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Brake Hose Replacement
 
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Pelican Technical Article:

Brake Hose Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$100

Talent:

****

Tools:

Vise grips, 11mm line wrench, 14mm wrench

Applicable Models:

BMW Z3 (1996-02)

Parts Required:

Brake hose, brake fluid

Hot Tip:

Flush brake fluid from system

Performance Gain:

More dependable brakes

Complementary Modification:

Replace in pairs or sets

BMW Z3 service brakes consist of hydraulic brake calipers, one at each wheel. When you step on your brake pedal you are compressing a piston in your brake master cylinder. This cylinder is full of brake fluid. The brake fluid that is now under pressure passes through metal lines to the individual calipers. Since the calipers float with the suspension a flexible hose is need to connected the body mounted brake lines to the floating caliper. These brake hoses crack and leak over time. They can also become restricted with material from the brake system and allow the caliper to stick. This causes uneven and premature brake wear. Inspect your brake hoses during each major service. 

Check the mounting points and hose ends for dry rot or cracking. Replace your brake hoses at the first sign of wear. In this tech article we will show you how to replace these flexible hoses. The front left of the vehicle will be shown; all other wheels are similar.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches. 

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability. 

Vehicle models change and evolve, as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Raise and support the axle of the vehicle that you are replacing the hoses on. See our tech article on jacking up your vehicle. You'll want both wheels off the ground for this repair.

Suction out the fluid in the brake fluid reservoir. This will minimize spilled fluid. 

Working at the front strut, pull brake hose out of the mounting tab (green arrow).
Figure 1

Working at the front strut, pull brake hose out of the mounting tab (green arrow).

Where I live, the hose connections can become seized from rust.
Figure 2

Where I live, the hose connections can become seized from rust. I like to spray penetrating oil and allow it to soak in before attempting to separate the lines (green arrow).

Loosen the steel line by counter-holding the brake hose, then loosening the line nut using an 11mm line wrench.
Figure 3

Loosen the steel line by counter-holding the brake hose, then loosening the line nut using an 11mm line wrench. Since we are replacing the brake hose, using Vise Grips here is OK.

Sometimes the nut does not want to come loose.
Figure 4

Sometimes the nut does not want to come loose. I found a great pair of Vise Grips that work in this situation. The Vise Grips shown in this photo do a good job of holding the steel line securely while loosening without rounding it out.

Next, loosen the connection at the brake caliper using a 14mm wrench.
Figure 5

Next, loosen the connection at the brake caliper using a 14mm wrench. Just break the hose loose, you will not remove it yet.

Unscrew the steel line connection from brake hose.
Figure 6

Unscrew the steel line connection from brake hose. Then remove the brake hose from the mounting bracket. Once the body side of the brake hose has been removed, unscrew the brake hose from the caliper.

Working the brake caliper, screw the new hose into the caliper until finger tight.
Figure 7

Working the brake caliper, screw the new hose into the caliper until finger tight. Check the installation position, then tighten the hose. Next, install hose into mounting bracket at body and thread steel line nut into hose. Be sure the hose is in the bracket correctly and nut threads in smooth. Tighten steel line nut, then install hose into mounting bracket at strut. Bleed brakes and check brake operation. See our tech article on brake bleeding.

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Page last updated: Fri 12/2/2016 02:07:48 AM