Here’s a detailed overview of the ABS pump (ABS hydraulic unit) for the Proton Satria Neo:

🔧 What is it & which part numbers?

• It’s an integrated hydraulic‑electronic unit that combines:
  
• A high‑pressure pump motor,
• Solenoid valves for each wheel circuit, and
• The electronic control module (ABS ECU) in one compact housing  .
• 
  
• Key part numbers:
  
• OEM code: PW868544 (also referenced as PW891998)  .
• Bosch numbers: 0265800438, 0265231573—standard Bosch ABS pump modules used in Proton Neo models  .
• 
  

📦 Fitment & condition

• Fits Proton Satria Neo 2nd-gen (BS3/BS6) built between 2006–2015  .
• Available as new genuine Proton units and reconditioned Bosch imports, depending on source and price.

🛠 What does it do?

1. Monitors wheel speed sensors and brake pressure sensors via its internal ECU.
2. When it detects a wheel about to lock, it rapidly cycles valves—reducing, holding, or increasing fluid pressure to that wheel.
3. The pump motor restores fluid pressure as valves release it, maintaining stable braking  .
4. You’ll feel a pulsing in the brake pedal during ABS activation—this is normal ().

✅ Symptoms of failure

• ABS warning light illuminated.
• ABS not activating on braking tests (e.g., 40–50 km/h panic stop)  .
• No fluid leaks, but pump motor doesn’t run or runs continuously (sign of internal fault)  .
• Commonly triggered by corrosion, water ingress, or connector issues (e.g., after engine bay cleaning) ().

✅ Replacement & repair options

• Buy a brand-new genuine unit (PW868544) from suppliers like Miles Auto Parts or Carousell  .
• Choose a refurbished Bosch unit (OEM Bosch 0265800438) backed by warranty  .
• Rebuild services available—entire unit is tested, reassembled and reprogrammed before return ().

🛒 Current product option

• Genuine Proton Satria Neo ABS Actuator Brake Pump PW868544 – A brand-new genuine unit for ~RM 550, fits 2006–2015 Neo, ideal for direct OEM replacement.