Since 1994 of release
Repair and car operation
+ Cars of mark Skoda Felicia
+ The maintenance instruction
+ Routine maintenance
+ Engine repair
+ Systems of cooling, heating
+ The power supply system
+ Engine electric equipment
+ Power shafts
- Brake system
The general information
System design, the description of separate knots and mechanisms
Prorolling of hydraulic system
Replacement of hoses and tubes of a hydraulic path of brake system
Replacement колодок disk brake mechanisms of forward wheels
Replacement of boots of drum-type brake mechanisms of back wheels
Condition check, removal and installation of disks of forward brake mechanisms
Removal, check of a condition and installation of drums of brake mechanisms of back wheels
Removal, major repairs and installation of supports of brake mechanisms of forward wheels
Removal, major repairs and installation of wheel cylinders of back brake mechanisms
Removal, major repairs and installation of the main brake cylinder (ГТЦ)
Removal and installation of a pedal of a foot brake
Check of serviceability of functioning, removal and installation of the vacuum amplifier of brakes
Removal, check of a condition and installation of the control valve of the vacuum amplifier of brakes from a hose
Adjustment of a lay brake
Removal and installation of the lever of a lay brake
Removal and installation of cables of a drive of a lay brake
Check of serviceability of functioning, removal and installation of the valve-regulator of pressure in hydraulic contours of brake mechanisms of back wheels
Removal, installation and adjustment of the gauge-switch of stoplights
System of antiblocking of brakes (ABS) - the general information
Removal and installation of components of systems ABS
Removal and installation of the vacuum pump (diesel models)
Check of a condition and major repairs of the vacuum pump (diesel models)
+ Suspension bracket and steering
+ Body and salon furnish
+ Onboard electric equipment
System of antiblocking of brakes (ABS) - the general informationComponents of brake system with ABS
Function chart of brake system with ABS
Arrangement of the gauge of frequency of rotation of a forward wheel
Arrangement of the gauge of frequency of rotation of a back wheel
ABS enters into a standard complete set of some models, on the others can be established in addition. Into system structure enter the hydraulic modulator with the electronic block of management established on it (ECU) and four wheel gauges. The modulator is equipped by hydraulic electromagnetic valves (on two on each of brake mechanisms [one inlet and one final]) and электроприводной the pump. A system problem is prevention of premature blocking of wheels of the car at sharp braking. The given purpose is reached at the expense of instant modulations of pressure in hydraulic contours of brake mechanisms of wheels.
Operation of electromagnetic valves of the modulator operates ECU, continuously receiving the information on speed of rotation of each of wheels of the car from four wheel gauges. Analyzing arriving signals, ECU defines current speed of movement of the car and uses it as a reference point at definition of the moment of the beginning of blocking of each of wheels. In normal conditions the brake system functions as usual, not equipped ABS.
At the moment of the beginning of blocking of any of wheels ECU gives out a command on operation of the corresponding final electromagnetic valve (ов) the hydraulic modulator. As a result given brake mechanism () is isolated from ГТЦ and pressure in it ceases to raise.
If speed of rotation of the given wheel (wheels) continues to decrease, the management block gives out a command on opening inlet electromagnetic the valve (ов) and activates электроприводной the pump which pumps out a brake liquid back in ГТЦ, returning rotation freedom to the blocked wheel (ам). As soon as speed of rotation of a wheel (wheels) rises to comprehensible value, the pump is disconnected, and the electromagnetic valve () reestablishes communication of a hydraulic contour of the corresponding brake mechanism (ов) with ГТЦ. The cycle can repeat set of times in a second, allowing to keep the control over driving at sharp braking without dependence from a condition of a road covering.
Functioning of electromagnetic valves and the returnable pump causes pulsations in a hydraulic contour, therefore pushes of a pedal of a foot brake during functioning ABS are quite natural phenomenon and should not cause anxiety.
Functioning ABS completely is based on electric signals developed by wheel gauges. In order to avoid false operations of the modulator, ECU it is equipped by the special control contour tracing all signals arriving on the block. In case of receipt of a doubtful signal, or at revealing of signs of decrease in target pressure of the storage battery, on an instrument guard the corresponding control lamp informing the driver about refusal ABS lights up. The brake system thus continues to function in a usual mode, providing adequate braking of the car.
During car operation watch tightness of connections of a hydraulic path and an electroconducting condition. Components ABS do not require additional service.
In case of infringement of functioning ABS the car should be driven away on a company car repair shop where will be made full diagnostics of system with application of the special input reader and corresponding repair.