47070-52010 / 47070-52020 (Toyota OEM Brake Booster / ABS Pump Assembly)  
These part numbers refer to Toyota's hybrid-specific electric brake booster pumps with accumulators, commonly known as "ABS pump assemblies" or "brake booster pumps," used in compact hybrid vehicles. 

1. Part Information  
47070-52010: Early version, commonly used from 2011–2014  
47070-52020: Upgraded replacement (47070-52010 → 52020), universal for 2012–2019  
Full name: Pump Assy, Brake Booster (Brake booster pump assembly with accumulator and motor)  

2. Compatible Models (Toyota / Lexus Hybrid)  
Toyota Prius C (Aqua) NHP10: 2012–2019 (1.5L hybrid)  
Toyota Vitz/Yaris NHP130: 2017–2018 hybrid  
Toyota Corolla Axio/Fielder NKE165: 2013–2018 hybrid  
Toyota Sienta NHP170: 2015–2018 hybrid  

3. Function and Common Issues  
Function: Electric hydraulic assist + ABS pressure storage, replacing traditional vacuum boosters; designed specifically for hybrid vehicles  
Common faults:  
Abnormal motor noise or insufficient pressure → hard brake pedal, weak braking assistance  
Accumulator aging → brake assist rapidly diminishes after engine shutdown  
Fault codes: C1250, C1391, P055A, etc.