Quality replacement brake master cylinder, designed to match the original braking system specifications for correct fitment and reliable hydraulic pressure.
Supplied as a complete new assembly with new internal components, including pistons, return springs, seals and associated components.
🔧 Features
✅ New replacement master cylinder assembly
✅ Vehicle-specific design
✅ Manufactured to match OE bore size and finish
✅ Designed to maintain correct hydraulic pressure
✅ Helps prevent internal fluid bypass and loss of braking pressure
✅ New pistons and return springs
✅ EPDM and SBR rubber components for resistance to heat, corrosion and brake fluid
✅ Reservoir designed to match the original mounting configuration where supplied
✅ Pressure tested for reliability and performance
✅ Meets applicable SAE J1153 and SAE J1154 requirements
✅ Corrosion-resistant coated bleeder components
🔢 OEM / Interchange Part Numbers
- B37F-43-400
- B3YF-43-40Z
- B3YF-43-40ZA
⚠️ Important Fitment Information
Please compare the part number and master cylinder configuration with your original unit before ordering.
Mazda vehicles can use different brake master cylinders depending on model, year, engine, transmission, ABS configuration and market specification.
🔵 Not sure if this fits?
Please provide your VIN or chassis number before ordering.
