Skoda Felicia

Since 1994 of release

Repair and car operation

System design, the description of separate knots and mechanisms

The scheme of brake system of models with an arrangement of valves-regulators of pressure on assemblage ГТЦ


1 — ГТЦ 2 — Valves-regulators 3 — the Servo-driver of the vacuum amplifier 4 — the Pedal of a foot brake 5 — the Gauge-switch of stoplights 6 — the Tank of a brake liquid	7 Vacuum tube to the inlet pipeline 8 — the Control lamp of level of a brake liquid 9 — the ignition Lock 10 — Stoplights 11 — Brake mechanisms of back wheels 12 — Brake mechanisms of forward wheels

The scheme of brake system of models with an arrangement of the valve-regulator of pressure at the back bridge (the electric part of system is similar resulted on an illustration above)


1 — ГТЦ 2 — the Servo-driver of the vacuum amplifier 3 — Brake mechanisms of forward wheels	4 — Brake mechanisms of back wheels 5 Valve-regulator

Design ГТЦ


1 — the Cylinder 2 — the Sealing cuff 3 — the Piston of the first brake contour 4 — the Pin 5 — the Sealing plug through passage 6 — the Inlet aperture 7 — the Sealing cuff 8 — the Spring	9 — the Sealing cuff 10 — the Piston of the second brake contour 11 — the Pin 12 — the Sealing plug through passage 13 — the Inlet aperture 14 — the Sealing cuff 15 — the Spring

Components of the valve-regulator of pressure


1 — the Case (trailer carving М6х1.5) 2 — the Spring 3 — the Rubber valve 4 — the Sealing lining (16х20 mm) 5 — the Sealing ring (8х4 mm)	6 — the Spring 7 — the Piston 8 — the Sealing ring (11х7 mm) 9 — the Transitive nozzle

Design of the servo-driver of the vacuum amplifier of brakes


1 — the Cover 2 — the Piston 3 — the Diaphragm 4 — the Forward (vacuum) chamber 5 — the Case 6 — the Sealing lining 7 — a pusher Rod 8 — the Adjusting tip 9 — the Union	10 — the Spring 11 — the Back (atmospheric) chamber 12 — the Valve 13 — the Valve 14 — the Rubber protective cover 15 — the Operating pusher 16 — the Filter 17 — the Channel

Adjusting exchanges of the servo-driver of the vacuum amplifier of brakes


1 — Piston GTTS 2 — the Adjusting tip of a pusher 3 — the Counternut	4 — Fastening to a pedal of a foot brake 5 — the Gauge-switch of stoplights 6 — the Pedal of a foot brake

The cylinder of a support of the brake mechanism


1 — the cylinder Case 2 — the Piston 3 — the Sealing cuff	4 — Pylnik 5 — Brake Pads

Deformations of a sealing cuff of the piston at operation of the brake mechanism


And — Before braking b — During braking With — After braking 1 — the Brake disk	2 — the Frictional overlay 3 — the Basis Pads 4 — the Piston 5 — the Cuff

Components of assemblage of the drum-type brake mechanism


1 — the Pin of a nave of the back bridge 2 — Assemblage of the brake mechanism 3 — the Spring washer 4 — the Bolt (60 Nanometers) 5 — the Brake drum 6 — the External wheel bearing	7 — Stupichnaja a nut 8 — Shplint 9 — the Cover of a nave of a wheel 10 — Lock корончатая a washer 11 — the Washer 12 — the Cable of a drive of a lay brake

Components of assemblage of the drum-type brake mechanism (continuation)


1 — the Coupling spring 2 — Razzhimnaja a lath 3 — Raspornyj a wedge 4 — the Wheel cylinder 5 — the Bolt with internal шестигранником (6 Nanometers) 6 — the Brake board 7 — Directing (анкерный) a pin 8 — Zaglushka	9 — the Brake boot 10 — the Spring распорного a wedge 11 — the Bottom coupling spring 12 — the Top coupling spring 13 — the Executive lever of a lay brake 14 — the Directing spring 15 — the Plate of a directing spring

Cut of the wheel cylinder


1 — the cylinder Case 2 — the Cuff 3 — the Piston 4 — the Pusher	5 — Pylnik 6 — the prorolling Gate 7 — the Rubber protective cap 8 — the Spring

The present Section is devoted mainly to the description of a design of brake systems not equipped ABS models. The information on device ABS is resulted in Section System of antiblocking of brakes (ABS) - the general information.

The function chart of brake system is presented on accompanying illustrations.

The system is put in action by a pedal of a foot brake. Through the servo-driver of the vacuum amplifier the effort put to a pedal is transferred in 2-kotnurnyj ГТЦ. Increase of pressure being in ГТЦ is transferred to a liquid on hydraulic lines to cylinders of brake mechanisms of forward and back wheels of the car. One or two valves-regulators of pressure are included in a hydraulic contour of back brake mechanisms.

The vacuum amplifier is connected to the inlet pipeline and intended for increase in a foot brake put to a pedal and effort rendered on piston GTTS.

Valves-regulators serve for restriction of pressure of a hydraulic liquid in a contour of brake mechanisms of back wheels for the purpose of prevention of premature blocking of the last at sharp braking. The remark: On equipped ABS models necessity for application of such terminators disappears.

Pistons of supports of brake mechanisms of forward wheels influence on brake Pads, densely nestling thus frictional overlays to working surfaces of disks. At release pedals Pads come back in a starting position, releasing a disk and braking stops.

In drum-type back brake mechanisms instead of supports the wheel cylinders which pistons unclench brake boots are used, pressing their frictional overlays to internal working walls of drums. At release pedals the special mechanism limits return movement of boots, automatically supporting a backlash at the set level.

Thanks to the described features of a design neither forward, nor back brake mechanisms do not require additional adjustments.

The lay brake is put in action by the lever located between forward seats of the car. The lever by means of тросового a drive is connected to boots of brake mechanisms of back wheels which carry out car braking.

The main brake cylinder (ГТЦ) with the valves-regulators of pressure built in in it

ГТЦ it is intended for creation of pressure of a working liquid in hydraulic contours of brake system of the car. The cylinder fastens by means of two nuts М10 on hairpins of the servo-driver of the vacuum amplifier.

ГТЦ from the case executed from pig-iron moulding in which the aperture of the cylinder in diameter of 22 mm in which pistons (3) and (10) drives of two contours of brake system are placed is pierced. In horizontal plane ГТЦ four apertures with a female thread are executed. Two left apertures with carving М6х1.5 are intended for вворачивания pressure valves-regulators in a contour of brake mechanisms of back wheels. The right apertures (М10х1.0) serve for connection of hydraulic lines of contours of forward brake mechanisms. In the top part of case GTTS (5) rubber sealing through passage plugs (5) and (12) nests under landing of tanks of a brake liquid are provided.

Back section ГТЦ is connected to brake mechanisms right forward and left back wheels (the first hydraulic contour). A lobby - to mechanisms left forward and right back wheels (the second contour).

In the piston (3) drives of the first brake contour are provided deepening under landing of a tip of a rod of a pusher of the vacuum amplifier of brakes.

Sealing cuffs (7) and (14) serve for hermetic sealing of working spaces of corresponding sections ГТЦ. The cuff (9) prevents penetration of a hydraulic liquid from one section in another, and a cuff (2) - hit in air cylinder.

Springs (8) and (15), established under pistons, provide reverse motion of the last. The spring (8), besides, Serves for increase in the effort put to the piston of the second section during braking.

Pins (4) and (11) limit return of pistons.

At squeezing of a pedal of a foot brake movement of a pusher of the servo-driver of the vacuum amplifier of brakes is transferred to the piston (3) ГТЦ and moves it in the cylinder. At displacement the piston compresses a spring (8) which, together with the increased pressure of a hydraulic liquid, displaces the piston (10). The cuffs planted on pistons (7) and (14) are thus displaced for limits of inlet apertures of tanks of a brake liquid. As a result, pressure increases in both hydraulic contours of system.

Pressure lifting in ГТЦ causes stronger pressing of sponges of sealing cuffs to walls of cylinders, in addition raising tightness of assemblage.

At release pedals pistons come back in a starting position under the influence of the efforts developed by springs. The inlet apertures informed with cavities of cylinders, open and the hydraulic liquid being in tanks freely gets to cylinders, automatically compensating increase the path volume, connected with deterioration of frictional overlays and-or leaks in lines.

In case of the damage of system causing depressurization of the first hydraulic contour, the piston (3) will move freely as pressure increase in a working cavity of the given section will stop. The piston (10) under the influence of the effort developed by a pusher of the vacuum amplifier and a spring (8), at the increased course of a pedal of a foot brake will provide serviceable functioning of the second hydraulic contour. In case of infringement of tightness of the second contour the piston (10) under the influence of the effort developed by a pusher and a spring (8), overcoming resistance of a spring (15), will move against the stop the core to a face wall of the cylinder. In the first brake contour there will be a normal increase pressure at the increased course of a brake pedal.

The valve-regulator () limits increase of pressure contours of brake mechanisms of back wheels, preventing premature blocking of the last. The valve case will screw in final aperture ГТЦ. Tightness of a joint is provided with a sealing lining (4). The transitive nozzle providing possibility of connection to assemblage of a brake line is screwed In a final aperture of the case of the valve-regulator. A brake liquid, arriving in an inlet aperture of a regulator, passes in a cavity between the rubber valve (3) and the Internal wall of the case. Further the liquid gets in the channel provided in the piston (7) and further, - to a brake line of a hydraulic contour of the brake mechanism of a corresponding back wheel. The spring (6) is picked up for effort of compression so that at pressure of a liquid to 20 kgs/sm²remained on removal from the valve. At the further increase of pressure the spring is definitively compressed also the piston nestles on the valve which blocks through internally an aperture in it. As soon as pressure in front of the piston will exceed on sufficient size pressure behind the piston, last moves again, opening access of a liquid to a contour. Further the cycle repeats necessary quantity of times in the course of car braking.

Thanks to such functioning of valves-regulators pressure in supports brake mechanisms of forward wheels always remains not more low, than in wheel cylinders of mechanisms back that excludes possibility юза the last.

The valve-regulator of pressure located near to the back bridge

On models of release since December, 1995 one valve-regulator of pressure in contours of brake mechanisms of back wheels of the car is established. The