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"Twin Stop" Instructors Brake
Installation Instructions

A hardcopy of the installation instructions is provided with each kit we send. We provide you with the following transcript for viewing on-line.


TWIN STOP Installation Instructions

Due to the large variance in engineering and the numerous makes and models off cars available to north American consumers it would be very costly to engineer a dual braking system that would readily bolt into any one application. For this reason it is up to the installer to use some creativity in installing this unit for its intended application.

(fig. 1) Dual Brake Nomenclature
Instructor Brake Installation Instructions
Handy Items To Have For Installation: Along with your commonly used mechanics tools the following items will proof to be handy: pins, trouble light, wire, exacto knife, tape

Part A: Determining Position of the Instructors Brake

This will be as high on the firewall as possible the limitation being the heater ducts, and as far to the right as possible the limitation being the wheel well. The "Passenger Side Hinge" and the first 6" of "Cable Housing" should not be obstructed so that it can freely move through its 15-degree arc: Also the "copper stop" on the cable should be unobstructed so it can move freely. Insert a pin into the carpet to mark the position of the "Upper Mounting Hole".

Depending on the floor angle and configuration of your vehicle it may be desirable to elevate the lower section of the base: This can be done by cutting and bending the piece of blank metal provided or putting a piece of wood that is the proper thickness under the bottom of the instructor's brake.

Important Tip #1: As another option the "Base" can be removed from the unit and turned 180 degrees so that the "Lower Mount Holes" come to the top: See the TWIN STOP Instructor Brake User Information Sheet (shown at the bottom of this web page) for a diagram of this configuration. On many vehicles this configuration will work better: It allows for the fastening of the unit using only the two "Lower Mount Holes" (now turned to become upper mount holes). These upper fastening holes are the critical ones: There is no need for a fastener lower down because when the Instructor applies force to the pedal the lower part of the "Base" presses against and is supported by the floor. This option also eliminates damaging the carpet lower down where it will be more noticeable when the Instructor's brake unit is removed.

Note that there is only one "Stud Plate" and "¼ Inch Carriage Bolt" provided with the kit: If you are using this option you may want to manufacture a second "Stud Plate" or make a long mounting plate that will provide for both fastening locations.

Thread the cable into the "Cable Housing" and determine how the it will be run over to the driver's side: The path needs to be as straight as possible.

Part B: Place "Clamp Assembly" On The Brake Pedal

Place the "Clamp Assembly" on the cars brake pedal as close to the brake pedal rubber as possible (fig. 1) and (fig. 2).

Part C: Determining Position Of The Driver's Side "Floor Assembly"

The "Floor Assembly" should be positioned to the right or left so that the "Round" of the "Clamp Assembly " will just come along side the hinge pulley upon complete brake deflection. Also the Driver Side "Floor Assembly" must be positioned up or down on the firewall so that it matches the position of the "Clamp Assembly" on complete deflection. See various views (fig. 2) and (fig. 3).

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Finding the proper position is not easy and takes some care and patients. Start the car so that the vacuum of the cars power brakes allows the pedal to move to the floor as much as possible. Take the "Floor Assembly" with your right hand and push down the cars brake pedal with the other: Move the pedal down a view times and project where the "Cable Assembly" will reach the floor upon complete pedal deflection: Move the "Floor Assembly" beside this projected position so that upon complete brake deflection the position of the drivers side parts will look similar to what is shown in (fig. 2) and (fig. 3). Turn the "Floor Assembly" so that the hole for the "Cable Housing" is pointed in the direction of the intended cable path that was determined in Part A (fig. 2). If you are knowledgeable in auto mechanics it is also possible to take the guess work out of this by opening a bleed screw and actually pushing the pedal to the floor.

Mark the position; pins inserted into the carpet is often a good way to do this.

(fig 2) Proper Assembly And Positioning Of Driver's Side Parts
Instructor Brake Installation Instructions
Part D: Plan and Install Driver's Side "Floor Assembly"

Once the proper position is found determine what problems will be encountered in mounting; don't be to discouraged if you find that some car component is getting in your way, probably the steering column X/#?/^^##. This being the case it is up to the installer to custom make a bracket by cutting, bending and drilling the blank piece of metal provided: This can be mounted with self tapping screws fastened into the cars firewall in safe locations and the drivers side floor assembly mounted to this using the carriage bolts that came with the "Mount Plate" (in this case the "Mount Plate" is discarded) (fig. 3).

This is the critical part of a proper installation: The unit cannot be expected to work properly if the "Floor Assembly" is not at its proper position.

Important Tip #2: When drilling holes start with a small drill, maybe 3/32: Drill carefully and don't allow the drill to pop excessively into the other side: It is going to be very difficult to determine what you are drilling into especially for the first hole. Once the first hole is drilled you can insert a piece of wire to carefully analyze where you are drilling; thus being assured of drilling the remaining holes safely.

Important Tip # 3: Use a 3/32 drill for the self tapping screws: If the hole went through more the one layer of metal and it is hard to screw in the self taps don't hesitate to enlarge the hole with a bigger drill: Don't try to force in the screw; it will just break and much time will be wasted trying to correct the situation. If the hole is going through a frame section a drill very close to the self-tapping screws outside diameter will have to be used.

Drill holes through carpet and under padding (or cutaway under padding and pull away carpet; this will depend on the type of vehicle and what you find better), drill and manufacture optional bracket as in (fig. 3), and install "Floor Assembly". It will be easier to remove the "Mount Plate", fasten it along with the carriage bolts first and then fasten the remainder of the "Floor Assembly" over this. If the custom made bracket is being used it is best to mount this to the floor first (before drilling the holes for the "Floor Assembly") and then go through the positioning exercise as described in Part C; this time marking the "Floor Assembly" position on the custom made bracket. The bracket can then be removed, the holes drilled for the floor assembly, the assembly mounted to this, and the bracket reinstalled in the car. See tips # 2 and 3 mentioned above.

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(fig 3) Installer Made Bracket For Proper Positioning Of Driver's Side "Floor Assembly"
Instructor Brake Installation Instructions
Part E: Install Instructors Brake

Using an exacto knife cut an approximate 3/8 inch diameter "carpet hole" in the carpet at the pin location determined in Part A. If there is easy access to the under side and if you have the aid of an assistant you may prefer to install the instructors brake using a bolt and a nut on the under side; but in most cases, due to limited access on the under side, it will be necessary to use the "Stud Plate" and "¼ inch Carriage Bolt" fastened with self taping screws (fig. 1).

Mark the position of the "carpet hole" onto the under padding. Pull back the carpet and using an exacto knife cut away the under padding to about the size of the stud plate. Replace the carpet and project the "carpet hole" onto the cars metal firewall with a black marker. Hold the large hole of the "Stud Plate" over the mark and drill the hole for the first self-taping screw: Be careful, read the important tip # 2 mentioned before. Drill and fasten the remaining screws: Remember important tip #3 mentioned before. Now unfasten the screws and punch the "¼ Inch Carriage Bolt" into the "Stud Plate" and reinstall. Replace the carpet with the carriage bolt sticking out through the "carpet hole". Install the instructor's brake over this carriage bolt stud. Self-tapping screws can then be used in the bottom two holes along with the optional elevation bracket or wooden block that you may have decided on in Part A.

Part F: Final Assembly

Route the "Cable Housing" to the other side according to the path determined in Part A. The "Cable Housing" will have to be cut and deburred to the length needed.
Working from the driver's side use the right edge of a piece of tape to mark where the "Cable Housing" will have to be cut. (The right edge is used because if the cut is made on the wrong side of the tape it will be to long and a second cut can be made instead of the housing being scraped.) When determining the length of the "Cable Housing" leave 3/8 of an inch to go into "Driver's Side Hinge". Make sure the housing is not cut to short: It should be well seated into the hole at each end with out being stretched. It is better the housing is a little longer than to short.

When the housing is marked remove it from the car and take it to a workbench. Cut the housing with a pair of wire cutters leaving about 1/8 inch longer for the finish grinding. With an exacto knife trim off ½ an inch of the black vinyl outer casing. Using a bench grinder grind the metal coils down flat: Have a cup of water near by to keep the housing cool thus avoiding as much as possible melting the inner plastic sleeve. (A file can be used for flattening the coils but grinding is recommended.) Clean the hole with a 5/64 drill.

Replace the cut "Cable Housing" and poke the cable through hole of the "Drivers Side Hinge". Route the cable around "Clamp Assembly" according to (fig. 2) and under the squash plate according to (fig. 4). Pull the cable through to allow dual brake to come to its upright position and tighten the "Squash Plate Nut".

(fig 4) Proper Routing Of Cable Under "Squash Plate"
Instructor Brake Installation Instructions
Fasten the "Installation Spring Strap" about half way up the brake arm; drill a small hole in the bottom edge of the dash; bend the "Installation Spring" as needed and hock between these locations (fig. 1). This spring is installed to offset the pull that the cable applies to the brake pedal so that it stays all the way up and does not activate the brake lights. Or, If there is difficulty finding a place under the dash to fasten the spring you may want to consider eliminating this step by reducing the tension on the cable: This can be done by sliding the spring off the pin on the, main, instructor's side unit and tying it back so that it doesn't interfere with the working of the instructor's brake. If the housing path is fairly short and strait the unit will work perfectly well with the reduced cable tension.

Part G: Test

Road test the installation from the driver and instructor's side: Check to make sure the brake lights are coming off.

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TWIN STOP Instructor Brake User Information Sheet

Please retain this sheet for cars Owner/Operator.

Maintenance:
The cable after having been subject to numerous cycles will begin to show signs of fatigue failure: After 18,000 km (11,250 miles) the cable needs to be replaced or inspected regularly on a bimonthly interval. Inspection should be done in two critical locations as follows:

1
On the driver side: In the area were it leaves the cable clamb assembly headed to the floor assembly. Push the brake pedal down with one hand and with the other pull up the cable so that you can inspect it in the area where it has been bending around the aluminium spacer.

Instructor Brake Installation Instructions
2
On the passenger side: In the area of reverse bending. With the cars engine running (so that the braking systems power assist moves the pedal to the floor as much as possible) push the Instructor's brake down and inspect the cable in the area between the two pulleys.

Feel the cable in these two areas to determine if there are any broken wires. Be Carefull: the wires can be quite sharp.

If broken wires are detected replace the cable within the next 2000 km (1250 miles).

Floor Mats And Other Objects:

A properly installed unit will run smoothly with both brake pedals working in unisons. Underneath the cars brake pedal on the drivers side you will notice the floor assembly containing a pulley with a cable run up to the brake pedal. These parts need to remain undisturbed in order to run properly. If floor mats are being used it is important that they stay in place and don't slide up into this assembly.


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