Warning: Individual characteristics are also given in the text of the Chapter and, if mandatory, are highlighted in bold
Common parameters | |||
Design | Disc brakes on front and rear wheels. The front brake discs are blown. Electronic-hydraulic anti-lock system. Hydraulic system - double-circuit, diagonal. Brake pads - non-asbestos | ||
disc brake | Front | Front | Rear |
Manufacturer | FS– III | FN– 3 | – |
Brake shoe thickness, mm | |||
new | 14 | 14 | 11.5 |
wear limit (with back plate) | 7 | 7 | 7 |
wear limit (without back plate) | 2 | 2 | – |
Brake disc thickness, mm | |||
diameter | 256/280 | 288 | 232 |
new thickness | 22 | 25 | 9 |
wear limit | 19 | 22 | 7 |
Brake fluid | 1.5 L DOT 4 specification FMVSS 116 | ||
Electronic Control Diagnostic Trouble Codes braking and stability stabilization systems are given in the Specifications to Chapter 5. | |||
Tightening torques for threaded connections | |||
Fastener tightening torques are also given in the text of the Chapter and on
some illustrations*. *Tightening torques in bold type are subject to exact compliance; Efforts not in bold are indicative only | |||
Front wheel brake caliper guide bolts | 28 Nm | ||
Brake caliper holder to hub | |||
Front wheels | 28 Nm | ||
rear wheels | 65 Nm | ||
Rear wheel brake caliper to holder | 30 Nm | ||
Mudguard, front | 10 Nm | ||
Parking brake lever on body floor | 25 Nm | ||
Brake hose on caliper | 35 Nm | ||
Wheel bolts | 120 Nm |
Elements of electronic-hydraulic system for stabilization of dynamic stability ABS/EBV/EDS
- 1 - ASR switch
- 2 - brake light switch
- 3 - rear left speed sensor
- 4 - rear right speed sensor
- 5 - speed sensor front right
- 6 - speed sensor front left
- 7 - ABS/EBV/EDS/ASR control unit. Integrated in the hydraulic control box
- 8 - control lamp ABS / EDS
- 9 - control lamp ASR
- 10 - a control lamp of level of a brake liquid
- 11 - brake master cylinder, brake booster, brake pedal
- 12 - hydraulic block
Elements of the ABS/EDS control system
- 1 - brake master cylinder and brake booster
- 2 - hydraulic control unit
- 3 - diagnostic connector. In the center console under the ashtray.
- 4 - cover
- 5 - a control lamp of a reserve of a brake liquid
- 6 - control lamp ABS / EDS
- 7 - speed sensor / sensor wheel. Rear axle
- 8 - stoplight switch. Above the brake pedal
- 9 - speed sensor / sensor wheel. front axle
The brake system consists of a brake booster, a brake master cylinder with an ABS hydraulic unit connected, and disc brakes for the front and rear wheels. The brake system has two circuits acting diagonally. One circuit acts on the front right / rear left, the other on the front left / rear right brakes. If one of the circuits fails, the vehicle is braked by one front and one rear brake. Fluid pressure in both circuits is created in the dual master cylinder by acting on the brake pedal.
The brake fluid reservoir is located in the engine compartment above the master brake cylinder and supplies fluid to the entire brake system.
Disc brakes are installed on the front wheels, which have ventilation for better heat dissipation. The rear wheels are braked by solid disc brakes.
The engine brake booster stores part of the vacuum created in the engine intake pipe. When acting on the brake pedal, the force on the pedals through the brake booster increases due to the action of the vacuum.
Disc brakes are equipped with so-called rigid calipers. These calipers only need one piston to push the brake pads.
The parking brake acts through cables on the rear wheel brakes.
Warning: Working on the brake system requires extreme cleanliness and strict adherence to instructions. In the absence of the necessary experience, it is advisable to contact the service station.
Brake pads are designed for use in a specific car model. It is recommended to use brake pads approved by the manufacturer or the Federal Motor Vehicle Control Office. These brake pads have the appropriate KBA marking.
Warning: When driving on wet roads, periodically depress the brake pedal to dry the disc brakes. During the rotation of the wheel, moisture is discharged from the brake discs under the action of centrifugal force, but a film of silicone remains, a product of rubber abrasion, grease and other contaminants that reduce the effectiveness of the brakes.
Warning: Dirt burns on the surface of the brake pads and rain grooves lead to the formation of grooves on the surface of the brake discs, resulting in reduced braking performance.
Warning: When cleaning the brake system, dust is released that can be harmful to human health, therefore brake dust must not be inhaled.
ABS/EBV/EDS/ASR
ABS: Anti-lock braking system, prevents the wheels from locking during heavy braking. This contributes to maintaining controllability during braking and improves driving reliability.
EBV: Electronic Brakeforce Distribution distributes brake force to the rear wheels using ABS hydraulics. Since the EBV control is much more sensitive than the mechanical brake force regulator, a much larger control range is used.
When driving in a straight line, the braking force is transferred to the rear wheels completely. In order to also ensure stability when braking when cornering, it is necessary to reduce the braking force on the rear wheels. Through the ABS speed sensors, the system detects whether the vehicle is moving straight or turning. When cornering, the braking force of the rear wheels is reduced. This allows the rear wheels to receive maximum lateral guiding force.
EDS: Electronic Locking Differential, brakes spinning wheels when the vehicle is moving off. Due to this, the torque is transmitted to the drive wheels.
The electronic differential lock is active when starting off and is automatically disengaged at a speed of 80 km/h. The special advantages of this system: it does not adversely affect the dynamic qualities of the car and driving comfort.
Recommendations for ABS/EBV/EDS systems
A special switch in the electronic control unit ensures that the system, in the event of a malfunction, (e.g. cable break) or a decrease in the voltage of the on-board network below 10 V was turned off. The situation is displayed on the instrument panel by the ignition of control lamps. At the same time, the conventional braking system retains its operability. During braking, the car behaves as if there is no ABS system.
Warning: If the ABS and brake warning lights come on while driving, the rear wheels may lock up under heavy braking because the brake force distribution is not working.
Warning: If one or more warning lamps on the instrument panel come on while driving, the following must be observed:
Order of execution
1. Stop the vehicle briefly, turn off the engine and start it again.
2. Check battery voltage. If the voltage is less than 10.5V, charge the battery.
Warning: If the warning lamps come on at the beginning of the movement and then go out after a while, this indicates that the battery voltage was initially too low, and then increased again during the movement as a result of charging by the alternator.
3. Check if the battery terminals are securely fastened and have good contact.
4. Put the car on stands, remove the wheels and check the electrical wires going to the wheel speed sensors for external damage (grinding). A more detailed check of ABS/EBV/EDS should be carried out in a workshop.
Warning: Before performing electric welding work, the connector of the control unit must be disconnected. The connection is undocked only when the ignition is switched off. When performing paint and varnish work, it is allowed to heat the control unit for a short time to a temperature of not more than + 95°C, and for a long time (Max. 2 hours) up to +85°C.
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