Tech Notes for the use of Morris Engineering Lightweight Rotors:
Morris Engineering Lightweight Rotors are a direct replacement for your original rotors. They must be properly installed by a trained individual in accordance with the procedures and
requirements of the vehicle manufacturer. If you are not comfortable performing such work on your vehicle please seek assistance.
New rotors are covered with a light oil and placed in sealed packaging to prevent rust during shipment. Do not open the sealed packaging before you are ready to install the parts.
Remove the light oil from the friction surfaces of the rotor using brake parts cleaner applied to a rag. (Do not allow the brake pads to contact the oiled surface)
Reminder: After installation, and prior to driving the vehicle, stroke the brake pedal several times to ensure the brake caliper pistons are moved to the operating position. This will
ensure the brakes are working when the vehicle is initially driven.
When driving the vehicle for the first time, use the brakes moderately for the first 50 stops. This will allow the rotors to gain a transfer layer of pad material on the friction surfaces.
As the rotor rings are cast iron, they will oxidize over time and the areas not swept by the brake pads will gain a rust color. This surface rust is normal and not a cause for concern.
Ford has provided excellent instructions for the removal and replacement of the front rotors. For a rotor install, you will not have to disconnect the brake lines as described. (simply
unbolt the caliper and support it to avoid stress on the brake hose)
Morris Engineering Lightweight Rotors are only suitable for light track duty such as beginner HPDE and brief time trials. Use in this environment greatly increases the energy absorbed by your
brake system, and without proper preparation, your brakes can overheat and cause reduced or ineffective braking capabilty. This is serious business. The power generated by modern
American V8 engines allows late model pony cars to reach speeds of 140mph or more on track. Brake overheating at those speeds can turn a fun day at the track into an expensive lesson.
We advise anyone (whether using our products or not) taking their street car to a road course to prepare in the following manner:
Brake pads: OEM brake pads are formulated for cold stop performance and low noise. They quickly overheat on-track. Upgrade to proper high-temperature pads for track use, and
remove them when you get home if you will be operating on the street. Race pads will quickly wear rotors if operated on the street due to their abrasive nature at cold temperatures.
Avoid ceramic pad materials.
Brake fluid: Replace your brake fluid with a high-boiling point product. Castrol SRF is our recommendation (it is very expensive and worth every penny). Over time, brake fluid
absorbs water, and that water will boil at a much lower temperature. For this reason, it is important that your fluid is fresh and properly bled.
Cooling air: Vented rotors are designed to draw cooling air from the center while in motion. Unfortunately, production cars fail to provide ducting that can supply this air. The
correct solution is routing cooling air from the front of the lower bumper where it is under high pressure, through flexible, high-temperature silicone hose, to backing plates designed to feed
the air to the eye of the rotor. They are a hassle to source, install, and remove (if necessary) for street use. They are also crucial to having a safe, dependable brake system at the
Finally, a general comment on track use. Our Lightweight Rotors are designed to improve vehicle performance on the street and autocross courses, on tires with capabilities similar to those
originally fitted to the vehicle. There are plenty of products available for heavy track use, or in combination with upgraded power and tire capability. Follow the guidelines listed
here, and always leave margin for a car suddenly spinning in front of you, or covering the track surface in oil or coolant. You cannot win the HPDE session...but you can certainly lose.
Wear and Replacement
The rotors should be replaced when the thickness measures < 30.0mm. Replacement rotor rings are available at a reduced cost and include new hardware and installation instructions.