Replacing the front brake hose (BMW 5 Series E39)

Caution: Brake hoses must not come into contact with oil or fuel. Do not coat brake hoses with paint or underbody anti-corrosion coating.

Removal

Mark the position of the front wheels relative to the hubs with paint. This will allow the balanced wheel to be installed in its original position. When unscrewing the wheel bolts, the car must stand on its wheels. Raise the car from the front and remove the front wheels.

The brake pedal is easy to press and hold. To do this, place a board between the carcass and the seat as a spacer, moving the seat back and then forward accordingly. This prevents the brake fluid from leaking out of the expansion tank and air from entering the system after disconnecting the brake lines.



Unscrew the union nut "2" of the brake pipe "1" at the connecting head of the brake hose. In this case, hold the brake hose "4" by the flats or the hexagon "3" so that the connecting head does not turn in the retaining angle.

Caution: Some brake fluid may leak out. Collect the brake fluid in a bottle that is designed only for brake fluid.

Unscrew the brake hose from the brake caliper.

Installation

Screw the brake hose to the brake caliper.

Set the car wheels to a lower position for straight-line movement

Insert the brake hose into the holder and screw the brake line with the union nut. Hold the brake hose by the flats or hexagon so that the connecting head does not turn in the holding corner. Tighten the threaded connection of the M12 pipeline with a torque of 15 Nm, and M10 with a torque of 20 Nm.

Place the wheels so that the marks applied by removing the uterus coincide. Do not lubricate the wheel bolts. Screw on the front wheels.

After installation with unloaded wheels (the car is lifted) check that the hoses track all wheel movements without touching anything.

Lower the vehicle and tighten the wheel bolts crosswise to 100 Nm.

Turn the steering wheel of the vehicle standing on its wheels all the way to the right and right, checking whether the brake hoses track all the movements of the wheels, without touching the surrounding parts.

Remove air from the brake system.

Attention. Perform welding for compliance with safety requirements:

• Are the brake hoses tightened securely?
• Is the brake hose in the holder?
• Are the air bleed valves tightened?
• Is there enough fluid in the brake system?
• With the engine running, perform a leak test. To do this, apply a force of 200 to 300 N to the brake pedal for approximately 10 seconds (from 20 to 30 kg). Do not release the brake pedal. Check all connections for leaks.

Note: Handle brake fluid as special waste.

(This article is based on data from the website: www.bmwman.ru)