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1
how are the brake pads released from the brake disc after the brake pedal is released?
the brake disc pushes the brake pads back.
by vacuum created in the braking system.
by a spring behind the brake piston.
by the rubber square - cut seal around the brake piston.
ok

Explanation:

When the brake pedal is released, the rubber square - cut seal around the brake piston (also known as a caliper seal) flexes back to its original shape. This flexing action pulls the brake piston back, which in turn releases the brake pads from the brake disc. The other options are incorrect:

• A spring behind the brake piston is not the common mechanism for releasing brake pads in a typical disc - brake system (where the square - cut seal is the primary release mechanism).
• Vacuum in the braking system is mainly related to power assist (e.g., in the brake booster) and not the release of brake pads from the disc.
• The brake disc does not push the brake pads back; it is the movement of the piston (controlled by the seal) that releases the pads.

Answer:

By the rubber square - cut seal around the brake piston.