Inspect the RV to determine if it is high enough off the ground for you to work on comfortably, or if you need to lift it up and provide work space. Insert the lift under the axle of the tires you will be working on and lift the RV to the desired height.
Remove the tires from the area you will be working on. Use a screwdriver to pry the hubcaps loose and remove them. Attach the appropriate-sized socket to the lug nuts of the tires and attach the impact gun. Run the air compressor until you have enough pressure to run the impact gun and remove the lug nuts. Slide the tires off the bolts and set them aside for later.
Place the drain bucket or pan underneath the rubber brake hose you will be working on. Find the bleeder screw on the wheel cylinder or caliper, depending on your model of RV, and ensure you can easily loosen it with a wrench. Spray with penetrating lubricant if necessary. Tighten them snugly once you ensure they can be loosened. Spray lubricant on the rubber hose connectors and any corresponding bolt or screw clips that hold the hose in place.
Remove the retaining clips or brackets holding the hoses in place with either a ratchet or socket and the needle-nose pliers. Disconnect the rubber hose from the caliper or disc with a ratchet or socket and remove the retaining bolt or the hose to the steel brakes, if working on drum brakes. Loosen any steel brake-line connections with a flare wrench. Remove the washers from the retaining bolt and caliper housing with the flat-head screwdriver by prying them out. Disassemble and remove the old hoses.
Reverse the process to install the new rubber hose. Replace the copper washers and ensure they are firmly in place. Tighten the retaining bolts and replace the clips and brackets. Replace the tires and tighten the lug nuts. Put the hubcaps back in place. Bleed the brake system by opening the bleeder valves and pumping the brakes of the RV until all of the air is out of the hoses and only fluid comes out into your drip pan. Check the level of brake fluid in the master cylinder and fill it as needed.
