Jeep Grand Cherokee SRT 2018 Owner's Manual page 151

• If your SRT vehicle is equipped with Drive
Modes they will alter the vehicle's performance
in various driving situations. It is recommended
that your vehicle operates in SPORT or TRACK
modes during the track event.
• Prior to each track event/day, verify all fluids
are at the correct levels. Refer to "Fluid
Capacities" in "Technical Specifications" for
further information.
• Prior to each track event, verify the front and
rear brake pads have more than ½ pad
thickness remaining. If the brake pads require
changing, please burnish prior to track outing
at full pace.
NOTE:
Use of DOT 4 brake fluid is suggested for
extended track usage due to increased thermal
capacity.
• At the conclusion of each track event, it is
recommended that a brake bleed procedure
is performed to maintain the pedal feel and
stopping capability of your Brembo High Per-
formance brake system.
• It is recommended that each track outing
should end with a minimum of one cool down
lap using minimal braking.
• If equipped with a removable lower front
fascia grille, it is recommended to remove it
for track use during warm/hot weather to
improve cooling airflow to critical powertrain
and cooling system components.
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• All SRT vehicles are track tested for 24 hours
of endurance, however, it is recommended
that suspension system, brake system, prop
shaft, and ½ shaft boots should be checked
for wear or damage after every track event.
• Track usage results in increased operating
temperatures of the engine, transmission,
driveline and brake system. This may affect
noise vibrations and harshness (NVH) coun-
termeasures designed into your vehicle. New
components may need to be installed to
return the system to the original NVH
performance.
• Tire pressure:
• 40 psi (276 kpa) hot, recommend 32 psi
(221 kpa) front, 30 psi (207 kpa) rear cold
NOTE:
It is recommended that you target 40 psi
(276 kpa) Hot Tire Pressure at the conclusion of
each track session. Starting at 32 psi (221 kpa)
Front & 30 psi (207 kpa) Rear Cold and adjust-
ing based on ambient & track conditions is
recommended. Tire pressure can be monitored
via the instrument cluster display and can assist
with adjustments.
Track burnishing your brakes:
To avoid "green lining fade" during track use, the
brake pads and rotors must have a thermal
burnish for factory installed components or
when new brake friction components are in-
stalled:
1. Use one track session to burnish brakes by
driving at 75% speed. Brake at approxi-
mately 0.60-0.80g maximum without ABS
intervention.
2. Lap the track in this manner until you start
smelling the brakes. Continue for another ½
lap at speed, then do a two lap cool down
with minimal brake applies. Make sure the
brakes are not smoking. If they are, do
another cool down lap.
3. Do not continue for more than one full bur-
nishing lap after you start smelling the
brakes. Do not get them smoking heavily.
This will get them too hot and affect their life
negatively in future track use.
4. Allow vehicle to sit and cool in the paddock
for at least 30 min. If an infrared thermal gun
is available, allow rotors to cool to 200°F
(93.3°C) before going back out.
5. There should be a thin, ash layer when
inspecting the pads installed in the caliper.
Having the ash layer go more than half the