HomeBrake > Brake HydraulicsDorman M630986 Brake Master Cylinder
Part #: M630986

Dorman M630986 Brake Master Cylinder

⚙️ 18 vehicles fit this part
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OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Acura and Honda, Civic and ILX
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Reliable Brake Master Cylinder for Acura and Honda Vehicles

The Dorman M630986 brake master cylinder is engineered to restore proper brake hydraulics in select Acura and Honda models. Designed with durable cast iron construction, this master cylinder ensures consistent braking performance for your Civic or ILX.

  • Constructed from cast iron for strength and durability
  • Master cylinder bore diameter of 0.8125 inches for precise hydraulic control
  • Two mounting holes for secure installation
  • Includes two outlets with M12x1.0 thread diameter for rearward and secondary outlets
  • Removable reservoir type for maintenance convenience

Detailed Product Description

The Dorman M630986 brake master cylinder is a critical component in the brake hydraulics system, responsible for converting pedal pressure into hydraulic force. This part features a 0.8125-inch bore diameter, which is essential for maintaining proper brake fluid pressure and ensuring responsive braking. The master cylinder is made from cast iron, providing long-lasting durability under demanding conditions. It includes two outlets with M12x1.0 thread sizes, compatible with standard brake line fittings. The removable reservoir design allows for easier brake fluid inspection and replacement. Note that this unit does not include mounting hardware, brake booster, push rod, reservoir, bleeder hoses, sensors, or mounting brackets.

Compatible Vehicles and Applications

  • Designed specifically for Acura Civic and Honda Civic models
  • Also compatible with Acura ILX and Honda ILX vehicles
  • Ideal for replacing worn or leaking master cylinders in brake hydraulic systems
  • Restores proper brake pedal feel and hydraulic pressure
  • Addresses issues such as brake fluid leaks, spongy brake pedal, and reduced braking efficiency

Installation Notes and Tips

When installing the Dorman M630986 brake master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Since mounting hardware is not included, retain original fasteners or acquire appropriate replacements. Verify compatibility with your specific Acura or Honda model year before installation. Use proper tools to avoid damage to the M12x1.0 outlet threads during brake line connection.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications, ensuring reliable performance and fitment. The cast iron construction provides resistance to wear and corrosion. While specific warranty details are not provided here, Dorman typically offers limited warranties on their brake hydraulic components. Consult product documentation or the manufacturer for exact warranty terms.

BrandDorman
Part NumberM630986
Mounting Hardware IncludedNo
Mounting Hole Quantity2
Master Cylinder Bore Diameter0.8125
Brake Booster IncludedNo
Master Cylinder Cap IncludedNo
Master Cylinder MaterialCast iron
Push Rod IncludedNo
Reservoir IncludedNo
Bleeder Hoses IncludedNo
Sensor IncludedNo
Mounting Bracket IncludedNo
Number of Outlets2
Package ContentsMaster cylinder
Rearward Outlet SizeM12x1.0
Reservoir TypeRemovable
Secondary Outlet Thread DiameterM12x1.0

This part fits 18 vehicles. Search below:

YearMakeModelSubmodelTransmissionPositionNotes
2015AcuraILXN/A
2015HondaCivicLXAutomaticN/A
2015HondaCivicLXAutomatic CVTN/A
2015HondaCivicEXN/A
2015HondaCivicEX-LN/A
2015HondaCivicSiN/A
2014AcuraILXBaseN/A
2014AcuraILXDynamicN/A
2014HondaCivicLXAutomaticN/A
2014HondaCivicLXAutomatic CVTN/A
2014HondaCivicEXN/A
2014HondaCivicEX-LN/A
2014HondaCivicSiN/A
2013AcuraILXBaseN/A
2013AcuraILXDynamicN/A
2013HondaCivicSiN/A
2012HondaCivicSi HFPN/A
2012HondaCivicSiN/A

* 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:

11-4581130.4007946100TR7A01MC146124MC391462

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