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JEGS Universal Master Cylinder 1-1/8" Bore

JEGS 631406


JEGS Universal Master Cylinder 1-1/8" Bore $77.99
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Aerospace Components Aluminum Master Cylinder 1 1/8 Bore Size
Aerospace Components 026-AC-MC-01
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Universal Master Cylinder
  • 1-1/8" Bore
  • Aluminum body
  • Composite Dual Reservoir
  • Holes Provided for Fabricating Side Mount
  • 1/2"-20 Ports
  • (2) 1/2"-20 IFM to 3/8"-24 IFF Fittings
  • (1) Boot
  • (1) 3/8"-24 Rod

  • JEGS 631406 Details

    Master Cylinder with Adapter Fittings Only

    • Mounting holes are 5/16" and are on 3-3/16" (3.188) centers.
    • Overall Length: 8.25"
    • Overall Width: 3.5"
    • Height from base to top of reservoir: 4.5"
    • Spacing between inlet fittings 3.0"
    • Length of plastic reservoir 6.5"
    • Spacing from front to centerline of first inlet fitting: 1"

    3/8"-24 Threads


    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.)
    Shipping Weight:
    Package Height:
    Package Width:
    Package Depth:
    Manufacturer's Part Number:

    JEGS Universal Master Cylinder and Master Cylinder Kits are available with two piston sizes for virtually any combination of drag racing, late model stock car, off-road or street rod braking system. Master cylinders feature aluminum body/composite dual reservoir with boot and 3/8"-24 rod in either a 1.031" piston (for drum/drum up to 2-piston front and 4-piston rear disc) or a 1.125" piston (for 2-piston front and 4-piston rear disc up to 4-piston front and 4-piston rear disc) systems. Each master cylinder also features extra, through body holes, for side mounting. Available either as a master cylinder with 1/2"-20 male x -3AN inverted flare female brake line adapter fittings only or in kit form with a universal billet mounting bracket/spacer, master cylinder, brake line adapter fittings and mounting hardware.

    631406 is rated 4.7 out of 5 by 3.
    Rated 5 out of 5 by from Light weight and clean Great kit. Very light and cleans up engine bay nicely
    Date published: 2015-11-21
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    • clientName_jegs

    Thanks for the advice. I ordered your rear disc conversion and it arrived a few days ago. Will my old linelock system work without interfering with the master cylinder, or would you advise to get a more modern one, or not to use one at all.

    Asked by: Phil H
    The standard line lock kit will sell is made for the front brakes and will not be affected by the rear disc kit.
    Answered by: Rusty B
    Date published: 2018-06-15

    Have a 1967 Mustang I'm converting to disc brakes. Maybe 4 wheel-not sure. B4 once the drums got a little glazed at126 mph thru the traps meant funny car turnaround. Will this work for 2/4wheel conversion and make a better stop w/out Gorilla leg?

    Asked by: Phil H
    This will provide more braking power than your original brakes and should be used in a disc/disc setup.
    Answered by: Rusty B
    Date published: 2018-06-11

    Does rod pivot where it engages the master cylinder, or is it screwed in solid to the master cylinder? I need a rod that pivots for a 63 Lemans. And, can I get the rod in a longer length (say 6")? I can extend the rod, but I need the pivot.

    Asked by: Thud
    This rod will pivot in the master cylinder. We do not have this with a long pushrod.
    Answered by: Rusty B
    Date published: 2018-06-05

    Does master cylinder 555-631406 require a booster and what type of racing pedal will fit it?

    Asked by: stephen15
    These do not require a booster, they are designed for manul race car brake system. Most pedals can be connected to this master cylinder.
    Answered by: Rusty B
    Date published: 2018-03-17

    I have a 83 Monte ss that needs just master cylinder and rod that this universal kit comes with can i use this kit for it? It's is a drag car I'm not using a brake booster just master and push rod is all I need can use this universal kit?

    Asked by: Monte83ss
    It is universal, so as long as it fits your application than it should work for your application.
    Answered by: Rusty B
    Date published: 2017-11-02
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    Some parts are not legal for use in California or other states with similar laws / regulations