Attention! The laying of the metal pipes of the brake system should be entrusted to a specialized workshop, because this operation requires a certain amount of experience.
Brake hoses designed for a certain pressure serve as flexible connections between rigidly fixed and moving parts of the car.
If any damage visible to the naked eye appears on the hoses, the hoses must be replaced.
The rubber on the hoses can swell over time, causing the hose to clog and brake fluid not returning to the expansion tank from the wheel cylinder. The brake mechanism of the respective wheel is overheating. If in this case the fitting is opened, the wheel is not blocked.
Attention! Protect brake hoses from contact with oil and kerosene, do not varnish them or coat them with an anti-corrosion protection agent for the underbody.
Attention! If air has got into the ABS hydraulic modulator, it is recommended to entrust the removal of air to a specialized workshop. This can happen in the event of a depressurization of the ABS hydraulics or in the case when brake fluid has completely leaked out of at least one chamber of the expansion tank and, as a result, air has been pumped into the system.
Removing
1. Mark the direction of rotation of the wheels.
2. Loosen the wheel nuts. The vehicle must be on wheels during this operation.
3. Place the vehicle on jack stands and remove the wheels.
4. Unscrew union nuts 2 and disconnect pipeline 1 and hose 4. In this case, clamp 3 remains on the holder (see illustration).
5. Plug the openings of the pipeline and hose with suitable plugs.
6. Unscrew the bolt 6 and disconnect the brake hose 4 from the caliper, without allowing the hose to twist (see illustration). Collect the leaked brake fluid.
7. Remove clamp 5 and release the brake hose from the holder on the suspension strut (see illustration 12.6).
Installation
8. Install hoses approved by the vehicle manufacturer. Lay the new brake hose in the same way as the old one was laid, avoiding twisting.
9. Screw the brake hose bolt into the threaded connection of the caliper, replacing the old seals with new ones, and tighten the bolt with a force of 40 Nm.
10. Fix the brake hose in the holder and connect it to the pipeline by tightening the union nut with a force of 16 Nm.
11. Fix a brake hose in the holder on an amortization rack.
12. Turn the steering wheel of the jacked vehicle left and right from lock to lock and make sure the hose follows all wheel movements and will not rub against nearby parts.
Attention! Bleed the brake system with an air bleeder.
13. Install the wheels in accordance with the marks made during removal and tighten the wheel bolts in a cross pattern with a torque of 110 Nm.
14. Turn the steering wheel of the vehicle on wheels left and right from lock to lock and make sure that the hose follows all the movements of the wheel and does not come into contact with nearby parts.
Attention! Make sure that:
- A) brake hoses are securely connected,
- b) the brake hose is fixed in the holder,
- V) brake bleeders are screwed on,
- G) there is enough brake fluid in the expansion tank.
15. Carry out a leak test of the brake system with the engine running.
To do this, depress the brake pedal with a force of 200-300 N (20-30 kg) for approximately 10 seconds. The pressure in the system and, accordingly, on the brake pedal, must not fall. Check all connections for tightness.
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