JEGS
Universal Master Cylinder 1-1/8 in. Bore
555-631406
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JEGS 555-631406 Universal Master Cylinder Features:
- Constructed from aluminum for the master cylinder and composite dual reservoir with boot
- Features extra, through body holes, for side mounting
- Specifications: 1.125 in. piston for 2-piston front & 4-piston rear disc up to 4-piston front & 4-piston rear disc system
- Dimensions: 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", and spacing from front to centerline of first inlet fitting: 1"
- Includes (2) 1/2"-20 ifm to 3/8"-24 iff fittings, (1) boot, and (1) 3/8"-24 rod
- 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"
- Dimensions:
3/8"-24 Threads
Specifications:
Part Type
Product Line
Bowl Design
Dual
Brake Booster Included
No
Front Brake Type
Various - Application Specific
Hardware Included
Yes
Master Cylinder Bore Size
1.125 in (28.575 mm)
Master Cylinder Cap Included
Yes
Master Cylinder Finish
Natural
Master Cylinder Material
Aluminum
Master Cylinder Stroke
1.35 in (34.29 mm)
Mounting Brackets Included
Yes
Mounting Flange Center to Center Distance (in.)
N/A
Mounting Hole Quantity
2 holes
Package Depth
5.50
Package Height
10.60
Package Width
10.10
Part Category
Replacement Parts
Part Fitment
Semi Universal
Pushrod Included
No
Quantity
Sold individually
Remote Reservoir
No
Reservoir Included
Yes
Reservoir Material
Composite
Shipping Weight
2.95
631406 is rated
out of
5 by
9.
Rated 5 out of
5
by
Carl78 from
Great product !!!!!!!
This Is the second of these I’ve purchased and have been very pleased with them.
Date published: 2020-02-29
Rated 5 out of
5
by
TangoIndiaMike from
Love the side mounting.
I've been running this master on my 50 Pontiac as a daily driver for the past 5 years. Still going strong so I decided to upgrade the 49 as well. Installs in many configurations and is much safe than a single piston master.
Date published: 2019-03-05
Rated 5 out of
5
by
MarkyMark1969 from
Light weight and clean
Great kit. Very light and cleans up engine bay nicely
Date published: 2015-11-21
Rated 3 out of
5
by
i dont have one from
not installed yet auto review keeps buggin me
auto review is buggin me fer a review
I'm on vacation & not to chippy bout recievin emails every day regarding this matter
Date published: 2023-05-22
will this work on my 86 ElCamino with vacuum Booster
The Jegs 555-631406 master is universal fit, modifications may be necessary for fitment.
Date published: 2023-09-14
will this work on a 67 cuda?
The Jegs 555-631406 master cylinder is universal fit, modifications may be necessary for fitment.
Date published: 2023-07-24
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.
The standard line lock kit will sell is made for the front brakes and will not be affected by the rear disc kit.
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?
This will provide more braking power than your original brakes and should be used in a disc/disc setup.
Date published: 2020-12-09
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.
This rod will pivot in the master cylinder. We do not have this with a long pushrod.
Date published: 2020-12-09
Does master cylinder 555-631406 require a booster and what type of racing pedal will fit it?
These do not require a booster, they are designed for manul race car brake system. Most pedals can be connected to this master cylinder.
Date published: 2018-06-15
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?
It is universal, so as long as it fits your application than it should work for your application.
Date published: 2018-06-15
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Some parts are not legal for use in California or other states with similar laws / regulations
Motor Vehicles
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Electrical Cords
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