Metal lines and rubber brake hoses should be checked frequently for leaks and external damage. Metal lines are particularly prone to crushing and kinking under the vehicle. Any such deformation can restrict the proper flow of fluid and therefore impair braking at the wheels. Rubber hoses should be checked for cracking or scraping; such damage can create a weak spot in the hose and it could fail under pressure.
Any time the lines are removed or disconnected, extreme cleanliness must be observed. Clean all joints and connections before disassembly (use a stiff bristle brush and clean brake fluid); be sure to plug the lines and ports as soon as they are opened. New lines and hoses should be flushed clean with brake fluid before installation to remove any contamination.
REMOVAL & INSTALLATION
See Figures 1, 2, 3 and 4
- Disconnect the negative battery cable.
- Raise and safely support the vehicle on jackstands.
- Remove any wheel and tire assemblies necessary for access to the particular line you are removing.
- Thoroughly clean the surrounding area at the joints to be disconnected.
- Place a suitable catch pan under the joint to be disconnected.
- Using two wrenches (one to hold the joint and one to turn the fitting), disconnect the hose or line to be replaced.
- Disconnect the other end of the line or hose, moving the drain pan if necessary. Always use a back-up wrench to avoid damaging the fitting.
- Disconnect any retaining clips or brackets holding the line and remove the line from the vehicle.
If the brake system is to remain open for more time than it takes to swap lines, tape or plug each remaining clip and port to keep contaminants out and fluid in.