HomeBrake > Brake HydraulicsDorman M39540 Brake Master Cylinder
Part #: M39540

Dorman M39540 Brake Master Cylinder

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1 vehicles fit this part
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OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Ford, Aerostar
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Reliable Brake Master Cylinder for Ford Aerostar

The Dorman M39540 brake master cylinder is designed specifically for Ford Aerostar models, providing precise hydraulic control for your vehicle's braking system. This master cylinder features an aluminum construction and includes a reservoir and sensor to ensure optimal performance and safety.

Key Features of the Dorman M39540 Brake Master Cylinder

  • Compatible with Ford Aerostar vehicles
  • Master cylinder bore diameter of 0.938 inches for accurate hydraulic pressure
  • Durable aluminum material for long-lasting use
  • Includes reservoir and sensor for complete brake system integration
  • Three outlets with rearward outlet sizes of 7/16-24 and 3/8-24
  • Secondary outlet thread diameter of 9/16-18
  • Mounting hardware not included

Detailed Product Description

The Dorman M39540 brake master cylinder is engineered to meet the specific hydraulic requirements of the Ford Aerostar. Constructed from aluminum, this master cylinder offers corrosion resistance and strength, ensuring consistent brake fluid pressure. The included reservoir allows for proper fluid storage, while the integrated sensor supports brake system monitoring. With three outlets and precise thread sizes, this master cylinder facilitates secure connections to the brake lines, maintaining system integrity and safety.

Common Applications and Issues Addressed

  • Replacement for worn or leaking master cylinders in Ford Aerostar models
  • Restores proper brake fluid pressure and pedal feel
  • Resolves brake warning light issues related to sensor failure
  • Addresses fluid reservoir leaks or damage
  • Improves overall brake system reliability and safety

Installation Notes and Tips

  • Ensure compatibility with your specific Ford Aerostar year and model before installation
  • Bleed the brake system thoroughly after installation to remove air
  • Mounting hardware is not included; reuse existing hardware or acquire appropriate fasteners
  • Check all outlet connections for proper thread engagement and sealing
  • Follow manufacturer torque specifications to avoid damage

Quality Assurance and Warranty

Dorman manufactures the M39540 brake master cylinder to meet or exceed OEM standards for fit and function. The aluminum construction and integrated sensor contribute to reliable brake system performance. While mounting hardware is not included, the product is backed by Dorman's quality control processes. Please refer to Dorman's warranty policy for specific coverage details.

BrandDorman
Part NumberM39540
Master Cylinder Bore Diameter0.938
Master Cylinder MaterialAluminum
Mounting Hardware IncludedNo
Number of Outlets3
Package ContentsMaster Cylinder
Rearward Outlet Size7/16-24 & 3/8-24
Reservoir IncludedYes
Secondary Outlet Thread Diameter9/16-18
Sensor IncludedYes

This part fits 1 vehicles. Search below:

YearMakeModelPositionNotes
1986FordAerostarN/AFits 15/16" bore size drum brakes on multiple vehicle models.

* 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:

10-40161218313-4016130.6500418M28883-42004E69Z2140AF112593M-85004M2183M900494MC251830MC39540

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