Mazda Training manual — part 100

Dynamic Driving Safety Systems

DSC

L2003_02035

1

Master cylinder

8

Outlet solenoid valve

2

DSC HU/CM

9

Brake calliper LR

3

Damper chamber

10

Brake calliper RF

4

Pump motor

11

Flow control valve

5

Pump

12

Stability control solenoid valve

6

Reservoir

13

Traction control solenoid valve

7

Inlet solenoid valve

14

Brake fluid pressure sensor

Curriculum Training

02-59

DSC

Dynamic Driving Safety Systems

Pressure Reduction Mode

•

When the CM determines that the applied brake pressure has to be reduced to allow the
vehicle to follow its desired path, it switches to pressure reduction mode and activates
the high-pressure pump. The only valve that changes its condition compared to the
pressure hold mode is the RF outlet solenoid valve, which now opens as a reaction to a
signal from the CM.

•

The brake fluid pressure decreases inside the brake calliper and as a result the applied
brake force is reduced.

•

Pressure is built up between the high-pressure pump and the inlet solenoid valve of the
brake calliper, to be able to apply brake force again if required. The CM repeats the
operation as necessary from the beginning.

LF-RR

OFF (open)

RF-LR

ON (closed)

LF-RR

OFF (closed)

RF-LR

OFF (closed)

LF

OFF (open)

RF
LR
RR

OFF (open)

LF

OFF (closed)

RF

ON (open)

LR
RR

Pump motor

ON (operating)

L2003_T02018

Stability control solenoid valve

ON (closed)

OFF (closed)

Traction control solenoid valve

Inlet solenoid valve

Outlet solenoid valve

02-60 Curriculum

Training

Dynamic Driving Safety Systems

DSC

L2003_02036

1

Master cylinder

8

Outlet solenoid valve

2

DSC HU/CM

9

Brake calliper LR

3

Damper chamber

10

Brake calliper RF

4

Pump motor

11

Flow control valve

5

Pump

12

Stability control solenoid valve

6

Reservoir

13

Traction control solenoid valve

7

Inlet solenoid valve

14

Brake fluid pressure sensor

Curriculum Training

02-61

DSC

Dynamic Driving Safety Systems

Bleeding

NOTE: In most cases it is not necessary to bleed the HU with the aid of the M-MDS during

exchange of the brake fluid. Always follow the procedure of the corresponding W/M.

•

The bleeding procedure for the DSC HU is similar to that for an ABS HU with TCS. If
possible, the stability control valves must be switched on and bled in addition.

NOTE: Always perform the manual bleeding procedure before performing any bleeding

procedure with the aid of the M-MDS

02-62 Curriculum

Training