Rear brake disc rotor, Porsche 911/930 (OE part no. 90135204114)  ❭  90135204114

Rear brake disc rotor by Porsche for selected 911 and 930 models. This vented rear brake disc is specified as 290.0 mm diameter with a 20.0 mm disc thickness and 18.7 mm minimum thickness.

What This Product Does Provides the friction surface used by the brake pads to slow the vehicle and helps manage heat during braking. As a genuine Porsche part, it is intended to support correct fit and factory specification where applicable.

Functions

• Provides a braking surface for the rear pads
• Helps dissipate heat through a vented disc design
• Supports consistent rear brake operation
• Fits a 5-hole hub arrangement

Symptoms of Fault

• Brake judder or vibration under braking
• Scoring or a pronounced lip on the disc edge
• Heat marks or visible surface wear
• Rust on the braking surface or internal vents
• Squealing or other braking noise linked to disc wear
• Visible wear to discs and pads

Why Replacement Matters

Brake discs are commonly replaced when the existing parts are worn, corroded, cracked or below service limits. On older 911 and 930 models, renewing brake components can help maintain correct braking function and preserve factory-specification fitment. For this type of part, it is also sensible to confirm the latest correct application by part number or vehicle details before fitting.

Fits

• 911 & 912 (1965–1989)
• 911 1965–1968 2.0L / 912 SWB (F)
• 911 1968–1973 2.2L / 2.4L / 2.7L RS LWB (F)
• 911 1974–1977 2.7L / 1976–77 3.0 Carrera
• 911 1975–1977 3.0L Turbo (930)
• 911 1978–1983 3.0L / SC

Check fitment for your specific vehicle (model, year, engine) before ordering.