2. Each time during maintenance, check all elements of the brake system for cracks, signs of damage to the containment, signs of fluid leaks, swelling and other damage. The hoses are the critical and most vulnerable part of the brake system, so they must be inspected with the utmost care. If any doubtful signs are found, the suspected hose must be replaced.
Attention: Do not allow brake hoses to come into contact with oil and gasoline, do not expose them to painting, as well as to special compounds for anti-corrosion protection of the bottom.
3. Over time, during the operation of the car, old brake hoses can swell, while their flow area decreases - this makes it difficult for the brake fluid to return to the GTZ and the complete removal of the brake pads from the disc. As a result, the brake mechanisms are heated, which can lead to failure of both the mechanisms themselves and the wheel bearings.
4. Replacement steel and flexible brake lines can always be purchased at branded service stations, as well as in branded auto accessories stores.
Attention: In no case should you use any tubes as replacements, except for branded ones, specially designed for installation in the brake circuit of your car.
5. If it is necessary to replace the metal brake lines, you must contact the Opel service station, because. their laying requires a certain skill and qualification - careless handling can lead to bending of the tubes and affect the flow area of the channel. Brake lines must be at least 20 mm away from moving or vibrating body, suspension or steering components. During installation, all standard clamps and line holders must be used.
6. Before replacing the hose, check the brake fluid level in the reservoir and top up if necessary. Remove the corresponding wheel. Have plugs ready to plug the brake lines after disconnecting them, and a rag to clean up spilled brake fluid.
Note: The procedure for replacing the front wheel brake hose is described below. The rear wheel hose is replaced in the same way, but after the hose is released from the rear suspension holder, the holder must be removed.
7. To loosen the flexible hose fittings with the steel tubing of the hydraulic lines, use a special box wrench with a split head. After releasing the nut, remove the retainer and release the brake hose from the support bracket in the wheel arch (see resist. illustration) - the locking bracket must be reinstalled after disconnecting the hose. Immediately close the brake pipe with the prepared plug.
8. Release the hose from the holder on the shock absorber strut (see resist. illustration), for which, using pliers, remove the locking plate.
9. To disconnect the brake hose from the caliper, unscrew the hollow bolt (see illustration 4.8) fitting and discard its old sealing washers - during assembly, the washers must be replaced without fail.
10. Make sure that the new brake hoses exactly match the dimensions and specifications removed from the car.
11. Fix a brake hose with new sealing rings on a support. tighten the hollow bolt to the required torque. Then remove the plug and connect the hose to the brake pipe, tighten the union nut. After that, fix the hose in the holder - make sure that the hose is not twisted during installation.
Note: On models equipped with the interactive dynamic driving system (IDS+) (see chapter «Controls and methods of operation»), when installing, it is necessary to put a special protector on the brake hose (see resist. illustration).
12. With the front wheels hanging out, turn the steering wheel to the right and left - the hose should not interfere with the moving parts of the steering mechanism and come into contact with other structural elements.
13. After replacing the hose, be sure to bleed the air from the brake system using a special device (see Section 3). Check the fluid level in the GTZ reservoir, correct if necessary.
14. Attach the ABS sensor holder to the brake hose and install the removed wheels in their places. Before starting the operation of the vehicle, make sure that the brakes are working properly.
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