Importance

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Abstract

a brake apparatus capable of improving a brake operation feeling is provided. A brake apparatus includes a stroke simulator including a piston configured to be activated axially in a cylinder with use of brake fluid supplied from a master cylinder. The piston divides an inside of the cylinder into at least a positive pressure chamber and a backpressure chamber. The piston is configured in such a manner that a pressure-receiving area racing the backpressure chamber is smaller than a pressures-receiving area facing the positive pressure chamber. The stroke simulator is configured to generate, thorough the activation of the piston, an operation reaction force according to a brake operation performed by a driver. The brake apparatus further includes a second oil passage provided between the positive pressure chamber and the master cylinder, a third oil passage connecting between the backpressure chamber and the first oil passage, a fourth oil passage connecting between the backpressure chamber and the reservoir tank, and a switching unit configured to switch a connection of the backpressure chamber between a connection between the backpressure chamber and the first oil passage and a connection between the backpressure chamber and the reservoir tank.

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First Claim