HYDRAULIC DISC BRAKE
A hydraulic disc brake system uses hydraulic fluid in a sealed system to transmit braking force from the brake lever to the brake caliper. When the brake lever is squeezed, a piston in the master cylinder at the lever compresses the fluid, which travels through the brake hose and pushes pistons in the caliper outward, pressing the brake pads against the rotor.
Advantages over Mechanical Disc Brakes
- Superior modulation: Finer, more intuitive control over braking force.
- More power with less effort: Requires less finger force to achieve strong braking. Reduces hand fatigue on long descents.
- Automatic pad adjustment: The caliper pistons automatically extend as the pads wear, maintaining lever feel. No cable adjustment is required.
- Consistent performance in wet conditions.
Maintenance
The main maintenance requirement for hydraulic disc brakes is periodic "bleeding" of the brake lines. Over time, air can enter the system, causing a spongy lever feel. Bleeding involves purging the old fluid and air from the system and replacing it with fresh fluid. Bleeds are typically needed every 1-2 years, or when a spongy lever feel is noticed.
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