20 Things You Need To Know About Brakes


1. Brake system performance is dictated by front & rear caliper choices, master cylinder sizing, front & rear brake balance and choice of pad compounds.

2. Brake calipers should be mounted square with rotor to prevent excessive piston knock-back, pad drag and uneven pad wear.

3. Top stock car and road race teams usually replace caliper seals after any event where high temperatures are reached.

4. Differential piston bore calipers cannot be used interchangeably from side to side because it will cause increased pad taper and reduce overall braking efficiency.

5. Two of the reasons you may lose your pedal during a race may be due to:  an undersized brake system or inadequate ducting.

6. All new iron rotors and brake pads should be bedded-in before being used under racing conditions to prevent thermal shock and rotor warping.

7. If you can go to a smaller brake pad without running out of pad before you run out of event, then a smaller lighter caliper may be for you.

8. All caliper mounting bolts should be of the highest quality and lockwired for safety.

9. Bleed screws should always be replaced when new seals are installed in the caliper.

10. Replace rotor mounting bolts & lockwire whenever replacing rotors, and inspect mounting hats or hubs for signs of abuse.

11. Pedal fade can be the result of fluid boiling in the calipers, characterized by the pedal feeling spongy & traveling closer to the floor.

12. A larger master cylinder will reduce pedal travel but will also increase driver effort.

13. The Dry Boiling Point is the temperature at which a brake fluid will boil in its virgin non-contaminated state.  The Wet Boiling Point is the temperature a brake fluid will boil after it has been fully saturated with moisture.

14. In the latter stages of the race, a vibration in the brake system could be caused by pad material buildup on rotors or a cracked rotor.

15. A spongy pedal can occur because of:  air in the line, excessive caliper deflection, or incorrect caliper / master cylinder bore combination.

16. Once brake fluid has boiled, it no longer has the ability to resist further boiling , creates air in the system and should be completely flushed from the system.

17. An oversized master cylinder can cause your pedal to be hard to push.

18. Brake drag can be caused by a failing master cylinder, incorrect use of Residual Pressure Valves, misaligned calipers, seals in need of replacement or a badly adjusted brake pedal.

19. Brake drag may cause the brake pads to glaze, reducing friction and severely limiting the ability to stop the car.

20. The proper brake pad compound for you can be found through a trial and error process, or contact Randall Race Parts for recommendations.