How to Replace Rusted Brake Lines

The brake lines on your vehicle perform a critical function--they provide the brake calipers with enough hydraulic fluid to enable the vehicle to slow down and stop. When there is an obstruction inside the brake lines, it is normally caused by rust. Brake lines can rust from the inside out as well as from the outside in. Brake fluid naturally draws moisture to it, and if this moisture builds up inside the lines, it will slowly rust the lines over time. When the rust gets bad enough, the lines will break and you'll need to replace them.

Instructions

    1

    Open the hood of your vehicle and locate all of the brake-line connections on the brake proportioning valve and master cylinder, as well as the connections on the brake calipers at the wheel hub assembly at each wheel.

    2

    Place a catch pan under one of the brake calipers and unbolt the brake line using a tube-nut wrench. Next, press on the brake pedal to drain the brake line.

    3

    Disconnect all brake line connections, using the tube-nut wrench.

    4

    Remove the lines from the routing guides. Note the orientation and routing pattern of the existing brake lines. Mark down the orientation and routing of the brake lines, using a pen and paper.

    5

    Install the new brake lines according to the routing path you noted in step 4.

    6

    Reconnect the brake-line tube nuts to the brake master cylinder, the brake proportioning valve and the brake calipers, using the tube-nut wrench.