Track OrderOrder Status & ReturnsHelpGift CardsHelpHelp CenterPhone1-800-345-4545
Shop by Category

Most Popular

Restoration

Shop All Categories

Shop New ProductsShop ALL BrandsTech ArticlesDeals
MY ACCOUNT
Order Status & Returns
CONTACT USHELP CENTER
Logo
Cart0
$000
Brake Master Cylinder with Dual Reservoir, Aluminum with Black Finish [Universal Mounting]
InfoVehicle Info Needed
JEGSPART NUMBER: 555-631390

Brake Master Cylinder with Dual Reservoir, Aluminum with Black Finish [Universal Mounting]

$15499$170.99You Save$16.00
9 left in stock
ShippingShips on Oct 19, 2026
Lowest PriceLowest Price Guarantee

Universal Cast Aluminum Brake Master Cylinders
Brake Master Cylinder
  • Universal Mounting
  • Non-Power Disc/Drum Applications
  • Power Assisted Drum/Drum, Disc/Drum & Disc/Disc Applications
  • Oval Body with Dual Reservoir
  • 1 in. Bore
  • Aluminum
  • Black Powder-Coat Finish

    JEGS 631390 dual reservoir brake master cylinder is machined from cast aircraft-quality aluminum and black powder-coated into a smooth and stylish unit.

    Features:

    • Screw Top Lid w/ Hex Screws
    • Manual Master Firewall Boot Included
    • Manual Master Adapter Included
    • Works for Power or Manual Applications
    • 8.250 in. L x 4.250 in. W
    • 3 3/8 in. Center to Center Mounting Holes for a Truly Universal Application
    • (1) 9/16 in.-18 & (1) 1/2 in.-20 Ports on Driver's Side

      • Direct-Fit & Universal Brake Master Cylinders

      JEGS offers a wide variety of brake master cylinders for direct fit or universal applications. Whether you're looking for a chrome unit to make your engine bay shine or just a replacement to get your vehicle back on the road, we have you covered. All units are manufactured using NEW not remanufactured high-quality materials and finishes to provide years of braking service.

    Part TypeMaster Cylinder
    Product LineJEGS Brake Master Cylinders
    BrandJEGS
    Package Height5.1
    Package Width5.3
    Package Length10.5
    Weight4.76 PG
    Part CategoryReplacement Parts
    Master Cylinder StrokeN/A
    Hardware IncludedNo
    Remote ReservoirNo
    Master Cylinder FinishBlack
    Installation Hardware IncludedNo
    Brake Booster IncludedNo
    Master Cylinder Bore Size1 in (25.4 mm)
    Bleeder Hoses IncludedYes
    Forward Outlet Size1/2-20 IF (Inverted Flare)
    Mounting Brackets IncludedNo
    Brake SystemManual or Power
    Master Cylinder MaterialAluminum
    Master Cylinder Cap IncludedYes
    Front Brake TypeDisc or Drum
    Part FitmentSemi Universal
    Rearward Outlet Size9/16-18 IF (Inverted Flare)
    Vendor Part Number260-8555-BK-MBM
    Package Qty1
    Package TypeEA
    No Questions
    No Reviews

    Items You Need

    AN to Inverted Flare Male Master Cylinder Fitting [-3 AN x 1/2 in.-20]

    JEGS

    AN to Inverted Flare Male Master Cylinder Fitting [-3 AN x 1/2 in.-20]

    Part Number : 555-100773
    $919$9.99
    You Save$0.80
    AN to Inverted Flare Male Master Cylinder Fitting [-3 AN x 9/16 in.-18]

    JEGS

    AN to Inverted Flare Male Master Cylinder Fitting [-3 AN x 9/16 in.-18]

    Part Number : 555-100774
    $919$9.99
    You Save$0.80
    Heavy-Duty Nitrile Gloves [7 mils Thick, X-Large]

    JEGS

    Heavy-Duty Nitrile Gloves [7 mils Thick, X-Large]

    Part Number : 555-1125
    $1999$21.99
    You Save$2.00
    Inverted Flare Reducer Adapter 1/2 in.-20 Inverted Flare Male to 3/8 in.-24 Inverted Flare Female

    JEGS

    Inverted Flare Reducer Adapter 1/2 in.-20 Inverted Flare Male to 3/8 in.-24 Inverted Flare Female

    Part Number : 555-63084
    $414$5.99
    You Save$1.85
    Brake Bleeder Wrench 1/4" & 3/8"

    JEGS

    Brake Bleeder Wrench 1/4" & 3/8"

    Part Number : 555-80660
    $1099$11.99
    You Save$1.00
    Brake Bleeder Wrench 5/16" & 3/8"

    JEGS

    Brake Bleeder Wrench 5/16" & 3/8"

    Part Number : 555-80661
    $999$10.99
    You Save$1.00
    Brake Fluid Tester

    JEGS

    Brake Fluid Tester

    Part Number : 555-80665
    $2389$25.99
    You Save$2.10
    Brake Bleeder and Vacuum Pump Kit

    JEGS

    Brake Bleeder and Vacuum Pump Kit

    Part Number : 555-80668
    $3799$41.99
    You Save$4.00
    Brake Bleeder Kit with Magnet

    JEGS

    Brake Bleeder Kit with Magnet

    Part Number : 555-W80625
    $899$9.99
    You Save$1.00
    Brake Bleeder Kit

    JEGS

    Brake Bleeder Kit

    Part Number : 555-W80626
    $799$8.99
    You Save$1.00
    Non-Chlorinated Brake & Parts Cleaner 14.5oz Aerosol

    PERMATEX

    Non-Chlorinated Brake & Parts Cleaner 14.5oz Aerosol

    Part Number : 775-82220
    $1199

    ITEM YOU MAY ALSO CONSIDER

    Brake Master Cylinder with Dual Reservoir, Aluminum with Chrome Finish [Universal Mounting]

    JEGS

    Brake Master Cylinder with Dual Reservoir, Aluminum with Chrome Finish [Universal Mounting]

    Part Number : 555-631392
    $14399$158.99
    You Save$15.00
    Master Cylinder Universal Black

    TUFF STUFF

    Master Cylinder Universal Black

    Part Number : 908-2018NC
    $11250
    Master Cylinder Universal Black

    TUFF STUFF

    Master Cylinder Universal Black

    Part Number : 908-2019NC
    $11716
    Brake Master Cylinder Kit with Adjustable Proportioning Valve [Universal Mounting]

    JEGS

    Brake Master Cylinder Kit with Adjustable Proportioning Valve [Universal Mounting]

    Part Number : 555-631390K1
    $26098
    Brake Master Cylinder Kit with Adjustable Proportioning Valve and Mounting Hardware [Universal Mounting]

    JEGS

    Brake Master Cylinder Kit with Adjustable Proportioning Valve and Mounting Hardware [Universal Mounting]

    Part Number : 555-631390K2
    $28498

    EASY KITS

    Master Cylinder Install Kit for GM [1 in. Bore, Black]

    JEGS

    Master Cylinder Install Kit for GM [1 in. Bore, Black]

    Part Number : 555-631390K
    $26396
    Brake Master Cylinder Kit with Adjustable Proportioning Valve [Universal Mounting]

    JEGS

    Brake Master Cylinder Kit with Adjustable Proportioning Valve [Universal Mounting]

    Part Number : 555-631390K1
    $26098
    Some parts are not legal for use in California or other states with similar laws / regulations
    p65 warning
    Your Cart

    Your shopping cart is empty!