Rear Disc Conversion (What Master Cylinder?)

Man, you should go to autozone and get the new duralast ceramic roof friction material, its awesome !

Seriously the, you MIGHT be draggin a little bit but it provably isn't really a dig deal. Still, I'd take it out if you don't need it.[/QUOTE]



I loved that little escort gt but I showed it no mercy. After totaling it twice, only once was my fault(damn deer, shoulda killed it instead of swerving), common sence told me not to rebuild it again.

Thanks for the tip I'll pull that thing outa' there when I get a chance.

torino420 said:

Thanks for that, anyone have any pics of this installed? From the pics of the MC I've seen it looks tilted, I'm curious how that looks installed.
I want to install one without a booster.

thanks again.

Click to expand...

I dont have a pic yet. The mc is straight out from the firewall. It's the top of the resevour that's tilted. The bottom is flat and is straight with the mc.

Jimmys66 said:

I dont have a pic yet. The mc is straight out from the firewall. It's the top of the resevour that's tilted. The bottom is flat and is straight with the mc.

Click to expand...

I'm just curious how it looks, if the reseviour is tilted it wont look right let alone function properly?

Or does the way it mount to the firewall make the reseviour more level?

Jimmys66 said:

I dont have a pic yet. The mc is straight out from the firewall. It's the top of the resevour that's tilted. The bottom is flat and is straight with the mc.

Click to expand...

The '94-'04 SN-95 Mustang V6 MC would be a better choice over the GT MC. The V6 MC's reservoir sits level, unlike the GT's MC, which would run at a downward angle when mounted to the firewall or brake booster in an early Mustang.

Picture of how much upward angle you'd have to have on he GT MC to make the reservoir sit level; (the reservoir is not "plugged into the MC", but you get the idea from the photo what it would look like). http://img514.imageshack.us/img514/1395/sn95mastercylinder007ty7.jpg

If you installed the GT MC on the firewall or brake booster, it would look like this: (this would cause the fluid to run to the front, which would starve the rear port (primary side) for brake fluid). http://img402.imageshack.us/img402/6833/sn95mastercylinder008fa2.jpg


This is an SN-95 V6 MC I installed 3 years ago on a 2.3L Fox brake booster, in a '65 fastback, with K/H front discs and SN-95 V6/GT rear discs: http://img402.imageshack.us/img402/6563/kieths65053cf5.jpg

Exactly what i was thinking. What is the smallest bore the SN95 MC comes in though as I'm going with a manual 4 wheel disk setup. I'd like to keep it under an inch.

I've also heard of the rangers having a 15/16" bore from 86-89 iirc but not sure if that will work with rear disks.

thanks again.

torino420 said:

Exactly what i was thinking. What is the smallest bore the SN95 MC comes in though as I'm going with a manual 4 wheel disk setup. I'd like to keep it under an inch.

I've also heard of the rangers having a 15/16" bore from 86-89 iirc but not sure if that will work with rear disks.

thanks again.

Click to expand...

Rangers had drums brakes in rear, so the Ranger MC would be designed for discs front/drums rear. This would not be coampatible with rear discs.

The '94-'98 V6 SN-95 4-wheel disc MCs had a 1-1/16" bore. The '99-2004 V6 MCs had a 1" bore.

'99 was the division between the SN-95 V6 Mustangs going from front discs that had a single large caliper piston to two caliper pistons (same brakes that came on the '99-up Mustang GTs).


http://www.ultrastang.com

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It appears that using a booster changes the angle, but when directly on the firewall that thing will be tilted quite a bit.

66Runt said:

As you can see in this picture, the Cobra master cylinder is almost level.

http://www.musclemustangfastfords.c...93_ford_svt_cobra_wheels_brakes/photo_09.html

Also if you look at a stock MC from a GT you will notice the the rear of the master cylinder is elevated, raising the rear floor of the reservior. While it may not "look" correct to some, it is functional.

Click to expand...

You also have to take into consideration that the photo shows the MC mounted on a Cobra vacuum booster (different from a regular 2.3L or 5.0L Fox brake booster), which is shown mounted in a Fox Cobra Mustang.

If you take that Fox Cobra MC and mount it directly to the firewall of an early Mustang, or if you mount it to a stock, early, vacuum booster (or mount it on a Fox brake booster installed in an early Mustang), the downward angle of the MC's reservoir becomes more severe.

You cannot buy the SN-95 V6 master cylinder reservoirs new from Ford, but if you were to take a V6 MC reservoir from a wrecking yard donor, then you could put it on the '93-'95 Cobra MC and have a reservoir that mounts horizontally to the MC. This would disburse the fluid evenly within the reservoir.

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Take a weekend off and this is what I get.

Mine was from a 96 cobra but, I think they were all the same(94-04), hydroboost or not. Ultrastang will have to verify that one.

My MC is a 15/16" bore and it works great. Same pedal pressure as my drum setup. Not to soft, not to hard, just right.

At first I was a little put off by the angle but, a mech. friend and I came to the same conclusion as Runt did. If the front of the res is filled to the top because of the angle it leaves nowhere for the fluid to move to under hard braking.

Anyone got a pic of the mc from a baer brakes setup? I'd be curious to see if they changed the res.

Jimmys66 said:

Take a weekend off and this is what I get.

Mine was from a 96 cobra but, I think they were all the same(94-04), hydroboost or not. Ultrastang will have to verify that one.

My MC is a 15/16" bore and it works great. Same pedal pressure as my drum setup. Not to soft, not to hard, just right.

At first I was a little put off by the angle but, a mech. friend and I came to the same conclusion as Runt did. If the front of the res is filled to the top because of the angle it leaves nowhere for the fluid to move to under hard braking.

Anyone got a pic of the mc from a baer brakes setup? I'd be curious to see if they changed the res.

Click to expand...

The 1993 Cobra R was the first to use the large 13" front rotors, 11.65" rear rotors and the large vacuum brake booster that was found on the '94/'04 SN-95 Cobras. (Pictured in following link; 1993 Cobra R engine compartment. --notice large vacuum booster --Same one found in the '94/'95 Cobras). http://img525.imageshack.us/img525/7872/1993cobrarhn0.jpg

1993 Fox Cobra R, '94/'95 SN-95 Cobra vacuum booster on left compared to '87-'93 Fox 5.0L vacuum booster on right; http://img254.imageshack.us/img254/5310/cobravs50lbrakeboosterdb7.png

In 1996, the SN-95 Mustang GTs and Cobras were no longer available with vacuum boosters. They were switched over to hydroboosted brakes. --I'm not sure if the '96-later V6 Mustangs continued to use vacuum boosters.

The '94/'95 Cobra MCs had horizontal mounting flange patterns. Once the brakes were changed to hydroboost setups in '96, the MC mounting flanges changed to a vertical mounting flange pattern. The '96-'04 hydroboost MCs are not compatible with horizontal brake booster mounting patterns (or with the existing horizontal mounting patters, if mounted directly to the firewall).

Photo of a 1996 Mustang GT hydroboost brake unit I have. Notice vertical MC mounting flange pattern; http://img178.imageshack.us/img178/4207/hydroboostan0.jpg


http://www.ultrastang.com

ultrastang said:

A Drum/drum dual reservoir MC will have an RPV (Residual Pressure Valve) installed in both ports. A disc/drum dual reservoir MC will have one RPV in the secondary side port feeding the rear (drum) brakes.

A 4-wheel disc MC will not have any RPVs installed in the MC. If you use a Disc/drum MC on an all-wheel disc setup, the rear discs will drag, causing excessive heat build up and accelerated pad and rotor wear.

Click to expand...

So I assume this is true on a 1969 Disc/Drum MC as well then?

Has anyone used an 86 SVO MC on a 1969 booster?

I have stock front 69 disc and SN95 rears going together using Ultrastang's brackets. I already have a variable porp valve installed but am not sure on exactly which MC I will need.

Good thread for sure.

-Stephen

ultrastang said:

In 1996, the SN-95 Mustang GTs and Cobras were no longer available with vacuum boosters. They were switched over to hydroboosted brakes. --I'm not sure if the '96-later V6 Mustangs continued to use vacuum boosters. http://www.ultrastang.com

Click to expand...

Now, there was a brain fart! --Of course the '96-'04 V6 Mustangs continued to use vacuum boosters, because their MC's continued with the horizontal flange mounting pattern on the SN-95 Mustangs through '04. --'96-'04 GT/Cobras went to hydroboost brake units.

Pre-'99 V6 MCs had 1-1/16" bores. '99-'04 V6 MCs had 1" bores.


http://www.ultrastang.com

Ok, I messed up big time. I couldn't find my notes, but I did find the receipt.

1994 ford mustang........


I swear it was a 15/16" bore tho........ tell me that I wasn't wrong on that to...

Yea it is 15/16" from what i've read, i dont recall are you using a booster or not?
I'd love to see a pic of this MC mounted directly to the firewall.

Other option im looking at is a 88 daytona mc that is a 7/8" bore but would prefer a ford part but just not finding what i need at the moment.