Checking the condition of hoses and pipelines (BMW X5 E53)

Attention! Before removing the hoses, release the pressure in them. Disconnect the air conditioner hoses only at the service station.

Constantly elevated temperatures in the engine compartment lead to intensive wear (aging) of rubber and plastic hoses. Hoses should be regularly checked for cracks, loose clamps, hardening of the material and signs of leaks.

Vacuum hoses

Vacuum hoses are used in exhaust gas toxicity reduction systems and are color-coded. Different systems use hoses of different cross-sections, wall thicknesses, heat resistance, and resistance to collapsing. When replacing hoses, strictly ensure that they match the material of the one being removed.

When removing more than one hose, mark the fittings and hoses to ensure proper assembly of the system when installing them. Check the vacuum hoses by listening with a stethoscope (without membrane) the surfaces of the hoses and the places where they are connected to the systems, for the presence of a characteristic hissing sound of air being sucked in.

Fuel hoses

Warning! Start checking the fuel system by releasing the pressure in it. Checking hoses and pipelines associated with fuel leaks requires increased fire safety measures. Fuel that gets on the skin is immediately washed off with plenty of water and soap.

Fuel hoses should be checked in the following order.

• Check the fuel hoses for signs of wear and tear, paying particular attention to the bend area and in front of the fuel element fittings.
• Check the condition of the clamps on the fittings of the fuel system elements and hoses.
• When replacing elements of the fuel system, tape clamps (if there are any) replace with screw type clamps.

Metal pipelines

Metal pipelines, in the form of separate sections, are installed between the fuel pump and the fuel injection system.

The pipelines must be checked in the following order.

• Carefully inspect the pipes for dents, twisting and cracks.
• When replacing, use only seamless steel tubes, copper and aluminum tubes are not strong enough to withstand vibrations caused by engine operation.
• Check the brake system pipes at their connection points with the master cylinder and the ABS hydraulic unit for cracks or loose fittings.
• Any signs of brake fluid leakage require immediate and thorough inspection of the entire brake system.

Power steering system hoses

The power steering hoses should be checked primarily for signs of fluid leakage, loose fittings and worn clamps. If hoses are leaking or clamps are worn, they should be replaced immediately.