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Replace a Spare part Brake Vacuum Hose – a defective one or if the limit of use has been already reached. Find out useful information about Brake Vacuum Hose

There are two types of pipes: inlet and outlet. Intake manifolds are used to supply combustible mixture to the engine cylinders. They are casted of aluminium alloy. Intake manifolds are heated with a cold solution or exhaust gases. This contributes to the evaporation of the fuel film. Exhaust manifold is designed to output the exhaust gas to the intake pipe and muffler. It is casted of cast iron. Heat emission of the exhaust gases is used to heat the outlet fuel-air mixture. For this purpose inlet and outlet pipes are connected by iron asbestos pins.

The degree of heating of the intake pipe is adjusted automatically by a special device - a thermostat and choke installed in the exhaust pipe. It changes the direction of flow of exhaust gases. Intensity of heating of the inlet pipe should be large when warming a cold engine and when driving the car in winter. Heating of combustible mixture in the inlet pipe is controlled by a thermostat, which consists of a bimetallic spiral spring, choke, swinging on an axis, and a lever with a counterweight mounted on the axis of the choke.

The spring is made of a strip, consisting of two layers of different metals with different thermal expansion. Therefore, the spiral is unwound when heating and twisted when cooling. Until the engine is cold, the spring is twisted. Under the action of a lever with a counterweight the choke is installed in a position corresponding to the largest heating when the exhaust gases pass along the walls of the intake pipe and heat it. When the engine warms up, the spring untwists, the lever with a counterweight rises and the choke takes a position that corresponds to the lowest heating. In this case, the choke will block the way of the gases to the inlet pipe wall and send them to the muffler.

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Brake Vacuum Hose for VW POLO (6R, 6C), NISSAN X-TRAIL (T30), BMW 3 TOURING (E46)

Conduit Malfunctions
  • cracks on the working surface;
  • fluid leakage;
  • blockage of the line;
  • wear of seals;
  • displacement of the conduit from the slot in the cylinder block.
Symptoms of conduit malfunctions
  • frequent motor overheating;
  • increased engine vibration;
  • overcooling of the power unit;
  • external or internal coolant leak;
  • increase in fuel consumption;
  • appearance of a specific anti-freeze smell;
  • impossibility to reach maximum engine power.
Causes of the conduit faults
  • violation of the engine operation rules (use of low-quality coolant, untimely fluid replacement);
  • exceeding the lifetime of the cooling system elements;
  • installation of low-quality components;
  • substandard work on the system maintenance and repair.
Conduit Diagnostics

Through examination you can identify a number of the conduit malfunctions. For example, you may find a crack, a damage, or a reduction in the flow passage of the conduit and its hoses. We recommend to immediately turn to professionals who will hold a comprehensive diagnosis of the cooling system on a special stand. Experts advise to carry out preventive diagnosis each time you replace the coolant. Note that in a new car this consumable should be replaced after 200 thousand kilometers, and then every 30 thousand kilometers. More detailed information is provided in the maintenance schedule of your car.

Replacement of the conduit

In most cases, the conduit requires only replacement. To remove it and then install a new part, you should:

  • set the car on a service pit or a ramp;
  • remove the battery for the work convenience;
  • drain coolant from the cooling system;
  • remove the fuel rail;
  • dismantle the starter cover from the exhaust manifold studs;
  • loosen the bottom nut to the front adapter stud of the right engine mount bracket and take the adapter towards;
  • move aside the rear adapter;
  • unscrew the nut on the front lifting bolt and remove it;
  • unscrew the rear manifold fastening nut;
  • remove washers from studs;
  • dismantle the conduit from the studs;
  • install all parts in the reverse order;
  • pour in coolant.
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