1979-81 Pontiac Firebird TA Four-Wheel Disc 3/16" Rear Axle Brake Lines OE Steel 2pc Made in the USA Axle lines These lines typically run from the axle hose out to each rear wheel that may be disc or drum. Axle lines are usually 2 piece and feed the rear brakes. They may go straight into the rear wheel cylinder or caliper or may have a rubber brake hose that connect the rear caliper to the metal hard line so when it is time to change the pads the caliper can be removed with out having to disconnect and re-bleed the brakes. In many cases axle lines have spring on them to protect the line from road debris. It is added protection to the line. .
