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JEGS 631390

JEGS Black Aluminum Master Cylinder GM Universal Mounting


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JEGS Chrome Aluminum Master Cylinder GM Universal Mounting
JEGS 555-631392

JEGS Black Aluminum Master Cylinder GM Universal Mounting $131.09
Out of stock
Black Aluminum Master Cylinder
  • GM Universal Mounting
  • 1 in. Bore
  • (1) 9/16 in.-18 & (1) 1/2 in.-20 Port on Driver's Side
  • Non-Power Assisted Disc/Drum Applications
  • Power Assisted Drum/Drum, Disc/Drum & Disc/Disc Applications
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    JEGS 631390 Details

    Cast Aluminum Master Cylinders

    This dual reservoir master cylinder is machined from cast, aircraft quality, aluminum into a smooth and stylish unit.


    • Aluminum Powder Coated Black Master Cylinder
    • Dual Bail & 1 in. Bore
    • 8.250 in. L x 4.250 in. W
    • Screw Top Lid w/ Hex Screws
    • Manual Master Firewall Boot Included
    • Manual Master Adapter Included
    • Works for Power or Manual Applications
    • 3 3/8 in. Center to Center Mounting Holes for a Truly Universal Application


    Reservoir Included
    Master Cylinder Cap Included
    Master Cylinder Material
    Brake Booster Included
    Pushrod Included
    Mounting Hole Quantity
    2 holes
    Sold individually
    Reservoir Material
    Master Cylinder Bore Size (in.)
    Master Cylinder Finish
    Bowl Design
    Hardware Included
    Mounting Brackets Included
    Remote Reservoir
    Front Brake Type
    Various - Application Specific
    Master Cylinder Stroke (in.)
    Mounting Flange Center to Center Distance (in.)
    Manufacturer's Part Number:
    Shipping Weight:
    Package Height:
    Package Depth:
    Package Width:

    Cast Aluminum Master Cylinders
    JEGS cast aluminum master cylinders feature either a high luster chrome or a durable black powder coat finish with GM universal mounting.

    Power Brake Boosters
    JEGS power brake boosters feature either a durable black powder coat or chrome finish and are available in combinations for every application. A pedal rod extension kit and a brake booster bracket are recommended (sold separately) when converting from manual to power brakes.

    Master Cylinder and Booster Kits
    JEGS 1 1/8 in. master cylinder and power brake booster kits feature a high luster chrome or black powder coat finish and are available in a variety of combinations for every application.

    Brake Booster Brackets
    JEGS polished stainless steel or durable black powder coat brake booster brackets are designed to convert the firewall stud mounting pattern from a manual master cylinder to the power brake booster pattern.

    631390 is rated 3.3 out of 5 by 3.
    Rated 5 out of 5 by from Perfect look Needed to upgrade to power brakes to stop the race car. Jegs master cyl was just the right look.
    Date published: 2016-10-05
    Rated 3 out of 5 by from big brake master cylinder I have not bleed this product yet so I cannot give it a complete review. But I will say that the powder coating is not show quality, it has runs in the lid and the finish is very rough. Yes the price is reasonable but not for the show person.
    Date published: 2017-09-30
    Rated 2 out of 5 by from Poor black finish Pay the extra for a chrome one. Brake fluid takes off the black coating.
    Date published: 2019-05-21
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    Easy Kits

    Some parts are not legal for use in California or other states with similar laws / regulations

    Motor Vehicles

    WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.


    WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.

    Electrical Cords

    WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.