MC help

[69gmachine]

I've decided to re-install the original power brake booster before I put the engine back in. I had been using the largest bore MC Strange makes (1.125 IIRC) with a manual pedal. It was fine for most situations, but one day the traffic came to a sudden stop, and I stood on the pedal with all my might and almost crashed into the car in front of me. I may have been able to solve the problem by going with a smaller bore (1.0625?) but I hated not using a perfectly good original booster, so I put it back on along with the matching power disc pedal and now need a new MC. The front calipers are 2 piston (about 1.6" dia) PBR units on 12.81" rotors while the rears have Wilwood discs. My problem is this: I can't find a master that will fit on the booster and has the bore sized right. I ordered a Master from MPB, but they sent a huge iron chunk that doesn't even come close to fitting in between the booster and the shock tower. I've got the engine ready to go back in and this is the only thing holding me up. I'm sure there are others out there with similar set-ups... anyone else using a stock Bendix booster with big front discs?

 

[mcode]

This is an answer

I encounter the same problems and the only answer is to purchase a power booster from hotrodusa (i think ($120) and use the master that you purchased---do not use your stock disc drum master as the rear resevoir is not enough to actuate the rear disk. ---you have to use your stock power disc brake

The Booster is i think 1 inch plus shorter than stock

I do not know of any master that will have enough volume to fit in the stock location without hitting the shock towers----believe me i checked.

Save yourself the headache and money and heed my advice or you will end up spending money needlessly ---

 

[69gmachine]

I'm afraid it's way too late to not spend money needlessly

Thanks for the input.

 

[Rusty67]

Use the SVO MC.

 

[69gmachine]

The SVO MC is over 8 inches long. It won't fit between the stock booster and shock tower. The 9" booster that Hot Rods USA sells will foul against my hydraulic clutch. Incidentally, the '85 Lincoln Town Car MC is the same Aluminum casting as the SVO MC but it has a smaller 1.0" bore vice the SVOs 1.125.

Thanks anyway.

 

[Rusty67]

If you are up for it you can use an 87-93 5.0 Fox booster which is a bolt in swap with the SVO. The 5.0 booster is slimmer and I think about the same diameter.

 

[ultrastang]

SN95 V6 4-wheel disc MC will work. It is ~7½" long compared to the Mk VII/SVOs
8-1/8" length.

'94-'98 SN-95 V6 MCs have 1-1/16" bore. '99-2004 have 1" bore.

1. SN95 V6 MC on Fox 5.0L booster in a '68 Mustang (Fox 5.0L booster nearly identicle in dimension as '67-'70 Mustang brake booster). http://img124.imageshack.us/img124/6593/foxboostermkviisn95mc00yf0.jpg

2. SN95 V6 MC on 2.3L Fox booster in a '65 fastback. http://img504.imageshack.us/img504/6876/kieths65053ly4.jpg

3. SN95 V6 MC on a stock '68 brake booster in a '68 Mustang. http://img504.imageshack.us/img504/1649/ron68sn95reardiscs5ib3.jpg


http://www.ultrastang.com

 

[69gmachine]

Thanks for the info Ultrastang! At this point it looks like I'll have to remove the booster no matter which way I choose to go. The cheapest thing to do would be to use a 1 1/32 bore Strange MC and stick with manual brakes, but that means I need to swap out my pedal again. If I decide to use power brakes I would need to buy a Fox booster and SN-95 MC.

I was only able to see the picture of the '68 with a Fox booster and SN-95 master. The server hosting the pictures must have went down after that. I'll try again later. Thanks for the pics.

 

[gsxrken]

69g- check you PMs. You can fit the later aluminum body/plastic reservoir ones between the stock booster and shock tower. They are about 7-1/2" long.
I've done it.

 

[CraigMBA]

If you're going to go manual, the correct MC is for a '94 Cobra application. Aluminum with a plastic resevoir. 15/16" bore. This is what Baer specs with all PBR systems they sell.

Do you have a power pedal or a manual pedal?

 

[69gmachine]

Thanks for the responses

I was able to see all the pics today. Thanks again Ultrastang!

gsxrken; I'm sold on the 94-98 V6 SN95 MC. After all the trouble I went through to install the power pedal and booster, I'd really like to leave them in place, although I still may have to remove the booster to install the SN-95 MC. At 7.5 inches it's gonna be a tight fit. Best of all is that I can go down to AZ and start today! Once I get the brake situation squared away, I can start putting the engine back where it belongs.

CraigMBA; I have both manual and power pedals. I actually tried a 15/16 bore MC, but I was never ale to get it bled properly. I think there was a leak between the two chambers in the MC itself. I really hate brakes!

 

[ultrastang]

If you're going to go manual, the correct MC is for a '94 Cobra application. Aluminum with a plastic resevoir. 15/16" bore. This is what Baer specs with all PBR systems they sell.

Do you have a power pedal or a manual pedal?

'93 (Fox) Cobra MC has 15/16" bore.

'94/'95 (SN95) Cobra MC has 1" bore. --'96-2004 GT and Cobra MCs were mounted on hydroboost units and have an offset vertical mounting flange pattern, so they don't work with vacuum boosters and would not bolt directly to the firewall/pedal support (at least not without re-drilling holes).

The '94/'95 SN95 GT and the '93 Fox & '94/'95 SN95 Cobra MCs look odd mounted in an early Mustang, because the reservoirs do not sit level in those applications, The reservoir runs down hill instead of more level like the SN95 V6 MC reservoir.

Notice that Reservoir sits pretty much level on the SN-95 V6 MC, when installed in an early Mustang:
http://img175.imageshack.us/img175/6199/kieths65052ko3.jpg

Notice the Cobra MC reservoir runs downward when mounted in a early Mustang:
http://img405.imageshack.us/img405/2084/94cobramc66mustangve5.png

http://www.ultrastang.com

 

[CraigMBA]

The piece I got came from Centric and was ordered as a '94 Cobra. I measured the bore and it's a smidge smaller than 1", so I just guessed it was 15/16".

If anyone knows it's Ultrastang, but I know I'm not cracked on this one. You're right, it looks wierd to have that angle. I can't use a power booster because of the cable clutch. It'll have to look wierd unless I can swap the tank.

Chalk it up to quality parts suppliers.

 

[ultrastang]

The piece I got came from Centric and was ordered as a '94 Cobra. I measured the bore and it's a smidge smaller than 1", so I just guessed it was 15/16".

If anyone knows it's Ultrastang, but I know I'm not cracked on this one. You're right, it looks wierd to have that angle. I can't use a power booster because of the cable clutch. It'll have to look wierd unless I can swap the tank.

Chalk it up to quality parts suppliers.

For the lack of a better term, the down tubes (coming off the bottom of the plastic reservoirs, where it "plugs" into the MC body), has the same spacing from the SN-95 V6 MC as the Cobra MCs.

You could swap a V6 MC reservoir onto the Cobra MC to get a reservoir that sits level. The bad part is you can't buy just the V6 reservoirs (new) from Ford --you have to buy the entire V6 MC/reservoir assembly.

If you could get a used/wrecking yard V6 MC to rob the resevoir off of and clean it up, you could go that route.

 

[gsxrken]

For the lack of a better term, the down tubes (coming off the bottom of the plastic reservoirs, where it "plugs" into the MC body), has the same spacing from the SN-95 V6 MC as the Cobra MCs.

You could swap a V6 MC reservoir onto the Cobra MC to get a reservoir that sits level. The bad part is you can't buy just the V6 reservoirs (new) from Ford --you have to buy the entire V6 MC/reservoir assembly.

If you could get a used/wrecking yard V6 MC to rob the resevoir off of and clean it up, you could go that route.

I didn't know that. Do I just tug it off and push on the other one? (I have both).

 

[ultrastang]

I often use these photos to illustrate how the SN95 GT and SN95 Cobra MC reservoirs mount at an extreme downward angle when being mounted in an early Mustang.

GT/Cobra MC in horizontal postion, reservoir tilts downward:
1. http://img122.imageshack.us/img122/1775/sn95mastercylinder008xo1.jpg

This is about how much incline the MC would have to have to make the GT/Cobra reservoir sit level:
2. http://img341.imageshack.us/img341/584/sn95mastercylinder007ge6.jpg

The MC body in the photos is an SN95 V6 MC. The Reservoir shown is a brand new GT unit from Ford. --as I mentioned, you can't buy just the reservoirs from Ford for the V6 MCs, but for some odd reason Ford does sell just the reservoirs for the GT models.

At any rate, you can see that the down tubes for the GT reservoir does line up with the bosses on the V6 MC body. So, the opposite would also be true.


http://www.ultrastang.com

 

[Grabber70Mach]

I have a question to see if I'm on the right track. I have a 70 Mustang 351C/Auto that has factory front disc brakes. I'm getting ready to do a Cobra brake upgrade front and rear. So if I understand ultrastang correctly, I can leave my stock power booster in and use a 94-98 SN95 V6 Master Cylinder for this setup?
Is there a stock style proportioning valve that can be used?

 

[ultrastang]

I have a question to see if I'm on the right track. I have a 70 Mustang 351C/Auto that has factory front disc brakes. I'm getting ready to do a Cobra brake upgrade front and rear. So if I understand ultrastang correctly, I can leave my stock power booster in and use a 94-98 SN95 V6 Master Cylinder for this setup?
Is there a stock style proportioning valve that can be used?

Yes, the MC should fit. You would need a 4-wheel disc valve from a 1994-2004 Mustang. The valve's ports will be metric, but you could get short lengths of tubing with metric fittings on the end to connect everything up.

This is a photo of a '68 Mustang with a 2003 V6 MC on a stock '68 booster, and a 4-wheel disc valve (the '67-'70 Mustangs have pretty much the same engine compartment configuration).

1. http://img294.imageshack.us/img294/3333/ron68sn95reardiscs4qu0.jpg

2. http://img294.imageshack.us/img294/5103/ron68sn95reardiscs5iw8.jpg

http://www.ultrastang.com

 

[Grabber70Mach]

Thanks, How would the short lengths of tubing with metric ends for the valve convert the metric theads over to standard threads to attach to my existing lines?

 

[ultrastang]

Thanks, How would the short lengths of tubing with metric ends for the valve convert the metric theads over to standard threads to attach to my existing lines?

You would have to use metric-to-SAE adapters, like the ones in this photo (adapters are the blue components). http://img294.imageshack.us/img294/3333/ron68sn95reardiscs4qu0.jpg

Or, cut one of the ends of the tubing, remove the metric fitting off that end, put an SAE inverted flare fitting on, and then double flare the end of the tubing. That would give you a metric fitting at one end, and an SAE fitting on the other.