Cryogenics play an important part in the automotive industry. But what exactly is it?
It is part of a process known as "materials engineering," according to Praise Dyno Brake's founder and CEO John Ambrose, manufacturer of the highly touted, Praise Dyno Brake, "Stage III" pre-'70 musclecar brake pads and brake shoes.
Brake drums manufactured out of cast-iron retain heat and are prone to warpage. Cryogenically-treated, or "pressurized thermo-cooled" composite cast brake drums like those we offer as part of our Stage III Muscle Car kit for the '55-57 Chevrolets, dissipate heat as much as 50-percent faster than OEM, lessening the wear factor and possibility of warpage," says Ambrose. In the process, braking performance is enhanced along with the life of the overall product.
Pressurized thermo-cooling is a computerized controlled process in which the brake drums are slowly brought to a temperature of-310 degrees F, under pressure, held stable for 60 hours, and then slowly returned to room temperature. As a result the microstructure of the steel is changed by aligning the molecules, or bringing them closer together, eliminating air gaps (porosity) in the metal surface. The end result is an increase in component strength and density without extra weight.
Throughout this process, the pressurized thermo-cooled materials retain their original size and shape, and although this new cryogenized material is stronger at lower temperatures (following treatment) there is no change in yield or tensile strength.
This means it is possible to build a higher-tolerance, quicker heat-dissipating OEM-type brake drum which looks technically correct from the restorer's viewpoint, yet weighs approximately 24-26-percent less than its OEM cast-iron counterpart.
Praise Dyno Brake's "semi-ceramic" brake shoes also feature a higher coefficient of friction over straight metallic, or semi-metallic OEM brake shoes, creating less pedal pressure while stopping in shorter distances.
Praise Dyno Brake's "high volume" wheel cylinders are also a direct OEM replacement. However, these 1/8-inch-larger-bore wheel cylinders move more fluid through the system, requiring less pedal pressure.
The company's "Trick Spring Kit," features 31-psi "pullback pressure" versus OEM's Tri-5 13-pound tensile strength springs which tend to "ride" the swept surface of the brake drum causing excessive heat, and premature wear. When up grading your classic Tri-Five to Stage III fitment, the manufacturer recommends that you install one of their new, OE master cylinders to insure that your Tri-Five's brake pressure is performing at maximum capacity.