Replacing the front brake hose (BMW 3 Series E46)

Do not allow brake hoses to come into contact with oil or gasoline, do not coat with paint or underbody protection.

Removal

1. Mark the position of the front wheels relative to the hub with paint. This will allow you to install the balanced wheel in its original position during assembly. Loosen the wheel mounting bolts with the car on the ground. Raise the front of the car,

2. Press the brake pedal and hold it in this position. To do this, you can insert a wooden block between the seat and the pedal. To do this, move the seat back and then forward again. This eliminates the possibility of brake fluid leaking out of the reservoir after disconnecting the hoses and air getting into the system.



3. Disconnect the brake pipe "1" by unscrewing the union nut "2" from the brake hose. In doing so, hold the brake hose "4" by the planes or by the hexagon "3" to prevent the connecting element from turning in the elbow.

Some brake fluid may leak out. Collect the fluid in a bottle intended only for this purpose.

4. Disconnect the brake hose from the caliper.

Installation

5. Secure the brake hose to the caliper.



6. Set the front wheels straight.

7. Secure the brake hose in the holder and connect the brake line with a union nut. Hold the brake hose by the planes or hexagon to prevent the connecting element from rotating in the elbow. Tightening torque 18 N·m.

8. Install the front wheels so that the markings applied during removal match. Pre-lubricate the wheel disk seating belt on the hub with a thin layer of bearing grease. Do not lubricate the wheel mounting bolts. Replace rusty bolts. Secure the wheels with bolts.

9. After installation, check with the wheel unloaded (the car is lifted), whether the hose follows all the movements of the wheel when it turns and whether it touches adjacent structural elements.

10. Lower the vehicle onto its wheels and tighten the mounting bolts crosswise to a torque of 100 Nm.

11. Turn the steering wheel to the right and left until it stops and check with the vehicle standing on its wheels whether the hose follows all the movements of the wheel without touching adjacent structural elements.

12. Remove air from the brake system.

• Are the brake hoses secured?
• Is the brake hose secured in the holder?
• Are the air bleed nipples tightened?
• Is there enough brake fluid?
• With the engine running, check for leaks. To do this, press the brake pedal with a force of 200-300 N (20-30 kg) for 10 s. The pedal should not weaken. Check all connections for leaks.

Brake fluid should never be poured out or thrown away with household waste. Local authorities inform drivers about possible disposal sites.