Brake Hose/Line: Description and Operation

PURPOSE
The purpose of the chassis brake tubes is to transfer the pressurized brake fluid developed by the master cylinder to the wheel brakes of the vehicle. The chassis tubes are steel with a corrosion resistant coating applied to the external surfaces.

The purpose of flex hoses is to transfer the pressurized brake fluid developed by the master cylinder to the wheel brakes of the vehicle. The flex hoses are made of reinforced rubber. Rubber flex hoses allow for the movement of the vehicles suspension.

CAUTION:
- Use only double wall 4.75 mm (3/16 in.) steel tubing with Al-rich/ZW-AC alloy coating and the correct tube nuts are to be used for replacement of a hydraulic brake tube.
- Care should be taken when replacing brake tubing, to be sure the proper bending and flaring tools and procedures are used, to avoid kinking. Do not route the tubes against sharp edges, moving components or into hot areas. All tubes should be properly attached with recommended retaining clips. If the primary or secondary brake tube from the master cylinder to the ABS Hydraulic Control Unit (HCU) or the brake tubes from the HCU to the proportioning valve require replacement, only the original factory, or equivalent brake line containing the flexible section can be used as the replacement part. This is required due to cradle movement while the vehicle is in motion.