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MPA Electrical NM4321 Brake Master CylinderOE Quality 60-Day Returns
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Part #: NM4321

MPA Electrical NM4321 Brake Master Cylinder

New with front disc brakes
⚙️ 36 vehicles fit this part
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Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$179.07Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
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✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
✅OE Direct Replacement — Bolt-on fit, no modifications needed
📦New with front disc brakes
🚗Fitment: Ram, ProMaster 1500, ProMaster 2500, and ProMaster 3500
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST
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MPA Electrical NM4321 Brake Master Cylinder
BrandMPA Electrical
Part NumberNM4321
PositionNew with front disc brakes
Reservoir MaterialPlastic
Mounting Hardware IncludedNo
Grade TypeStandard replacement
Gasket Or Seal IncludedYes
Mounting Hole Quantity2
Master Cylinder Bore Diameter1.062
Brake Booster IncludedNo
Master Cylinder Cap IncludedYes
Master Cylinder MaterialAluminum
Push Rod IncludedNo
Reservoir IncludedYes
Sensor IncludedNo
Mounting Hole Diameter0.433
Mounting Bracket IncludedNo
Brake Pressure Switch(s) IncludedNo
Product ConditionNew

This part fits 36 vehicles. Search below:

YearMakeModelPositionNotes
2025RamProMaster 1500N/ANew with front disc brakes
2025RamProMaster 2500N/ANew with front disc brakes
2025RamProMaster 3500N/ANew with front disc brakes
2024RamProMaster 1500N/ANew with front disc brakes
2024RamProMaster 2500N/ANew with front disc brakes
2024RamProMaster 3500N/ANew with front disc brakes
2023RamProMaster 1500N/ANew with front disc brakes
2023RamProMaster 2500N/ANew with front disc brakes
2023RamProMaster 3500N/ANew with front disc brakes
2022RamProMaster 1500N/ANew with front disc brakes
2022RamProMaster 2500N/ANew with front disc brakes
2022RamProMaster 3500N/ANew with front disc brakes
2021RamProMaster 1500N/ANew with front disc brakes
2021RamProMaster 2500N/ANew with front disc brakes
2021RamProMaster 3500N/ANew with front disc brakes
2020RamProMaster 1500N/ANew with front disc brakes
2020RamProMaster 2500N/ANew with front disc brakes
2020RamProMaster 3500N/ANew with front disc brakes
2019RamProMaster 1500N/ANew with front disc brakes
2019RamProMaster 2500N/ANew with front disc brakes
2019RamProMaster 3500N/ANew with front disc brakes
2018RamProMaster 1500N/ANew with front disc brakes
2018RamProMaster 2500N/ANew with front disc brakes
2018RamProMaster 3500N/ANew with front disc brakes
2017RamProMaster 1500N/ANew with front disc brakes
2017RamProMaster 2500N/ANew with front disc brakes
2017RamProMaster 3500N/ANew with front disc brakes
2016RamProMaster 1500N/ANew with front disc brakes
2016RamProMaster 2500N/ANew with front disc brakes
2016RamProMaster 3500N/ANew with front disc brakes
2015RamProMaster 1500N/ANew with front disc brakes
2015RamProMaster 2500N/ANew with front disc brakes
2015RamProMaster 3500N/ANew with front disc brakes
2014RamProMaster 1500N/ANew with front disc brakes
2014RamProMaster 2500N/ANew with front disc brakes
2014RamProMaster 3500N/ANew with front disc brakes

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

68211341AA68211341AB68211342AA68428495AA68428495AB

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

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