Brake Caliper Bleeder Valve, With Dust Cap. Porsche 918 / 981 / 982 / 991 / 997  ❭  99735291900

Installed in the brake caliper, the bleeder valve provides a controlled point for releasing trapped air and old brake fluid when bleeding or servicing the hydraulic braking system. When closed, the valve must seal securely to maintain the integrity of the hydraulic circuit.

Because the braking system depends on correctly pressurised hydraulic fluid, a damaged, corroded, seized or leaking bleeder valve should not be ignored. Replacement helps ensure the caliper can be properly bled while maintaining a reliable fluid-tight seal during normal braking operation.

What This Product Does:
The bleeder valve provides a service point for removing air and old brake fluid from the hydraulic brake system.

During the brake-bleeding procedure, the valve is opened in a controlled manner so that brake fluid and trapped air can leave the caliper.

Once bleeding is complete, the valve is tightened to create a secure hydraulic seal.

Its main functions are to:

• Provide a controlled brake-bleeding point
• Allow trapped air to be removed from the caliper
• Allow old brake fluid to be flushed during servicing
• Help achieve a firm and consistent brake pedal
• Seal the hydraulic system when closed
• Support correct brake maintenance and fluid replacement

Although physically small, the bleeder valve performs an important role in maintaining and servicing the braking system.

Symptoms Of Wear Or Failure:
Common signs that a brake caliper bleeder valve may require replacement include:

• Brake fluid leaking around the valve
• Valve will not seal correctly
• Seized bleeder valve
• Heavy corrosion
• Rounded or damaged hex
• Damaged threads
• Damaged valve seating surface
• Valve broken during removal
• Restricted or blocked fluid passage
• Difficulty bleeding the caliper
• Brake fluid continues to seep after tightening
• Missing or damaged dust cap
• Previous overtightening damage

Any brake-fluid leak should be investigated immediately.

Why Replacement Matters:
Replacing a worn, seized or damaged brake caliper bleeder valve helps maintain both the serviceability and hydraulic integrity of the brake system.

A correctly functioning replacement helps:

• Provide a reliable brake-bleeding point
• Allow trapped air to be removed
• Support proper brake-fluid changes
• Maintain a secure hydraulic seal
• Prevent brake-fluid leakage from a defective valve
• Restore future serviceability of the caliper
• Protect the bleed point with the supplied dust cap
• Support consistent brake-system operation

Because this component is part of the hydraulic braking system, defects should be addressed promptly.