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Pelican Technical Article:

Brake Lines Replacement

Kerry Jonsson

Time:

1 hour1 hr

Tab:

$100

Talent:

**

Tools:

11mm, 14mm line wrench

Applicable Models:

Mercedes-Benz W211 (2003-09)

Parts Required:

Brake lines

Hot Tip:

Use large metal pan to catch brake fluid

Performance Gain:

Fix sticking caliper

When you step on your brake pedal you are pushing on a piston in your master cylinder that compresses hydraulic brake fluid. This fluid flows through the brake lines to your caliper. The brake fluid then continues to push on the caliper pistons and forces the brake pads against the rotors. The brake master cylinder is mounted to the body of the car and metal lines bring the brake fluid to each corner of the car. Since the brake caliper is mounted on the suspension hub of the vehicle the brake hose needs to flex as the suspension reacts to the road. A rubber coated nylon or Teflon brake line is used as the flexible brake hose of your car. If you brake line is leaking you will lose brake fluid and therefore brake pressure. Over time contaminants build up in your hydraulic brake system and can cause the brake hoses to collapse. If the hoses are collapsed then you will not have sufficient flow to the caliper, this will result in poor braking performance and may lead to the car pulling in one direction under braking. In this tech article we will go over all the steps to replace your brake hoses.

In order to replace your brake hoses you will need to lift and support your vehicle. See our tech article on jacking up and supporting your vehicle.

Front Brake Hose ThisPicture illustrates the right side front caliper with the wheel already removed.
Figure 1

Front Brake Hose This picture illustrates the right side front caliper with the wheel already removed. Use an 11mm wrench to remove the metal brake line flare nut fitting from the brake hose. If the brake line spins with the brake line fitting you can use vise grip pliers to hold the brake hoses. The hoses are getting replaced anyway.

Front Brake Hose Thread the metal flare nut brake line fitting all the way out until the fitting slides loose on the metal brake line.
Figure 2

Front Brake Hose Thread the metal flare nut brake line fitting all the way out until the fitting slides loose on the metal brake line.

Front Brake Hose ThisPicture illustrates the right side wheel house just in front of the strut.
Figure 3

Front Brake Hose This picture illustrates the right side wheel house just in front of the strut. Use an 11mm wrench to loosen the flare nut fitting from the brake hose. If the brake line spins with the brake line fitting you can use vise grip pliers to hold the brake hoses. The hoses are getting replaced anyway.

Front Brake Hose Pull the rubber brake hose (green arrow) out of the bracket.
Figure 4

Front Brake Hose Pull the rubber brake hose (green arrow) out of the bracket.

Front Brake Hose Thread the other end of the metal brake line fitting (green arrows) from the rubber brake hose.
Figure 5

Front Brake Hose Thread the other end of the metal brake line fitting (green arrows) from the rubber brake hose.

Front Brake Hose Pull the brake hose out of its bracket on the body of the car.
Figure 6

Front Brake Hose Pull the brake hose out of its bracket on the body of the car.

Front Brake Hose The brake hose is held in place by a grommet (green arrow).
Figure 7

Front Brake Hose The brake hose is held in place by a grommet (green arrow). Remove the brake hose from the bracket on the strut to remove the hose. You can now rotate the hose until it is unthreaded from the caliper. Be prepared to catch any dripping fluid. Installation is the reverse of the removal steps. Fit one end of the brake hose into the bracket on the body and tighten the flare nut fitting. Install the other end of the brake hose in the caliper bracket. Attach the small metal brake line flare nut fitting on the brake caliper to the brake hose and tighten. You can now bleed the brakes. See our tech article on brake bleeding.

Rear Brake Hose ThisPicture illustrates the right rear wheel house.
Figure 8

Rear Brake Hose This picture illustrates the right rear wheel house. At the body side connection of the brake hose use an 11mm wrench (green arrow) to loosen the brake line flare nut fitting from the brake hose.

Rear Brake Hose Thread the flare nut fitting (green arrow) all the way out of the brake hose.
Figure 9

Rear Brake Hose Thread the flare nut fitting (green arrow) all the way out of the brake hose.

Rear Brake Hose Pull the rubber brake line out of the bracket on the body of the car.
Figure 10

Rear Brake Hose Pull the rubber brake line out of the bracket on the body of the car.

Rear Brake Hose Using a 14mm line wrench (green arrow) loosen the brake line connection on the caliper side.
Figure 11

Rear Brake Hose Using a 14mm line wrench (green arrow) loosen the brake line connection on the caliper side.

Rear Brake Hose You can now rotate the hose until it is unthreaded from the caliper.
Figure 12

Rear Brake Hose You can now rotate the hose until it is unthreaded from the caliper. Be prepared to catch any dripping fluid. Installation is the reverse of the removal steps. Thread the brake hose into the caliper and tighten. Attach the other end of the hose to the flare nut fitting on the metal brake line and tighten. You can now bleed the brakes. See our tech article on brake bleeding.

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