Where do I add brake fluid - 2003 GMC Yukon XL

You need to add BRAKE fluid. After that, blead your brakes. You need to find out where the brake fluid went. If there are no leaks, you need to check the remaining life on all four brake sets. If you have no leaks, chances are pretty good that you need new brakes.

YOU ADD BRAKE FLUID IN THE CLUTCH MASTER CYLINDER THATS YOU BRAKE MASTERCYLINDER.

LOOK UNDER THE HOOD LOOK FOR POWER BRAKE BOOSTER.ON FIREWALL ON DRIVER SIDE.YOU WILL SEE BRAKE MASTER CYLINDER BOLTED TO THE POWER BRAKE BOOSTER UNIT. POWER BRAKE BOOSTER LOOK LIKE A LARGE METAL BOWL.YOU WILL SEE BRAKE MASTER CYLINDER WITH A PLASTIC RESERVOIR WITH A COVER SAY BRAKE FLUID THATS WHERE YOU ADD YOUR BRAKE FLUID.

Brake fluid is always added to the brake master cylinder. The brake master cylinder is always located directly in front of the brake pedal in the engine compartment.
You should never have to add brake fluid. The brake hydraulic system is a sealed circuit and the fluid does not evaporate, nor does the brake fluid need replenishing due to "normal use". If you are having to add brake fluid to your master cylinder, there is a serious problem with your brakes that needs to be fixed.

Check the brake fluid level in the master cylinder. If it is low, you need to find out why it is low. It could be that your brake pads are getting really thin and need to be replaced, or it could be a fluid leak somewhere else in the system.

NOTE: You should NEVER add brake fluid without investigating WHY the fluid level was low. You should never have to add brake fluid to your car.

check your front brake pads and see if they need replaced then check your brake fluid after you change them. If you add brake fluid first you will leak brake fluid out when you compress the calipers to change the front brake pads. In the end make sure your brake master cylinder is full of dot 3 brake fluid before you drive.

You can add brake fluid when its cold just make sure you are adding the right fluid most vehicals take DOT 3 brake fluid, look inside your owners manual in the recommended fluids and lubricants section and make sure thats the right brake fluid for your ford......

Why would you add fluid?
As the front pads wear,the fluid will go down, not an issue
If you keep opening the fluid resevoir,you will let moisture in.

There is nothing special to adding brake fluid. With the hood open on the drivers side on the firewall you should see the master cylinder. The cover is either a small round cap that will just spin off or a rectangular one that will pull off. Use DOT 3 fluid and fill. Make sure no dirt falls in.

Use a Dot 3 conventional fluid and add to a clear plastic reservoir you will find under hood directlty in front of the steering wheel.There is a float inside which will detect low fluid and trip the indicator.Big concern is why is the brake fluid low in the first place?This will almost always mean wearing brake pad linings as the fluid will displace the missing lining thats worn off the pads.This probably is an indication that near future brake repairs are on the way which will include brake pad replacement. The other sitation you may enounter is once the pads are replaced,you will then be in an overfilled situation to where the fluid will have to be removed to have the correct amount. I would probably get a visual inspection on the brake lining wear then elect to add fluid at that time or replace brake pads.