How to Remove and Replace Left Rear Brake Line

Brake lines run from the distribution block under the master cylinder to a proportioning valve or metering valve, proportioning valve combination. Some vehicles have a distribution block at or just before the rear axle. If removal is required, read on to learn how to remove and replace the left rear brake line.

Instructions

1

The brake lines can be accessed by raising the vehicle on a car lift or by using a hydraulic jack and jack stands. Most cars sit too low for the mechanic to get to them. Pump the brake pedal several times to remove any pressure remaining in the brake lines. Once the pressure has been relieved, use the car lift or jack stands to raise the vehicle and use a creeper to work under the vehicle.

2

Locate the rear distribution block and determine the size of the open end box end wrench needed to disconnect the left rear brake line from the distribution block. If your car does not have a rear distribution block, it will run through a combination valve attached to the master cylinder in the engine compartment. Use the same procedure you use for the rear distribution block and place the drip pan under the master cylinder.

3

Place a drip pan under the rear distribution block and under the left rear brake line connection. Use your open end box end wrench to turn the fitting counter clockwise until it is loose from the front or the rear distribution block.

4

Turn the fitting until it is loose enough to turn by hand. Use your hand to remove the fitting from the distribution block and allow the fluid to drain into the drip pans. Use your line wrench to disconnect the left rear brake line from the brake hose at the left rear wheel hub. Again allow any fluid left in the line to drain out.

5

Once the brake line is loose from its fittings, you will need to locate any mounting clamps holding the brake line to the frame rail. Use a flat tip screw driver to loosen the mounting clamps so the brake line will be free to remove. Note any wear marks on the brake line. These are caused by the brake line rubbing against the mounting clamps or the frame rail. When installing the new brake line, make sure the contact points causing the wear marks are separated using bundle ties or plastic line covers. Remove the brake line and set aside.

6

A new brake line can be purchased at you local dealer or parts house. You can also use a small tubing bender to bend the brake line to the same shape as the old line. You will need to install new ferrules on each end of the new line. Install the new brake line in the same position as the old one. Stand off the brake line to prevent rubbing and tighten all mounting clamps.

7

Use your open end box end wrench to connect the fittings on each end of the new brake line. Use your line wrench to connect the new brake line to the left year brake hose. Take care not to twist the brake hose while tightening fitting.

8

Once you have secured the new brake line in place, you will need to remove the air now trapped in the brake lines. There are several methods of removing the air from the system. Consult your service manual for the year model of your vehicle to determine the recommended procedure. Once air is removed, top off the brake fluid in the master cylinder. Use your hydraulic jack to lower the vehicle and remove the jack stands. If your car is on a lift, slowly lower the lift until the vehicle is level to the floor.