Hydraulic brake system

(canceled)

3:

• The hydraulic brake system according to claim 1,
• wherein said communicating device includes a manual passage connecting said manual hydraulic pressure source and said at least one of said brake cylinders,
• and wherein said flow restraining device is disposed between said second hydraulic-pressure generating device and said manual passage.

4:

• The hydraulic brake system according to claim 3, comprising a manual-passage cut-off valve which is provided in said manual passage and which is an electromagnetic valve switchable between at least an open state and a closed state by control of supply of an electric current to a solenoid thereof,
• wherein said flow restraining device is disposed between said second hydraulic-pressure generating device and a portion of said manual passage, said portion of said manual passage being closer to said at least one of said brake cylinders than said manual-passage cut-off valve.

5:

• The hydraulic brake system according to claim 1,
• wherein said communicating device includes (i) a common passage to which said at least one of said brake cylinders is connected via at least one individual passage, (ii) one of said at least one individual passage and (iii) an individual connection passage connecting said one of said at least one individual passage and said manual hydraulic pressure source,
• and wherein said flow restraining device is disposed between said second hydraulic-pressure generating device and said common passage.

6:

• The hydraulic brake system according to claim 5,
• wherein said one of said at least one individual passage is provided with an individual control valve which is configured to control the hydraulic pressure in one of said brake cylinders that is connected to said one of said at least one individual passage,
• and wherein said individual connection passage is connected to a portion of said one of said at least one individual passage, said portion of said one of said at least one individual passage being closer to one of said at least one of said brake cylinders than said individual control valve.

7:

• The hydraulic brake system according to claim 1,
• wherein said communicating device includes (i) a common passage to which said at least one of said brake cylinders is connected via at least one individual passage, (ii) one of said at least one individual passage and (iii) an individual connection passage connecting said one of said at least one individual passage and said manual hydraulic pressure source,
• and wherein said output hydraulic-pressure control device is disposed between said second hydraulic-pressure generating device and said common passage.

8:

• The hydraulic brake system according to claim 1, wherein said output hydraulic-pressure control device includes a linear control valve that is configured to control a difference between hydraulic pressure on a high-pressure side of said linear control valve and hydraulic pressure on a low-pressure side of said linear control valve by control of supply of an electric current to a solenoid thereof.

9:

• The hydraulic brake system according to claim 1, wherein said flow restraining device includes a relief valve that is configured to allow flow of the working fluid away from said second hydraulic-pressure generating device toward said manual-operation-associated brake line when the hydraulic pressure in said second hydraulic-pressure generating device is higher than the hydraulic pressure in said manual-operation-associated brake line by at least a given value.

10:

• The hydraulic brake system according to claim 1, wherein said flow restraining device includes a normally-closed electromagnetic valve which is switchable between at least an open state and a closed state by control of supply of an electric current to a solenoid thereof and which is to be placed in the closed state when the electric current is not being supplied to the solenoid thereof.

11:

• The hydraulic brake system according to claim 1,
• wherein said power hydraulic pressure source includes (i) a drive source and (ii) a working-fluid supplying portion which is to be activated by said drive source for thereby supplying the working fluid,
• and wherein said second hydraulic-pressure generating device includes an accumulator configured to retain the working fluid supplied from said working-fluid supplying portion such that the retained working fluid is being pressurized.

12:

• The hydraulic brake system according to claim 1, comprising a front-wheel common passage to which said brake cylinders of said hydraulic brakes provided for respective front right and left wheels as ones of the plurality of wheels are connected via respective two front-wheel individual passages,
• wherein said manual hydraulic pressure source is constituted by each of two pressurizing chambers of a tandem master cylinder which includes two pressurizing pistons and which is configured to generate the hydraulic pressures in said two pressurizing chambers by operation of said brake operating member, said two pressurizing chambers being connected to said respective two front-wheel individual passages via respective two front-wheel individual connection passages,
• and wherein said communicating device includes (i) said front-wheel common passage, (ii) one of said two front-wheel individual passages, and (iii) one of said two front-wheel individual connection passages which is connected to said one of said two front-wheel individual passages.

14:

• The hydraulic brake system according to claim 13, comprising manual-passage cut-off valves each of which is provided in a corresponding one of said two front-wheel individual connection passages and each of which is a normally-open electromagnetic valve that is to be placed in an open state when the electric current is not being supplied to a solenoid thereof.

15:

• The hydraulic brake system according to claim 12,
• wherein said one of said front-wheel individual connection passages is connected to one of said two pressurizing chambers,
• and wherein another one of said two pressurizing chambers is provided with a movement limiting portion that is configured to limit movements of said two pressurizing pistons.

(canceled)

18:

• The hydraulic brake system according to claim 1,
• wherein said communicating device includes (i) a common passage to which said at least one of said brake cylinders is connected via at least one individual passage, (ii) one of said at least one individual passage and (iii) an individual connection passage connecting said one of at least one individual passage and said manual hydraulic pressure source,
• and wherein said flow restraining device includes an electromagnetic valve that is disposed between said second hydraulic-pressure generating device and said common passage.