Brake system of the car Mazda 3 (BK)

General information about the brake system
The vehicles described in this manual are equipped with a hydraulic brake system. Front brakes are disc, rear brakes are disc or drum. All brakes are equipped with...

Safety brake pedal
The safety brake pedal design minimizes pedal backlash. This provides cushioning for the force of impact on the driver's lower body. In a frontal impact, the movement of...

Vacuum Brake Booster — Description
The vacuum brake booster reduces the force on the brake pedal, making it easier to drive. The vacuum amplifier uses a diaphragm, on both sides of which a vacuum is...

Brake Master Cylinder — Description
The master brake cylinder is used on dual-circuit brake systems. The front right and rear left brakes are actuated by the primary piston, while the front left and rear...

Pressure Regulator — Description
The pressure regulator limits the output pressure to the rear brakes after the pressure reaches the limit value in the master brake cylinder. The adjuster is used when...

Brake Fluid Level Sensor — Description
The brake fluid level sensor, located in the brake fluid reservoir, turns on the BRAKE warning light when it detects a low fluid level. As soon as the level returns to...

Anti-Lock Braking System (ABS)
Braking is most effective when the grip of the tire on the road surface is maximum. During braking, the tire slides over the surface, and the circumferential speed of...

Dynamic Stability Management
The hydraulic control mechanism of the DSC HU/CM system and the control strategy of the system are essentially adopted from the previous model 323, except for the...

DSC indicator lamp
The DSC warning lamp is installed in the instrument cluster and notifies the driver when DSC is activated (the car is in side slip) or TCS activation (drive wheel slip)...

DSC system switch, DSC system deactivation indicator lamp
The DSC system switch is located on the instrument panel and turns off DSC when the corresponding button is pressed. The DSC Disable indicator lamp is located in the...

Integrated stability control sensor
The yaw rate sensor and the lateral g-force sensor are combined. Integrated sensor mounted on the left side of the parking brake lever (left hand drive models) or on the...

DSC HU/CM stability control unit
A compact and lightweight DSC HU/CM integrated unit with increased reliability is used. The DSC HU/CM calculates the input signals from all sensors and controls the...

Emergency braking control
During emergency braking, the DSC HU/CM increases the brake fluid pressure by increasing the pressure in the master cylinder, so more braking force is achieved with less...

Controller Area Network (CAN)
Anti-Lock Braking System (ABS/TCS) and DSC HU/CM transmit/receive information via CAN. Sending information: about the path traveled; about wheel speed; from the front...

On-board diagnostics of the brake system
Operation of the on-board diagnostic system of the anti-lock braking system (ABS/TCS) or DSC is essentially carried over from the previous 323 (BJ), except for the...

Checking and adjusting elements of the brake system
Check the brakes on a dry and level road, at various vehicle speeds with light and hard pressure on the brake pedal, avoiding brake lock and tire slip. Three main...

Checking the level of brake fluid in the reservoir of the hydraulic drive of the working brake system
The brake fluid reservoir is located in the engine compartment. The reservoir has a transparent body, so the brake fluid level can be controlled from the outside. The...

Removal of air from the brake system
Note. Air from the hydraulic brake drive must be removed every time the brake system pipes have been disconnected. If the hydraulic line is disconnected from the master...

Vacuum hose check valve (brake booster)
Remove clamps and vacuum hose. Pic. 6.10. Check Valve Check Diagram Alternately apply vacuum and pressure to the vacuum hose on the engine side and make sure that air...

Removal and installation of a vacuum hose (brake booster)
Pic. 6.11. Disconnecting the vacuum hose connector Disconnect the vacuum hose connector from the brake booster by depressing the tabs on the vacuum hose connector (pic....

Checking the brake pedal
Checking the brake pedal height Check that the distance from the floor mat to the center of the top surface of the pedal seat is correct. Pedal Height (control value)...

Removing and installing the brake pedal
Removing Attention! The clearance between the brake light switch and the brake pedal is adjusted automatically when the brake light switch is inserted into the hole on...

Removal and installation of the main brake cylinder
Pic. 6.22. Dismantling components of the brake master cylinder: 1 – a socket of the gauge of level of a brake liquid; 2 - brake line; 3 - hose (models with manual...

Liquid Level Sensor Check
Disconnect the negative battery cable. Disconnect the sensor connector. Pic. 6.29. Liquid level sensor test circuit Check for continuity between the terminals of the...

Removal and installation of the vacuum amplifier of brakes
Pic. 6.30. Components of the vacuum brake booster: 1 - brake line; 2 - vacuum hose; 3 - connector; 4 - brake line; 5 - hinge axis; 6 - brake pedal assembly; 7 - brake...

Checking the vacuum brake booster
The operation of the vacuum brake booster, located on the engine shield, is based on the use of intake manifold vacuum and atmospheric air pressure. After completing...

Disassembly and assembly of the master cylinder
Attention! If the master cylinder body is damaged, replace the master cylinder assembly. When mounting the master cylinder in a vise, clamp only the protrusion of the...

Removal and installation of a forward brake disk
Pic. 6.38. Front brake mechanism: 1 - flexible hose; 2 - cover; 3 - guide pin; 4 - support; 5 - M-shaped spring; 6 – block of a brake disk; 7 - guide plate; 8 - support;...

Checking the brake disc and brake components
Check for corrosion, wear and damage on the inner walls of the cylinder. Replace cylinder body if necessary. Minor flaws caused by corrosion or foreign particles can be...

Replacing the front brake pads
When the cylinder body is open, do not press the brake pedal, otherwise the piston will pop out. Be careful not to damage the piston boot or allow oil to get on the...

Removal and installation of the back disk brake mechanism
Pic. 6.51. Rear brake components: 1 – a cable of parking brake system; 2 - brake line; 3 - clamp; 4 - clamp; 5 - cover; 6 - bolt; 7 - caliper, brake hose; 8 - case; 9 -...

Checking the parking brake system
Pic. 6.56. Parking brake circuit: 1 – the switch of parking brake system; 2 - adjusting nut; 3 – parking brake lever; 4 - clamp; 5 - parking brake cables Pull out the...

Parking brake adjustment
Start the engine and press the brake pedal several times. Stop the engine. Remove the ashtray behind the center console. Pic. 6.57. Parking brake adjusting nut Turn the...

Removal, check and installation of the rear ABS wheel speed sensor
Pic. 6.58. Rear ABS wheel speed sensor: 1 - connector; 2 - bolts of mounting brackets; 3 - sensor Checking clearance between wheel speed sensor and sensor rotor Pic....

Removal and installation of the hydraulic block of anti-blocking system of brakes
Attention! The internal components of the anti-lock brake hydraulic unit may be damaged if the unit is dropped on a hard surface. Be careful not to drop the anti-lock...

Specifications of brake system components
Table 6.1. Specifications of brake system components Table 6.6. Brake fluids

Purpose and functions of the DSC system
Table 6.2. Purpose and functions of the DSC system Table 6.3. Operation of the DSC warning lamp Table 6.4. Functions of the DSC HU/CM of the dynamic stability system

Possible malfunctions of the brake system, their causes and remedies
Table 6.5. Possible malfunctions of the brake system, their causes and remedies

This section is available on: russian, bulgarian, belarusian, ukrainian, serbian, croatian, romanian, polish, slovak, hungarian

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Mazda3 BK (2003-2009)