Practice question

A hydraulic disc brake system works on the principle that...

Pressing the brake lever compresses air in the brake line, which mechanically pulls the brake shoes
Pressure applied to brake fluid at the master cylinder is transmitted through the brake line to push the caliper piston and pads against the disc
The brake disc generates its own hydraulic pressure when it heats up
Brake fluid ignites to release stored chemical energy that applies the brakes

Answer: B — Pressure applied to brake fluid at the master cylinder is transmitted through the brake line to push the caliper piston and pads against the disc

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