Removal and installation the rear brake caliper (BMW 5 Series E39)

Note: If the brake caliper needs to be removed only to dismantle the brake disc, do not release the brake hose, otherwise the brake system will need to be bled after assembly. Hang the brake caliper on the body using a hook made from wire so that the brake hose is not twisted or stretched.

Removal

Mark the position of the rear 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 behind and remove the rear wheels.

The brake pad can be easily squeezed and secured. To do this, insert a board between the pad and the seat, moving the seat back and then forward accordingly. This prevents 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 coupling head "3" of the brake hose. In this case, hold the brake hose by the hexagon "4". Usually, the brake hose "5" does not unscrew from the brake caliper.

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

Disconnect the plug connector of the "arrow" wire of the brake pad wear indicator sensor on the right disc brake caliper. In doing so, pull the plug and tighten the wire.

Unscrew the brake shield mounting bolts "2" with a 17 mm ring spanner. Remove the brake shield and caliper with installed brake pads from the brake disc. 1 - protective caps of the caliper mounting bolts.

Installation

Place the brake shield with the caliper and installed brake pads.

Attach the brake shield with bolts and tighten them to a torque of 65 Nm.

Connect the brake pad wear sensor plug to the right side of the vehicle.

Place the brake hose on the coupling head and screw the brake line with the union nut. Make sure that the brake hose does not twist. Secure the brake hose in the holder.

Bleed the brake system.

Tighten the rear wheels. Do not lubricate the wheel bolts. Position the wheels so that the marks applied by removing the parade coincide. Lower the car, tighten the wheel bolts crosswise to 100 Nm.

Caution: Press the brake pedal hard several times until you feel strong resistance. This will cause the brake pads to contact the discs and take the correct position for the operating conditions.

Check the brake fluid level in the expansion tank and, if necessary, top up the level to the MAX mark.

Attention. Perform welding for compliance with safety requirements:

• Are the brake hoses tightly tightened?
• 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 about 10 seconds (from 20 to 30 kg). Do not release the brake pedal. Check all connections for leaks.

Note: Brake fluid must be disposed of as special waste.