11. Antilock-braking systems prevent skids by automatically easing the brake pressure on the wheels before they lock up. 12. The event recorders register a number of functions on the train, including speed, brake pressure and signals. 13. Here, applied brake pressure at the front is also applied to the rear wheel and vice versa. 14. The investigation also found that, upon landing, brake pressure increased in a manner consistent with autobrake application. 15. When brake pressure is applied, the pistons are forced out pushing the shoes into contact with the drum. 16. A main brake pressure reservoir of 125 litres and a service pressure reservoir of 75 litres are provided. 17. The roll system applies bursts of brake pressure to certain wheels to counteract forces pushing the vehicle over. 18. If you just can't resist the temptation to brake, make sure it is the lightest brake pressure possible. 19. This essentially allows engineers to exert braking pressure from the back of the train as well as the front. 20. ABS " helps prevent loss of control situations by automatically controlling the amount of braking pressure applied to a wheel.