HomeBrake > Brake HydraulicsDorman M630018 Brake Master Cylinder
Part #: M630018

Dorman M630018 Brake Master Cylinder

⚙️ 2 vehicles fit this part
🔍
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$106.09Free 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.
🔥
✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Kia, Rio
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

Reliable Brake Master Cylinder for Kia Rio

The Dorman M630018 brake master cylinder is designed specifically for Kia Rio models, providing precise hydraulic control for your vehicle's braking system. This aluminum master cylinder includes a reservoir and sensor to ensure optimal performance and safety.

Key Features of Dorman M630018 Brake Master Cylinder

  • Master cylinder bore diameter: 0.875 inches for accurate hydraulic pressure
  • Constructed from durable aluminum material for corrosion resistance
  • Includes reservoir for brake fluid storage
  • Equipped with a sensor to monitor brake system status
  • Two outlets with rearward outlet size M10 x 1.0 and secondary outlet thread diameter 10 mm
  • Thread pitch of 1.0 for secure fitting

Detailed Product Description

The Dorman M630018 brake master cylinder is engineered to meet the specific hydraulic requirements of Kia Rio vehicles. Its aluminum construction offers strength and resistance to wear, while the included reservoir ensures consistent brake fluid supply. The integrated sensor provides real-time feedback to the vehicle’s braking system, enhancing safety and reliability. With two outlets and precise thread specifications, this master cylinder facilitates proper brake line connections, maintaining effective brake hydraulics.

Common Issues Addressed by This Brake Master Cylinder

  • Brake pedal feels spongy or soft due to master cylinder failure
  • Brake fluid leaks from the master cylinder or reservoir
  • Warning lights triggered by faulty brake fluid level sensor
  • Reduced braking efficiency caused by internal seal wear
  • Inconsistent brake pressure affecting vehicle stopping power

Installation Notes and Tips

  • Compatible with Kia Rio models; verify vehicle year and specifications before installation
  • Ensure brake fluid reservoir is properly filled and free of air after installation
  • Use correct thread pitch (1.0) and outlet sizes (M10 x 1.0) for brake line connections
  • Bleed the brake system thoroughly to remove air pockets
  • Sensor connection must be securely attached to maintain brake system monitoring

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to long-lasting performance. While specific warranty details are not provided, Dorman products typically come with a limited warranty covering defects in materials and workmanship.

BrandDorman
Part NumberM630018
Mounting Hardware IncludedNo
Master Cylinder Bore Diameter0.875
Master Cylinder MaterialAluminum
Reservoir IncludedYes
Secondary Outlet Thread Diameter10
Sensor IncludedYes
Number of Outlets2
Package ContentsMaster cylinder
Rearward Outlet SizeM10 x 1.0
Thread Pitch1.0

This part fits 2 vehicles. Search below:

YearMakeModelPositionNotes
2002KiaRioN/AFits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder.
2001KiaRioN/AFits drum brake wheel cylinders requiring 7/8" bore size brake master cylinder.

* 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:

0K30A43400B11-267613-2676130.5001513946F140707M55202MC390212MC511300

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