HomeBrake > Brake HydraulicsDorman M39451 Brake Master Cylinder
Part #: M39451

Dorman M39451 Brake Master Cylinder

⚙️ 82 vehicles fit this part
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OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Chrysler, Dodge, and Plymouth, 600, Acclaim, Aries, Charger, Daytona, Lancer, Laser, LeBaron, New Yorker, Rampage, Reliant, Shadow, Spirit, Sundance, Town & Country, and Turismo
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Reliable Brake Master Cylinder for Chrysler, Dodge, and Plymouth Vehicles

The Dorman M39451 Brake Master Cylinder is engineered to restore proper brake hydraulics in select Chrysler, Dodge, and Plymouth models. Designed with an aluminum body and a 21mm bore diameter, this master cylinder includes a reservoir to ensure consistent brake fluid delivery and performance.

Key Features of the Dorman M39451 Brake Master Cylinder

  • Constructed from durable aluminum for corrosion resistance and longevity
  • Includes an integrated reservoir for brake fluid storage
  • 21mm master cylinder bore diameter for precise hydraulic pressure
  • Two outlets with 3/8-24 inch thread diameter for rearward and secondary connections
  • Compatible with multiple Chrysler, Dodge, and Plymouth models including Charger, LeBaron, and Town & Country

Detailed Product Description

The Dorman M39451 Brake Master Cylinder is designed to meet the hydraulic braking needs of various Chrysler, Dodge, and Plymouth vehicles such as the Charger, Acclaim, and Sundance. Its aluminum construction provides a lightweight yet durable solution resistant to rust and wear. The 21mm bore diameter ensures accurate pressure generation for effective braking response. This master cylinder comes with a built-in reservoir, eliminating the need for a separate fluid container, and features two outlets with standardized 3/8-24 inch threads for secure brake line connections. Note that mounting hardware is not included with this part.

Common Applications and Issues Addressed

  • Restores brake pressure in vehicles experiencing soft or spongy brake pedal feel
  • Replaces master cylinders with leaking or damaged reservoirs
  • Solves brake fluid contamination or loss due to cracked or corroded master cylinders
  • Addresses brake failure symptoms caused by internal seal wear or bore damage
  • Ensures proper hydraulic function in Chrysler, Dodge, and Plymouth models listed in the fitment

Installation Notes and Tips

  • Ensure brake system is properly bled after installation to remove air pockets
  • Verify compatibility with your specific vehicle model and year before installation
  • Use appropriate brake fluid as specified by the vehicle manufacturer
  • Inspect brake lines and fittings for wear or damage during replacement
  • Mounting hardware must be sourced separately as it is not included

Quality Assurance and Warranty Information

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The M39451 Brake Master Cylinder undergoes rigorous quality control to ensure reliable performance. Warranty coverage details can be obtained from the product documentation or the manufacturer’s website.

BrandDorman
Part NumberM39451
Mounting Hardware IncludedNo
Master Cylinder Bore Diameter21
Master Cylinder MaterialAluminum
Reservoir IncludedYes
Sensor IncludedNo
Number of Outlets2
Package ContentsMaster cylinder
Rearward Outlet Size3/8-24 in
Secondary Outlet Thread Diameter3/8-24 in

This part fits 82 vehicles. Search below:

YearMakeModelSubmodelPositionNotes
1994DodgeShadowN/ABrake Master Cylinder with a 21mm bore size
1994PlymouthSundanceN/ABrake Master Cylinder with a 21mm bore size
1993DodgeShadowN/ABrake Master Cylinder with a 21mm bore size
1993PlymouthSundanceN/ABrake Master Cylinder with a 21mm bore size
1992DodgeShadowN/ABrake Master Cylinder with a 21mm bore size
1992PlymouthSundanceN/ABrake Master Cylinder with a 21mm bore size
1991DodgeShadowN/ABrake Master Cylinder with a 21mm bore size
1991PlymouthSundanceN/ABrake Master Cylinder with a 21mm bore size
1990DodgeShadowN/ABrake Master Cylinder with a 21mm bore size
1990DodgeSpiritN/ABrake Master Cylinder with a 21mm bore size
1990PlymouthSundanceN/ABrake Master Cylinder with a 21mm bore size
1989ChryslerLeBaronGTSN/ABrake Master Cylinder with a 21mm bore size
1989DodgeAriesN/ABrake Master Cylinder with a 21mm bore size
1989DodgeLancerN/ABrake Master Cylinder with a 21mm bore size
1989DodgeShadowN/ABrake Master Cylinder with a 21mm bore size
1989DodgeSpiritN/ABrake Master Cylinder with a 21mm bore size
1989PlymouthAcclaimN/ABrake Master Cylinder with a 21mm bore size
1989PlymouthReliantN/ABrake Master Cylinder with a 21mm bore size
1989PlymouthSundanceN/ABrake Master Cylinder with a 21mm bore size
1988ChryslerLeBaronN/ABrake Master Cylinder with a 21mm bore size
1988ChryslerNew YorkerN/ABrake Master Cylinder with a 21mm bore size
1988ChryslerTown & CountryN/ABrake Master Cylinder with a 21mm bore size
1988Dodge600N/ABrake Master Cylinder with a 21mm bore size
1988DodgeAriesN/ABrake Master Cylinder with a 21mm bore size
1988DodgeDaytonaN/ABrake Master Cylinder with a 21mm bore size
1988DodgeLancerN/ABrake Master Cylinder with a 21mm bore size
1988DodgeShadowN/ABrake Master Cylinder with a 21mm bore size
1988PlymouthReliantN/ABrake Master Cylinder with a 21mm bore size
1988PlymouthSundanceN/ABrake Master Cylinder with a 21mm bore size
1987ChryslerLeBaronBaseN/ABrake Master Cylinder with a 21mm bore size
1987ChryslerLeBaronPremiumN/ABrake Master Cylinder with a 21mm bore size
1987ChryslerLeBaronTurboN/ABrake Master Cylinder with a 21mm bore size
1987ChryslerNew YorkerN/ABrake Master Cylinder with a 21mm bore size
1987ChryslerTown & CountryN/ABrake Master Cylinder with a 21mm bore size
1987Dodge600N/ABrake Master Cylinder with a 21mm bore size
1987DodgeAriesN/ABrake Master Cylinder with a 21mm bore size
1987DodgeChargerN/ABrake Master Cylinder with a 21mm bore size
1987DodgeDaytonaN/ABrake Master Cylinder with a 21mm bore size
1987DodgeShadowN/ABrake Master Cylinder with a 21mm bore size
1987PlymouthReliantN/ABrake Master Cylinder with a 21mm bore size
1987PlymouthSundanceN/ABrake Master Cylinder with a 21mm bore size
1986ChryslerLaserN/ABrake Master Cylinder with a 21mm bore size
1986ChryslerLeBaronN/ABrake Master Cylinder with a 21mm bore size
1986ChryslerNew YorkerN/ABrake Master Cylinder with a 21mm bore size
1986ChryslerTown & CountryN/ABrake Master Cylinder with a 21mm bore size
1986Dodge600N/ABrake Master Cylinder with a 21mm bore size
1986DodgeAriesN/ABrake Master Cylinder with a 21mm bore size
1986DodgeChargerN/ABrake Master Cylinder with a 21mm bore size
1986DodgeDaytonaN/ABrake Master Cylinder with a 21mm bore size
1986DodgeLancerN/ABrake Master Cylinder with a 21mm bore size
1986PlymouthReliantN/ABrake Master Cylinder with a 21mm bore size
1985ChryslerLaserN/ABrake Master Cylinder with a 21mm bore size
1985ChryslerLeBaronN/ABrake Master Cylinder with a 21mm bore size
1985ChryslerNew YorkerN/ABrake Master Cylinder with a 21mm bore size
1985ChryslerTown & CountryN/ABrake Master Cylinder with a 21mm bore size
1985Dodge600N/ABrake Master Cylinder with a 21mm bore size
1985DodgeAriesN/ABrake Master Cylinder with a 21mm bore size
1985DodgeChargerN/ABrake Master Cylinder with a 21mm bore size
1985DodgeDaytonaN/ABrake Master Cylinder with a 21mm bore size
1985DodgeLancerN/ABrake Master Cylinder with a 21mm bore size
1985PlymouthReliantN/ABrake Master Cylinder with a 21mm bore size
1985PlymouthTurismoN/ABore: 21 mm; w/Power Brakes
1984ChryslerLaserN/ABrake Master Cylinder with a 21mm bore size
1984ChryslerLeBaronN/ABrake Master Cylinder with a 21mm bore size
1984ChryslerNew YorkerN/ABrake Master Cylinder with a 21mm bore size
1984ChryslerTown & CountryN/ABrake Master Cylinder with a 21mm bore size
1984Dodge600N/ABrake Master Cylinder with a 21mm bore size
1984DodgeAriesN/ABrake Master Cylinder with a 21mm bore size
1984DodgeChargerN/ABrake Master Cylinder with a 21mm bore size
1984DodgeDaytonaN/ABrake Master Cylinder with a 21mm bore size
1984DodgeRampageN/ABrake Master Cylinder with a 21mm bore size
1984PlymouthReliantN/ABrake Master Cylinder with a 21mm bore size
1984PlymouthTurismoN/ABore: 21 mm; w/Power Brakes
1983ChryslerLeBaronN/ABrake Master Cylinder with a 21mm bore size
1983ChryslerNew YorkerN/ABrake Master Cylinder with a 21mm bore size
1983ChryslerTown & CountryN/ABrake Master Cylinder with a 21mm bore size
1983Dodge600N/ABrake Master Cylinder with a 21mm bore size
1983DodgeAriesN/ABrake Master Cylinder with a 21mm bore size
1983DodgeChargerN/ABrake Master Cylinder with a 21mm bore size
1983DodgeRampageN/ABrake Master Cylinder with a 21mm bore size
1983PlymouthReliantN/ABrake Master Cylinder with a 21mm bore size
1983PlymouthTurismoN/ABore: 21 mm; w/Power 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:

10-19451081341194513-1945130.6303218M24225394514271388783-32032F108134M-83032M1945M900442MC108134

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