10. Brake system


Specifications
ATTENTION

Separate characteristics are provided also in the text of the Head and in case of obligation of their performance are highlighted in bold type


General parameters
Design Disk brake mechanisms on forward and back wheels. Disks of forward brake mechanisms – blown. Electronic hydraulic anti-blocking system. Hydraulic system – double-circuit, diagonal. Brake slips – bezasbestovy
Disk brake Forward Forward Back
Manufacturer FS– III FN– 3 –
Thickness of a brake shoe, mm
new 14 14 11.5
wear limit (with a back plate) 7 7 7
wear limit (without back plate) 2 2 –
Thickness of a brake disk, mm
diameter 256/280 288 232
thickness of new 22 25 9
wear limit 19 22 7
Brake fluid 1.5 l of DOT 4 of the FMVSS 116 specification
Diagnostic codes of malfunctions of electronic control are given by systems of braking and stabilization of stability in Specifications to Chapter 5.
Efforts of tightening of threaded connections
The moments of an inhaling of fixture are given also in the text of the Head and on some illyustratsiyakh*.

* The moments of an inhaling highlighted in the text in bold type are subject to exact observance; the efforts which are not highlighted in bold type are given only approximately
The directing bolts of a brake support of forward wheels 28 N • m
The holder of a brake support to a nave
Forward wheels 28 N • m
Back wheels 65 N • m
Brake support of back wheels to the holder 30 N • m
Mudguard, ahead 10 N • m
The lever of the parking brake on a body floor 25 N • m
Brake hose on a support 35 N • m
Bolts of wheels 120 N • m

Elements of electronic hydraulic system of stabilization of dynamic stability ABS/EBV/EDS
1 – ASR switch
2 – switch of a stop signal
3 – speed sensor back left
4 – speed sensor back right
5 – speed sensor forward right
6 – speed sensor forward left
7 – ABS/EBV/EDS/ASR control unit
It is built in the hydraulic control unit		 8 – control lamp of ABS/EDS
9 – control lamp of ASR
10 – control lamp of level of brake fluid
11 – main brake cylinder, amplifier of a brake, brake pedal
12 – hydraulic block

ABS/EDS control system elements
1-main brake cylinder and amplifier of a brake
2 – hydraulic control unit
3 – diagnostic socket. In the central console under an ashtray.
4 – cover		 5 – control lamp of a reserve of brake fluid
6 – control lamp of ABS/EDS
7 – number sensor sensor turns/wheel. Back axis
8 – switch of a stop signal. Over a brake pedal
9 – number sensor sensor turns/wheel. Forward axis

The brake system consists of the amplifier of a brake, the main brake cylinder with the connected hydraulic ABS block and disk brakes of forward and back wheels. The brake system has two contours operating on diagonal. One contour influences on forward right/back left, another on forward left/back right brakes. At refusal of one of contours braking of the car is carried out to one lobbies and one back by brakes. Liquid pressure in both contours is created in the dual main cylinder by impact on a brake pedal.

The tank of brake fluid is located in a motive compartment over the main brake cylinder, it provides with liquid all brake system.

On forward wheels the disk brakes having aeration for the best heat sink are established. Back wheels are braked by continuous disk brakes.

The amplifier of a brake of the engine accumulates a part of the vacuum created in the soaked-up engine pipeline. At impact on a brake pedal the effort to pedals through the amplifier of a brake increases thanks to effect of vacuum.

Disk brakes are supplied with so-called rigid supports. At these supports only one piston is necessary for pressing brake shoes.

The parking brake affects through cables brakes of back wheels.
ATTENTION

Work with the brake system demands special purity and exact observance of instructions. In the absence of necessary experience it is expedient to address on HUNDRED.


Brake shoes are intended for use in concrete model of the car. It is recommended to apply the brake shoes resolved by the manufacturer or Federal department on control of vehicles. Such brake shoes have the corresponding marking of KBA.
ATTENTION

At movement along wet roads it is necessary to press periodically a brake pedal for drying of disk brakes. In the course of rotation of a wheel moisture under the influence of centrifugal force is dumped from brake disks, but there is a film of silicone, a rubber attrition product, lubricant and the other pollution reducing efficiency of operation of brakes.
Prigara dirt on surfaces of brake shoes and rain flutes leads to formation of furrows on a surface of brake disks, decrease in efficiency of braking is a consequence of what.
When cleaning the brake system dust which can do harm to health of the person therefore it is impossible to inhale brake dust is emitted.


ABS/EBV/EDS/ASR

ABS:

The anti-blocking system, interferes with blocking of wheels at sharp braking. It promotes preservation of controllability in the course of braking and increases reliability of the movement.

EBV:

The system of electronic distribution of brake effort, by means of ABS of hydraulics distributes brake effort on back wheels. As adjustment works with EBV significantly more sensitively, than the mechanical regulator of brake effort, is used considerably the bigger range of regulation.
At the movement on a straight line the effort of braking is transferred to back wheels completely. That when braking on turns also to provide stability, it is necessary to reduce effort of braking on back wheels. Via speed sensors the ABS system defines whether the car directly moves or it turns. At the movement on turns the effort of braking of back wheels decreases. Thanks to it back wheels can receive the maximum side directing effort.
EDS: The electronic blocking differential, brakes the turned wheels at start-off of the car from the place. Thanks to it the torque is transferred to driving wheels.
Electronic blocking of differential works at start-off from the place and is turned off automatically at achievement of the speed of 80 km/h. Special advantages of this system: it does not exert negative impact on dynamic qualities of the car and on comfort of management.
Recommendations about the ABS/EBV/EDS systems
The special switch in an electronic control unit watches that the system in the presence of damage (for example, break of a cable) or undervoltage of onboard network lower than 10 V was disconnected. The situation is displayed on the dashboard by fire of control lamps. The usual system of braking at the same time keeps the working capacity. In the course of braking the car behaves as if the ABS system is absent.
ATTENTION

If during the movement control lamps of ABS and system of braking light up, then at strong braking back wheels can be blocked as distribution of brake effort does not work.
If during the movement on the dashboard one or several control lamps light up, it must be kept in mind the following:

PERFORMANCE ORDER
1. Stop for a while the car, switch off the engine and again start it.
2. Check tension of the rechargeable battery. If tension less than 10.5 In, charge the battery.
ATTENTION

If control lamps light up in a start of motion and then after a while die away, it indicates that tension of the rechargeable battery at first was too low, and then during the movement as a result of charging the generator raised again.
3. Check whether plugs of the rechargeable battery are reliably fixed and whether they have reliable contact.
4. Put the car on supports, remove wheels and check the electric wires going to sensors of speed of wheels for existence of external damages (mastication). More detailed inspection of ABS/EBV/EDS has to be carried out in conditions HUNDRED.
ATTENTION

Before performance of electrowelding works it is necessary to rasstykovat the control unit socket. Connection undocks only at the switched-off ignition. When performing paint and varnish works it is allowed to heat quickly the control unit to temperature no more than + 95 °C, and it is long (max. 2 hours) up to the temperature of +85 °C.