Brake Pedal Travel Measurement and Inspection Non-Hybrid
Tools Required
J 28662 Brake Pedal Effort Gage
- With the ignition OFF and the brakes cool, apply the brakes 3-5 times,
or until the brake pedal becomes firm, in order to deplete the brake booster power
reserve.
- Install the
J 28662
to the brake
pedal.
- Measure and record the distance (1)
from the brake pedal to the rim of the steering wheel; note the points of measurement.
- Apply and maintain the brakes with 445 N (100 lb) of force
to the brake pedal, as indicated on the
J 28662
.
- While maintaining 445 N (100 lb) of force to the brake pedal,
measure and record the distance (2) from the same point on the brake pedal
to the same point on the rim of the steering wheel.
- Release the brakes and repeat steps 4 and 5 to obtain
a second measurement. After obtaining a second measurement, proceed to step 7.
- Average the first and second measurements recorded during the two applies
of the brakes.
- Subtract the initial measurement, unapplied (1), from the averaged,
applied measurement (2) to obtain the brake pedal travel distance.
Specification
Hydraulic assist equipped, maximum brake pedal travel (measured with the ignition
OFF, brake booster power assist depleted, and the brakes cool): 90 mm (3.54 in)
Brake Pedal Travel Measurement and Inspection Two-mode Hybrid
- Inspect the battery state of charge. Refer to
Battery Inspection/Test.
- Install a scan tool.
- Turn the ignition ON with the engine OFF.
- Using the scan tool, perform the following steps:
| 4.2. | Select the appropriate vehicle information |
| 4.4. | Select Electronic Brake Control Module (EBCM) |
| 4.5. | Select Special Functions |
| 4.6. | Select Pedal Travel Check |
- While observing the scan tool data display, slowly press the brake pedal with moderate effort to a force of 50 bar (725 lb in²).
- Record the distance the master cylinder primary piston has travelled at a pedal apply force of 50 bar (725 lb in²).
- Release the brake pedal.
- Wait 15 seconds, then repeat steps 5-7 to obtain a second measurement.
- Compute the average of the first and second measurements recorded during the brake applies.
Specification
Brake master cylinder primary piston travel, (measured with the ignition ON, engine OFF and the brake cool), at a brake pedal apply force of 50 bar (725 lb in²): 18 mm (0.71 in)
