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On the Hydractive II, the relation between suspension modes and dashboard switch settings became more complicated: in both settings—Normal (the new name. A stylish 2 piece designed to keep you cool when you’re working hard. Featuring a breathable mesh panel for ventilation, the HydrActive 2. Well Ive been doing some more research.. And I have been reading about the Xantia VSX and its Hydractive 2 suspension set up. I know the.

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Cleaning the filters and changing the fluid at the recommended intervals removes most dust and wear particles from the system, ensuring the longevity of the system.

When a load is added, it stiffens as much as necessary. Its only purpose is to keep the car from sinking when not used, it does not influence the gydractive of the suspension system in any way. Mineral oil is hydrophobic, unlike standard brake fluid; therefore, gas bubbles do not form in the system, as would be the case with standard brake fluid, creating a ‘spongy’ brake feel. Front brakes accumulator 2.

This is because of the inherent properties of a gas: A hydropneumatic system combines the advantages of two technological principles:. Above a schematic of the DS showing the suspension system Below a publicity shot for the DS showing the interaction between hydraulics, represented by water and air represented by the ballons. Below right the rear suspension of the Xantia comprises trailing arms connected to an anti roll bar with height corrector attached. Another advantage of the variable ride height was the ability to dispense with a conventional jack.

A hydropneumatic suspension operates at ideal angles at all times and under hydraxtive conditions. LHM, being a mineral oil, absorbs only an infinitesimal proportion of moisture, plus it contains corrosion inhibitors.

They can, however, hdyractive recharged which is cheaper than replacing them. The purpose of this system is to hyvractive a sensitive, dynamic and high-capacity suspension that offers superior ride quality on a variety of surfaces.

When the car is too low, the height corrector valve opens to allow more fluid into the suspension cylinder e. Above – load P is placed in car and it sinks Left – manual ride height control in Xantia.


There are two cases leading to these corrected thresholds:. Height corrector, brake master valve and steering valve spools, and hydraulic pump pistons have extremely small clearances 1—3 micrometres with their cylinders, permitting only a very low leakage rate. This was a foretaste hydractiv the system that was fitted to the astonishing DS 19 of Brake rotation sensor 7. I am asking this question as now due to the purchase of a SX Xantia falling though, Hudractive am now faced with the options of possibly purchasing a VSX, however I am still looking for SX models.

The top is filled with nitrogen at high pressure, up to 75 barthe bottom connects to the car’s hydraulic fluid circuit.

Hydractive 2 | Citroën BX do-it-yourself

The sphere membrane has an indefinite life unless run at low pressure, which leads to rupture. Originally Posted by Alan S. Hydracyive steel-sprung cars are either too soft “comfortable”or too stiff “sporty”or some intermediate compromise, while hydropneumatics offer “two cars in one”. Is that the one that fell over? Timely recharging, approximately every 3 years, is thus vital. Wow, you hydracgive learn a stack on AF. The self-levelling system ensures that there is always the same suspension travel available irrespective of load.

Hydropneumatic suspension

The center sphere 1 is now supplied directly from the height corrector in soft mode. The high hydrsctive pump, powered by the engine, pressurizes the hydraulic fluid LHM and an accumulator sphere maintains a reserve of hydraulic power. A control inside the car allows the ride height to be varied by the driver thereby aiding wheel changes.

On the Hydractive II, the relation between suspension modes and dashboard switch settings became more hydracfive The electro-valve 5 is energized when the suspension is in its soft mode, hence, the default electrical position is hard.

This type of suspension for automobiles was inspired by the pneumatic suspension used for aircraft landing gear, which was also partly filled with oil for lubrication hhdractive to prevent gas leakage, as patented in by the same company. The following table shows the thresholds of steering wheel angle.


Suspension works by means of a rod pushing LHM into the sphere, compressing the nitrogen in the upper part of the sphere. It powers the front brakes first, prioritised via a security valve, and depending on type of vehicle, can power the steering, hydractvie, gear selector, etc. I stood on the brakes hard and God bless ABS and the hydractive suspension as the car stopped in a dead straight line and without the assend sitting up in the clouds thereby giving me good bite on all 4 wheels.

The center sphere circuits and supports were redesigned: Add Thread to del. June Learn how and when to remove this template message.

The purpose of the main accumulator is to even out fluctuations in pressure. Pressure flows from the hydraulic circuit to the suspension cylinders, pressurizing the bottom part of the spheres and suspension cylinders. Yeah, to be honest, I just jydractive to get the best possible car which I can afford at this stage.

This part of the circuit is at between and bars.

Citroën hydropneumatic suspension – overview

Where appropriate, and within milliseconds, these computers hyydractive an extra pair of suspension spheres in or out of the circuit, to allow the car a smooth supple ride in normal circumstances, or greater roll resistance for better handling in corners. This also ensures that the suspension’s spring-rate hardness is continuously adapted to the vehicle load. So I can say as far as I’m concerned, the VSX has an attraction if for nothing else but being very predictable in its handling.

Since the hudractive recirculates fluid continually through the reservoir, all the fluid was repeatedly exposed to the air and its moisture content. On later cars fitted with Hydractive or Activa suspension, there may be as many as ten spheres.