My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

Dorman M390178 Brake Master Cylinder - 100% New OE Replacement

(1992-1996 Oldsmobile Silhouette; 1992-1996 Chevrolet Lumina APV; 1992-1996 Pontiac Trans Sport)

Part of: Dorman Brake Master Cylinder Replacement

Other options in this family: Dorman M39298 Dorman M19012 Dorman M390139 Dorman M630735 Dorman M390200

Manufacturer

Picture for manufacturer Dorman

Part Number

M390178
10 reviews
Sale Price

$135.14

In Stock (5)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Dorman M390178 is a brand-new, direct-fit replacement brake master cylinder engineered to restore proper hydraulic braking performance. Unlike remanufactured units, this master cylinder is built entirely from new components for consistent, reliable operation right out of the box.

Key Features:

  • Precise OE Replacement: Cylinder housing is constructed to match the casting material of the original part for proper fit and similar performance
  • EPDM Rubber Components: All internal rubber seals and components use high-quality EPDM compound, providing superior resistance to glycol-based DOT brake fluids
  • 100% New Construction: Made entirely of new materials — not remanufactured — ensuring the highest levels of quality and safety
  • SAE-Compliant: Manufactured to meet rigorous SAE International standards for hydraulic brake system components
  • Dorman First Stop Line: Part of Dorman's dedicated brake replacement program, offering broad application coverage for passenger cars and light trucks

The Dorman M390178 brake master cylinder is the trusted choice for DIY mechanics and professional technicians looking for a dependable, new-condition replacement that installs with OE-level precision.

Products specifications

Fits

1992-1996 Oldsmobile Silhouette; 1992-1996 Chevrolet Lumina APV; 1992-1996 Pontiac Trans Sport

Feature - Benefit 1

Cylinder housing is constructed from high-quality cast iron or aluminum for long-lasting durability

Feature - Benefit 2

All rubber components are of high-quality EPDM compound for resistance to glycol-based brake fluid

Feature - Benefit 3

Direct replacement for a proper fit

Feature - Benefit 4

Manufactured to strict engineering quality standards, each Brake Master Cylinder meets S.A.E. specifications

Master Cylinder Material

Aluminum

Secondary Outlet Thread Diameter

10

Number of Outlets

2

Master Cylinder Bore Diameter

24

Rearward Outlet Size

M10 X 1.0

Mounting Hardware Included

No

Reservoir Included

Yes

Thread Pitch

1.0

Package Contents

Master Cylinder

Sensor Included

Yes

A+shipping was quick, communications were quick

I want to let you know that I am extremely satisfied with my recent purchase from Autoplicity. The website was so easy to navigate, I found exactly what I needed and above all I received the product in three days! <br><br>Absolutely AWESOME!!! <br>Without doubt, I will be a repeat customer!!!!!<br><br>THANK YOU!!1

Easy navigation and simple to find my parts.. Second time I've ordered from you guys and it's been great so far

Great prices and quick shipping! I will be back!!

I found my part easily (vent visors), checkout was simple, and I was notified the very next day that my item has been sent. The price (including shipping) was way lower than anywhere else online or in town.

Fast shipping, good customer service!

The item was what i was looking for and the price was right. Item was very good quality. Would order from Autoplicity again.

Great price on my short ram air intake... Actually, best I could find on the Internet. Product shipped the day after the order. Haven't had any problems so far, but it was only shipped just today.

Great prices and fast shipping. It doesn't get any better

Excellent price and received the product the next day.

Share icon
Return Policy
Returns are easy at Autoplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy