T6.7.2 Rollover stability will be evaluated on a tilt table using a pass/fail test. The vehicle must not roll when
tilted at an angle of sixty degrees (60°) to the horizontal in either direction, corresponding to 1.7 G’s.
The tilt test will be conducted with the tallest driver in the normal driving position.
ARTICLE 7: BRAKE SYSTEM
T7.1 Brake System - General
The car must be equipped with a braking system that acts on all four wheels and is operated by a
single control.
T7.1.1 It must have two (2) independent hydraulic circuits such that in the case of a leak or failure at any
point in the system, effective braking power is maintained on at least two (2) wheels. Each hydraulic
circuit must have its own fluid reserve, either by the use of separate reservoirs or by the use of a
dammed, OEM-style reservoir.
T7.1.2 A single brake acting on a limited-slip differential is acceptable.
T7.1.3 The brake system must be capable of locking all four (4) wheels during the test specified below.
T7.1.4 “Brake-by-wire” systems are prohibited.
T7.1.5 Unarmored plastic brake lines are prohibited.
T7.1.6 The braking systems must be protected with scatter shields from failure of the drive train (see T8.4) or
from minor collisions.
T7.1.7 In side view no portion of the brake system that is mounted on the sprung part of the car can project
below the lower surface of the frame or the monocoque, whichever is applicable.
T7.1.8 The brake pedal shall be designed to withstand a force of 2000 N without any failure of the brake
system or pedal box. This may be tested by pressing the pedal with the maximum force that can be
exerted by any official when seated normally.
T7.1.9 The brake pedal must be fabricated from steel or aluminum or machined from steel, aluminum or
titanium.
T7.1.10 EV ONLY: The first 90% of the brake pedal travel may be used to regenerate brake energy without
actuating the hydraulic brake system.
The remaining brake pedal travel must directly actuate the hydraulic brake system, but brake energy
regeneration may remain active.
Any strategy to regenerate energy whilst coasting or whilst braking must be covered by the FMEA
T7.2 Brake Test
T7.2.1 The brake system will be dynamically tested and must demonstrate the capability of locking all four
(4) wheels and stopping the vehicle in a straight line at the end of an acceleration run specified by the
brake inspectors.
T7.2.2 EV ONLY: After accelerating the tractive system has to be switched off by the driver and the driver
has to lock all four wheels of the vehicle by braking. The brake test is passed if all four wheels lock
while the tractive system is shut down.