Fixed Mount Brake Caliper Brake calipers can have from 1 to 6 pistons depending on manufacturer design. All brake calipers are fitted with a brake fluid bleeder. This bleeder is designed to allow air to escape from the system. If air is allowed in the system it can cause brake operation failure. A brake caliper piston is sealed to the brake caliper housing using a main piston seal. This seal allows the piston to move back and forth without allowing brake fluid to leak out. This seal is protected by a dust seal that keeps debris from contaminating the integrity of the seal. The brake system should always be flushed and bled regularly to prevent moisture from creating rust. This rust can cause the caliper piston seal to fail allowing brake fluid to leak. If a brake caliper is leaking a rebuilt or new caliper is needed.
Floating Brake Caliper A rebuild kit replaces the main seal and dust guard. A high pressure brake hose is connected from the car frame or body to the caliper. This hose is sealed against the brake caliper using copper sealing washers. When removing this hose it's recommended that a new copper sealing washer is installed. Anytime the brake system is opened a brake system bleed is necessary. Visit - Bleed brake system
Exploded Brake Caliper (Floating)