Dual Bowl Master Cylinder For Manual Disc/Disc or Disc/Drum Brakes 1965-1973

Master Power: MC11378M
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Dual Bowl Master Cylinder For Manual Disc/Disc or Disc/Drum Brakes 1965-1973
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Product Description

Dual bowl brake master cylinder for 1965-1973 Mustangs with non-power disc/disc or disc/drum brakes.

The single master cylinder that the 1965-1966 Mustang is originally equipped with provides fluid pressure to all four wheels at the same time. All four wheels are linked together in a hydraulic fluid circuit. If a problem develops in any of the four brakes, lines, hoses or single master cylinder, that creates a fluid pressure loss. This will cause you to lose both front and rear brakes.

With a dual master cylinder, the brakes are split front and rear. If a problem develops in the front, only the front brakes would be lost. You would still have the rear brakes to bring you to a stop. The same would happen if you had a problem with the rear brakes, you would still have the front brakes to bring you to a stop.

This master cylinder has a 1" bore and will fit disc/drum and disc/disc applications. The front outlet is 3/8"-24 and the rear outlet is 1/2"-20.

Dual bowl conversion lines are required for installation on a 1965-1966 Mustang.

Similar Mustang Parts

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Installation Instructions

Mustang Installation

Mustang Applications

This product will fit the following Ford Mustang years:

Product Reviews

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Dual Bowl Master Cylinder For Manual Disc/Disc or Disc/Drum Brakes 1965-1973 is rated 3.3333 out of 5 by 3.
Rated 4 out of 5 by from Easy Install, Needs parts to complete Wasn't exactly a one fore one swap. First of all but no big deal, a stock brake pushrod is loose in the piston unlike the original master which you have to pop the pushrod out. No big deal because the brake pedal holds it in. More important is if you are using your stock lines to the distribution block you will need adapters readily available at summit or jegs. The front fitting needs to be stepped up one size and the back needed to be stepped up twice. You are looking for male to female inverted flare adapters. Or you could make new lines but I did not have the material or tools at the time.
Date published: 2015-05-11
Rated 3 out of 5 by from MC is fine, however lines are an issue I installed this MC and it fit just fine. A few things to note: The colored caps in the picture were not included with my MC. The brake lines MU14190O do not fit this MC. The rear bowl line to the dist block is too small, need an adapter. The front bowl nut (mine was black) is too small. It screws in, but does keep pressure. Good Luck! DL
Date published: 2015-08-17
Rated 3 out of 5 by from Good fit, but felt deceived. Fits as advertised. It wound be nice if it came with adapter fittings. It was not listed that this is a MP brand master cylinder. Felt deceived becouse I was also looking at the lower priced MP product to purchase.
Date published: 2015-07-29
  • 2015-10-09T09:51CST
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Product Questions


Will this master cyclender require a proportioning valve. Thank you 

Asked by: mred
the master cylinder does not dictate that, your brake system does, i.e. four wheel disc requires a proportioning valve
Answered by: unlikemike69
Date published: 2015-09-21


Asked by: MIBLDGS
possibly, the bore of the m/c dictates how much fluid is pushed to the wheel cyls/calipers, the larger the bore the less travel of the pedal more force is required, the smaller bore travels further but requires less force, which is what i did, (7/8") but the pedal is also softer, this m/c is 1"bore and that is the correct size, wish i would have stayed with 1" bore
Answered by: unlikemike69
Date published: 2015-08-15

I have a 65 ford mustang v8 with disc brake front-drum rear. I cant find a place on it anywhere to show the full mark on it. can you help me out. It is a single bowl for disc front brake type. Thanks in advance - Doug Styers -CJP customer.

Asked by: Doug65
there are no "full marks" on the older cars just fill it so that it does not overflow when replacing cap.
Answered by: unlikemike69
Date published: 2015-08-15

Hi. I have a 1966 GT with disc/drum. It appears to have an m/cyl and booster kit fitted. What m/cyl and pushrod do i replace the m/cyl with? I ask this because the brake pedal sits about 1/2in higher than the throttle pedal. 

Asked by: swoop02
Do you mean that it is a power brake booster kit? if so then the rod stays in the booster and brake pedals should be higher than gas pedals
Answered by: unlikemike69
Date published: 2015-08-15

Hi Would this be compatible with a 1964 falcon futura/sprint?

Asked by: Iceroad
Unsure. We only test fitment for the models listed, so anything outside of that is untested, meaning we have no clue if it will or won't work.
Answered by: CJ Pony Parts
Date published: 2015-03-02
  • 2015-10-09T10:14CST
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