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Old 11-16-2021, 11:47 AM   #51
blkaplan
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Originally Posted by dbarton View Post
It might be a good time to start referring to the "Mustang MC" as a "94-95 Cobra" or "94-95 GT." They're not the same. I see lots of people discussing their use of the GT master, which has a 27 mm bore. This is the one I have issues with. The Cobra MC, however, has a bore of 23.8 mm, which is a more reasonable size. And the Cobra is what Homer refers to is his Porsche big brake thread and other threads.
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Old 11-16-2021, 12:37 PM   #52
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The 94-95 Mustang Cobra master cylinder has a bore size of 15/16 inch. The 94-95 Mustang GT master cylinder has a bore size of 1-1/16 inch. In my opinion 1-1/6 inch is too big, causes hard pedal.
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Old 11-16-2021, 01:13 PM   #53
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I'm using the GT master (Raybestos MC390185) with R calipers on all 4 corners. Brake effort is absolutely fine; pedal pressure is not excessive with no vacuum in the booster, either.
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Old 11-16-2021, 02:03 PM   #54
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Just to clarify, one post i made in my project thread said cobra, an error of mine. The correct MC is in fact the mustang GT version with the 1.0625" (27mm bore)
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Old 11-16-2021, 02:04 PM   #55
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Originally Posted by lummert View Post
The 94-95 Mustang Cobra master cylinder has a bore size of 15/16 inch. The 94-95 Mustang GT master cylinder has a bore size of 1-1/16 inch. In my opinion 1-1/6 inch is too big, causes hard pedal.
I matched this MC to work with the cayenne/touareg/q7 brakes. I would NOT expect it to feel right with other random calipers.
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Old 11-16-2021, 02:36 PM   #56
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FWIW, the P2s use a 25mm bore MC.
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Old 11-16-2021, 09:03 PM   #57
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I've run the 94-95 Mustang GT master cylinder both with the Cayenne brakes and with the R brakes and the pedal effort was fine with both. Both the Cayenne and R rear calipers have the exact same piston sizes and the Cayenne front caliper pistons have ~15% more area than the R calipers so I don't think there should be a drastic difference between the two as far as master cylinder choice goes
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Old 11-17-2021, 12:57 AM   #58
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I also used the Mustang GT master cylinder with the cadillac brakes. Pedal has always been solid.
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Old 11-17-2021, 12:46 PM   #59
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I'm running a 1999 Ford Ranger master on my 88 765 with Jumbo brakes. it has the correctly angled reservoir for horizontal mounting. If I recall the bore is 15/16. This master did require some adapting of the outlet ports.
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Old 11-17-2021, 05:41 PM   #60
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With V70II front calipers, XC90 rear calipers and 336/308 discs the 27mm Mustang master worked great. Now with V70II front calipers, 302mm discs and stock rear brakes I wouldn't mind having a notch smaller master.
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Old 11-17-2021, 08:24 PM   #61
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While we are collecting this info, I will throw this out there. I read somewhere on here that you can put the Volvo reservoir on the Mustang master cylinder. While this is technically true, the Volvo has longer "nipples" on the bottom. I tried to o-ring it to space it up but no matter what I did, it would leak while bench bleeding it. Perhaps if you can hulk out on it and get 3 o rings in there it won't leak, but I couldn't get that many in there.
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Old 11-18-2021, 02:16 AM   #62
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Quote:
Originally Posted by 2turbotoys View Post
While we are collecting this info, I will throw this out there. I read somewhere on here that you can put the Volvo reservoir on the Mustang master cylinder. While this is technically true, the Volvo has longer "nipples" on the bottom. I tried to o-ring it to space it up but no matter what I did, it would leak while bench bleeding it. Perhaps if you can hulk out on it and get 3 o rings in there it won't leak, but I couldn't get that many in there.
I used the Volvo reservoir on one of my cars and I got it to seal by cutting the top flat ring part off the Volvo master cylinder seal and putting them onto the reservoir before putting the reservoir on the master cylinder. I ziptied the reservoir down to the master cylinder and it held 20+ psi twice while bleeding and it's been working for a year now with no leaks.
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Old 11-21-2021, 09:13 PM   #63
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Interesting. Good tip, maybe a stainless flexible zip tie would take a little of the TB out of that fix.
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Old 11-24-2021, 06:46 PM   #64
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How about a Ford Ranger or F-series reservoir on a Mustang mater cylinder?
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Old 11-24-2021, 08:11 PM   #65
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Do they fit?
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Old 11-25-2021, 06:07 AM   #66
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Quote:
Originally Posted by 2turbotoys View Post
Interesting. Good tip, maybe a stainless flexible zip tie would take a little of the TB out of that fix.
The zip tie was mostly to prevent the reservoir from blowing off while bleeding. It didn't leak when I initially filled it and I just saw no reason to take the zip tie off after I was done.
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Old 11-25-2021, 06:46 PM   #67
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Quote:
Originally Posted by rijk View Post
Executed the R brakes conversion (f+r) on my 1993 960 (B234FT). Also use the CENTRIC 13061062 Master Cylinder for a 1994 Mustang. Excellent brake performance, far beyond stock. The only thing still missing is the Brake Fluid Level Sensor Connector. Need to hook up the sensor to the dash warning light in the unlikely event brake fluid level gets critical. Can anybody tell me where I can purchase that sensor connector?

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You can buy a pigtail from various places; "Duralast 870" will get you some, e.g.

https://www.autozone.com/electrical-...-870/87849_0_0
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Old 11-25-2021, 06:53 PM   #68
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Just some anecdata; we have been running for a couple years now with the 240 reservoir in Cobra master with O-ring spacers trick. This setup leaks over time in a racing setup, and crud gets past the o-rings and down into the master inlets, forcing a regular strip / clean / rebuild cycle.

The Ranger reservoir does not clear Ben's strut bar, so not an option. There's very little clearance under the hood for remote reservoirs or I'd have gone that route already...
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Old 11-25-2021, 08:29 PM   #69
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I skipped it altogether and went to hydroboost.
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Old Yesterday, 02:58 PM   #70
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Quote:
Originally Posted by DrZiplok View Post
Just some anecdata; we have been running for a couple years now with the 240 reservoir in Cobra master with O-ring spacers trick. This setup leaks over time in a racing setup, and crud gets past the o-rings and down into the master inlets, forcing a regular strip / clean / rebuild cycle.

The Ranger reservoir does not clear Ben's strut bar, so not an option. There's very little clearance under the hood for remote reservoirs or I'd have gone that route already...
(twofast242gt) Bryan Havinga rigged up some remote reservoirs on his MC to clear. I think there are pics on his build thread.
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