Citroen Xantia

Since 1993 of release

Repair and car operation

Brake system

Specifications

The general parametres

System type

Two independent hydraulic contours (forward and back). ABS on some models. Disk forward and back brake mechanisms. Pressure in brake contours is provided with the main hydraulic system (the Uniform hydraulic system see the Head). The lay brake has тросовый a drive on forward wheels.

Brake mechanisms of forward wheels

Type	Disk, ventilated, with a 1-piston floating support
Diameter of a brake disk, mm
All models, except petrol with the engine of series RFY (16 valves)	266.0
The petrol models equipped with the engine of series RFY (16 valves)	283.0
Thickness of a brake disk, mm
All models, except petrol with the engine of series RFY (16 valves)
• the New disk	20.4
• the Minimum admissible value	18.5
The petrol models equipped with the engine of series RFY (16 valves)
• the New disk	22.0
• the Minimum admissible value	20.0
The maximum admissible difference in a thickness of disks, mm	0.1
The maximum admissible lateral palpation, mm	0.05
Working surface of a frictional overlay, sm²
All models, except petrol with the engine of series RFY (16 valves)	41
The petrol models equipped with the engine of series RFY (16 valves)	48
Thickness of new frictional overlays, mm
All models, except petrol with the engine of series RFY (16 valves)	12.0
The petrol models equipped with the engine of series RFY (16 valves)	11.0
The minimum admissible thickness of frictional overlays, mm
All models, except petrol with the engine of series RFY (16 valves)	3.0
The petrol models equipped with the engine of series RFY (16 valves)	2.0
Material of frictional overlays of Bezasbestovye АВЕХ	949

Brake mechanisms of back wheels

Type	Disk (with continuous disks), with 2-porshneym the fixed support
Diameter of a brake disk, mm	224.0
Thickness of a brake disk, mm
• the New disk	9.0
• the Minimum admissible value	7.0
The maximum admissible difference in a thickness of disks, mm	0.1
The maximum admissible lateral palpation, mm	0.05
Working surface of a frictional overlay, sm²	17
Thickness of new frictional overlays, mm	11.4
The minimum admissible thickness of frictional overlays, mm	2.0
Material of frictional overlays	Безасбестовые АВЕХ

Efforts of a tightening of carving connections, Nanometer

Fastening bolts анкерной скобы a support of the forward brake mechanism	105
Directing bolt of a support of the forward brake mechanism	50
Bolts of fastening of a back support	47
Bolts of fastening of a brake pedal to a partition	15
Bolts of fastening of the valve of management	20
Counternuts of a regulator of a lay brake	20
Bolt and nut of fastening of a rod of management of transfers	17
Shtutsernye connections of brake tubes	8
Fastening nuts гидроклапанного block ABS	22
Bolts/hairpins of fastening of wheel gauges ABS	8
Bolts of fastening of wheels	90

The general information

All models are equipped by 2-planimetric brake system with a drive from the main hydraulic system of the car (the Uniform hydraulic system see the Head) by means of the valve of the management playing a role of the main brake cylinder in brake systems of usual type. Pressure upon forward brake mechanisms moves directly from the main hydraulic system (through a pressure regulator). The contour of brake mechanisms of back wheels is connected to a hydraulic path of a back suspension bracket. At such scheme of distribution of pressure the basic brake effort is necessary on forward wheels of the car while the effort developed by back brake mechanisms depends on degree of loading of the car.

The pedal of a foot brake is mechanically connected with assemblage of the valve of management.

Forward brake mechanisms are equipped by 1-piston supports of floating type influencing disks of ventilated type.

In back brake mechanisms the fixed supports equipped with two pistons, providing a clip колодок to continuous disks are used.

The lay brake has mechanical тросовый a drive and influences forward wheels of the car. The control lever is located by a lay brake on a floor between forward seats.

The system of antiblocking of brakes (ABS) is included into a standard complete set of some models and can be established in addition on any models. The design and a principle of functioning of system are described in section System of antiblocking of brakes (ABS) - the general information.

Safety measures

As a working body in hydraulic system of cars Citroyon Xantia mineral liquid LHM of darkly green colour is used. Application of hydraulic liquids of any other type is fraught with failure of rubber sealants and connecting hoses of components of system. Store a hydraulic liquid in tightly closed container.

In extreme situations use as a working body in hydraulic system of engine oil SAE 10 or SAE 20 is supposed, however in such cases on arrival to a repair/parking place the hydraulic path should be emptied and at the first possibility is filled by standard liquid LHM.

After removal from system of a liquid of a doubtful origin the hydraulic path should be washed out special structure which can be got in the firm services-centres of company Citroyon. Having pumped over system, leave its filled промывочным structure which should be used throughout approximately 1000 km (600 miles) run. Then it is necessary to empty and fill system with standard hydraulic liquid LHM again. In case of failure of rubber consolidations as a result of use of the non-standard liquid, all damaged components are subject to replacement. It is necessary to charge performance of the given work to experts of a car repair shop.

As replaceable components it is necessary to use only firm details of manufacture of company Citroyon which are usually painted in white or green colour and are intended for use in contact to liquid LHM.

One of key rules which should be observed at service of components of a hydraulic path, the most careful observance of cleanliness is. Carefully wipe components subject to a detachment and surfaces adjoining to them. All opened after removal of a component of connection at once cork in order to avoid hit in system of a dirt and extraneous subjects.

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