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ABS Pump
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
Genuine Porsche ABS / PSM control unit cover.
Fits
- Porsche 993 (911) 1994–98
- Porsche 993 (911) C2 1994–97
- Porsche 993 (911) C4 1994–97
- Porsche 993 (911) RS 1994–97
- Porsche 993 (911) C2S 1994–97
- Porsche 993 (911) C4S 1994–97
- Porsche 993 (911) Turbo 1994–96
- Porsche 993 (911) GT2 1994–97
- Porsche 993 (911) Turbo S 1994–97
- Porsche 996 (911) 1997–2005
- Porsche 996 C2 3.4L 1997–08/01
- Porsche 996 C4 3.4L 1997–08/01
- Porsche 996 C2 3.6L 09/01–2005
- Porsche 996 C4 3.6L 09/01–2005
- Porsche 996 C4S 3.6L 09/01–2005
Check fitment for your specific vehicle (model, year, engine) before ordering. Confirm factory equipment and applicable option codes as well.
What This Product Does
This cover belongs to the control-unit portion of the hydraulic anti-lock braking assembly. Its role is to cover that section in the arrangement identified by the relevant exploded diagram; it does not sense wheel speed, operate the pump or regulate hydraulic pressure.
Functions
- Provides the specified covering for the ABS/PSM control-unit section.
- Reinstates the cover position within the illustrated assembly.
- Allows renewal of a missing or damaged cover without identifying it as a complete control unit.
Technical Details
- Manufacturer: Porsche; part number: 99661803800.
- Diagram designation: cover control unit; also described as cover.
- Recorded quantity: 1 per illustrated assembly.
Symptoms of Fault
- Visible cracking, deformation or other damage to the cover.
- An uncovered control-unit section where the original component is missing.
- Poor seating or insecure retention when the cover is inspected.
Why Replacement Matters
Replacing a defective cover returns this part of the assembly to its specified layout. Inspect its seating and surrounding attachment points before fitting. Dashboard ABS/PSM alerts require separate fault investigation: a replacement cover is not a remedy for sensor, wiring, hydraulic or controller defects.
FAQs
Is the controller supplied with this cover?
No. The diagram treats 99661803800 as an individual cover, separate from the hydraulic assembly and its associated components.
Can this resolve an ABS warning?
The cover alone does not correct system faults. Diagnosis should assess stored faults, electrical supply, wiring, sensors and hydraulic operation as appropriate.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99661803800
The product you are viewing cross references to these numbers
Porsche Hydraulics & ABS Pumps | Precision Braking & Stability Control Performance
Hydraulic systems and ABS pumps are essential to your Porsche’s braking and traction control systems. The ABS (Anti-lock Braking System) pump regulates brake fluid pressure during hard braking, preventing wheel lockup and maintaining grip. Together with hydraulic control units, these components ensure safe, balanced, and responsive braking under all conditions.
At Design911, we supply premium hydraulic units and ABS pumps that meet or exceed original performance specifications. Built from precision-machined materials and designed for exact pressure regulation, our components deliver consistent braking performance, long-term reliability, and improved safety across all Porsche models.
Whether you’re restoring a classic system or servicing a modern Porsche with advanced driver aids, our hydraulic and ABS components ensure stable, dependable performance mile after mile.
What Do Hydraulic Systems & ABS Pumps Do?
Hydraulic units and ABS pumps manage brake pressure and hydraulic flow within the braking system to provide precise control and improved stability.
Core Functions:
- ABS
Pump: Prevents wheel lock by modulating brake pressure during heavy
braking.
- Hydraulic
Unit: Distributes fluid to maintain even brake force across all
wheels.
- Supports traction and stability control functions.
- Enhances braking response and driver confidence.
- Maintains consistent brake pressure in all road conditions.
Without a functioning ABS pump or hydraulic control unit, braking performance can degrade dramatically, increasing stopping distances and risking wheel lock or skidding.
Why Do Hydraulics & ABS Pumps Fail or Malfunction?
Because they operate under high pressure and heat, hydraulic systems and ABS pumps can wear or fail over time.
Common Causes of Failure Include:
- Internal corrosion from moisture-contaminated brake fluid.
- Electrical failure in the ABS control module or pump motor.
- Clogged or leaking hydraulic valves.
- Damaged seals or worn solenoids.
- Overheating due to prolonged or aggressive braking.
When these components fail, you may experience warning lights on the dashboard, pulsating brakes, or complete loss of ABS and traction control functionality.
Why Replace or Upgrade Your Porsche Hydraulic or ABS Pump?
Replacing a worn or faulty hydraulic system or ABS pump restores full braking efficiency, improves safety, and ensures proper communication between brake and stability systems.
Key Benefits:
- Restores responsive, balanced braking performance.
- Prevents loss of ABS and traction control functions.
- Eliminates brake pedal pulsation and system warning lights.
- Ensures correct fluid pressure distribution across all wheels.
- Compatible with Porsche 911, Cayman, Boxster, Panamera, Macan, Cayenne, and classic models.
- Ideal for maintenance, system overhauls, or performance upgrades.
Regular brake fluid servicing and inspection help extend the lifespan of your ABS pump and hydraulic components.
Highlights
- Precision-engineered Porsche hydraulic and ABS pump units.
- Designed for reliability, pressure accuracy, and safety.
- Direct-fit replacements for both modern and classic Porsche models.
- Prevents brake fade, lockup, and traction loss.
- Essential for performance driving, restoration, or safety repairs.
- Built from corrosion-resistant materials for long-lasting service life.
