With engine running and transmission in PARK or NEUTRAL, block wheels and
release parking brake.
Install the Brake Pedal Effort Gauge 021-00001 or equivalent and check
brake pedal travel as follows.
Hook a steel measuring tape to the brake pedal. Measure and record the
distance from the brake pedal free height position to the reference point,
which is at the six o'clock position on the steering wheel rim. Refer to the
illustration under Brake Pedal Free Height Measurements, Step 2.
With the steel tape still hooked to the brake pedal, depress the brake
pedal by pressing downward on the brake pedal effort gauge. Apply a 111 N (25
lb) load to the center of the pedal. Maintain the pedal load and measure the
distance from the brake pedal to the fixed reference point on the steering
wheel rim parallel to the centerline of the steering column.
The difference between the brake pedal free height and the depressed pedal
measurement under a 111 N (25 lb) load should be 79mm (3.1-inch) maximum.
If the pedal travel is more than the maximum dimension specification, make
several reverse stops with a forward stop before each. Move the vehicle in
reverse and forward for approximately ten feet. Then, apply the brakes holding
the brake pedal down until the vehicle is completely stopped. This will actuate
the brake self-adjusters. If these stops do not bring the brake pedal travel
within specification, make several additional forward and reverse stops as
outlined above.
On self-adjusting rear drum brakes, if the second series of stops does not
bring brake pedal travel within specification, remove brake drums, and check
the brake adjusters to ensure they are functioning. Check brake linings for
wear or damage. Service or replace all worn or damaged parts and
non-functioning adjusters. Adjust the brake lining outside diameter to the
approximate inside diameter of the brake drum with Brake Adjustment Gauge
D81L-1103-A or equivalent. Refer to Section 06-02.
If all the drum brake adjusters, brake drums, and brake shoe linings are
functional and brake travel is not within specification, check pedal assembly
for missing or worn bushings or loose attachments.
If the above Steps do not bring the brake travel within specification,
bleed the brake system.
