Master Cylinder Adapter kits, 3-2 Port kits
for the 87-93 Mustangs (excluding 93 Cobra):
*** scroll
to bottom of page to order ***
The stock master cylinders on the 87-93 Mustangs are marginal with
just the install of larger front 73 calipers, and cannot be used if
you install rear disc. You have to swap out to a newer 2 port 4 wheel
disc unit from the newer Mustangs! The small 21mm bore size (about
~7/8") is to small for use with anything but the stock brakes. Even
the 94+ Cobras use the smallest bore on a 4 wheel disc car which is
15/16"! There is also the problem of not getting equal pressure
to both front tires that the 3 port design is really to blame. This
is also solved with a 2 port MC design and will keep your front tires
with the same brake pressure (preventing prematurely locking up one
front tire under hard use),
There are 5 common MC upgrades out there for the Mustangs: the Lincoln/SVO
unit, the 85 TownCar, the '94-98 GT unit, the '93 Cobra unit and the
'94-95 Cobra units. Each is a 2 port MC, so a conversion will be needed
but they are all different bore sizes. Which one is the correct unit
for you? Depends on the car and the brake system. The 79-86 mustangs
have SAE threads on the master cylinders and the 87+ all use metric
threads. The Lincoln/SVO unit should only be used if you are
using the 73mm front calipers and the lincoln or caddy rear
disc! The 85 Town car is a good unit for the 79-86 cars since
it also uses SAE threads and has a 1" bore size. For the 93 Cobra and
94+ vacuum boosted master cylinders, it will depend on the calipers
and engine you have in the car as to which one is correct. The
larger the bore size, the stiffer the pedal will be.
The adapter kits that I am selling here is compatible to replace the
stock master cylinder in the '87-93s to use the 93 Cobra 1" bore unit,
the '94-98 V6/GT 1 1/16" bore unit or '94-98 15/16" bore Cobra units
with specific kits ! These kits are a direct bolt in for the master
cylinder that you are using! There are no flaring of the lines, just
gentle bending of a few lines! Everything installs under the proportioning
valve for a clean, sanitary look unlike other kits on the market.
Here is a basic drawing of how the kits work:
Since you cannot just bolt in a new master cylinder to the 87-93 cars,
you have to first convert the 3 port to a 2 port design and secondly
adapt any fittings for the different thread sizes on the master cylinders!
Here are the details of what master cylinders these kits works with:
Using '93 Cobra, '94+ v6/Cobra/GT master cylinders for rear disc conversions:
The 87-93 mustang master cylinders were a 21mm, 3 port
design and will create a very spongy pedal. To run rear disc with
these cars, you have to install a new, larger bore 2 port 4 wheel
disc master cylinder. Since the front brake lines are both screwed
into the stock master cylinder, you need a way to convert them to
use the new 2 port master cylinder! This kit will allow you to do
this with the '93 cobra, and '94+ master cylinders including the
V6, GT and Cobra units!
These kits will convert your 3 port master cylinder setup to a 2 port
setup to run larger calipers and rear disc with the newer mustang master
cylinders! Email me with any questions! This is a great, clean way
to convert over at the right price! Each kit comes complete with instructions
on how to install it! Compare the the features and prices to other
kits on the market, and you will be back to order!
No Cut, No flare
Conversion kits:
'94-98 V6/GT & 93 Cobra Kit $25.00 -- for use with the '94-98 V6/GT
1 1/16" bore vacuum boosted units and 93 Cobra 1" bore master cylinders.
Best all around value for price, size and pedal feel with rear disc
or drums and most all front calipers! Use the 93 Cobra for a softer
pedal feel when running an aftermarket cam rather than the 94-98 GT/V6
unit
'94-95 Cobra Kit $35.00 -- for use with the '94-98 15/16" bore
master cylinder
'99+ V6 Kit $32.50 --
for use with the 1.000" & 1.006" '99+ v6 master cylinders. These
have different port threads than the previous '94-98 units and requires
an extra fitting. Also you will need to convert over the wiring harness
to the '99+ plug as it is different than the stock 87-93 fox body or
reuse the stock low fluid sensor.
'94+ GT/V6 MC Conversion fittings -- For use on the 94+
GT/V6 cars with Vaccum boosters ONLY to use the '94-95 Cobra Master
cylinder. Direct bolt in! No cutting, no flaring!
Keep in mind that due to all the differences that can be had with the
brakes and vacuum of the motor, you may also need a larger brake booster
to get an acceptable pedal feel. You can get these from the 94+
vacuum boosted mustangs to increase the amount of boost.
The stock proportioning valve
will need to be modified if you go to rear disc or to install
an adjustable proportioning valve. You will need the FMS
part: M-2450-A and an adjustable proportioning valve to
complete the modification. The stock PV is housed
in the combination block under the MC towards the front
of the car. The rear of the combination block housed
the shuttle valve or pressure differential valve. Do
not touch this shuttle valve assembly in the combination
block.
Why do you need to modify
the proportioning valve? Because it is designed for the
specific car and brakes that come with it off the assembly
line. So if you change to different size brakes, you will
need to change the front to rear bias via the proportioning
valve. If you do not, then you will not get the most braking
capability out of the car. Worst case scenario, you have
too much rear bias and the car spins around when the brakes
are applied. Not good on a rainy night! Why
not use a Sn95 unit? First off there is two different
styles on the 94+ Mustangs. The non-ABS cars have
a unit with a factory 3rd port out the back of the valve. You
could use this housing unit to convert to a 2 port MC,
but you have to get the brake line nut off the 3rd brake
line. You will not find that nut at any parts store. The
ABS equipped mustangs do not have this 3rd port and are
mounted differently in the car. With either unit,
the bias is built for the newer Sn95 cars. Thus the
bias on these units is just as wrong as your stock unit
for use with rear disc. You need to set the bias
properly for your car which means you have to install an
adjustable valve after defeating/gutting the stock PV unit.
Okay, so how do you "gut" this proportioning
valve? You use a 13/16 wrench and take the front cap off of it. Be
careful as once it is loosened, the spring will shoot it out! Then
remove the spring, the spring seat and rod and discard. You may need
some needle nose pliers to remove the rod from the valve. Do NOT remove
the rear spring and rod from the rear of the valve. Transfer
the rubber O-ring from the stock end cap to the FMS M2450A unit and
install the FMS plug.
Once you are done modifying the stock valve,
you need to install an adjustable unit. There are two kinds of adjustable
units: knob style and lever style. The lever style is more designed
for an in-car application so that you can adjust the bias as the tires
and brakes wear down in a race. You want the knob style. To install
it, remove the coupler along the passenger side firewall and replace
that with the valve. [pic]
When you bleed the brakes, adjust the valve all
the way in for the maximum rear pressure. Once done, adjust the valve
all the way out, and then in 4 full turns for your initial setting.
Adjust in 1 turn increments from there and then half turn increments
to fine tune. You will feel the braking and the pedal differ as the
bias is changed.
PV parts to purchase:
FMS M-2450-a Plug, $12 each -- solid
endcap required after modifying the proportioning valve.
Required when using rear disc. Sold at no cost.
Others parts available:
*Modified Ebrake handles to defeat the self adjusting
mechanism. Modified like the M2300K kit instructions.
A must have when using the rear disc brakes conversions. (FMS
M-2810-A cable is required in addition) Done on
a core/exchange basis
*Rear brake line adapters for use when using stock
87-93 drum brake hard lines and connecting the SN95 or TurboCoupe softlines.
*Fox3 to SN95 front passenger brake line fitting. Allows you to run
the SN95 front brakes lines on a Fox3 car.
*94+ Cobra/Bullitt/Baer/Corvette/M2300K PBR banjo bolts. High flow
units!
Payment
methods accepted: PayPal Preferred!!! Money order or
cashiers check only!
 
Info, questions and support, Email: mjbobbitt@yahoo.com or
look in our FAQ section
You can also reach me on ICQ #: 1085004
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