side of the engine compartment, its a white/clear resevoir connecting to a large black circular object. If the fluid is low, fill to proper level, also I would recommend having your brake system checked as there may be a leak. If the fluid is fine and at the proper level, you may have a damaged/broken brake fluid level sensor or damaged/broken Emergency brake switch. Hopefully this helps....please rate thanks!!