Tools Required

J 26900-6 Dial Caliper

1. Remove the two 2nd coast brake servo cover seals from the 2nd coast brake servo cover.
2. Remove the seal (2) from the 2nd coast brake piston (1).
3. Remove the following components from the 2nd coast brake piston:

•	The 2nd coast brake piston rod

•	The 2nd coast brake piston rod E-ring




4. Remove the following components from the 2nd coast brake piston rod (1):

•	The 2nd coast brake inner return spring (3)

•	The 2nd coast inner return spring seat (2)

5. Clean all of the 2nd coast brake components and dry the components thoroughly.
6. Inspect the following components for cracks or porosity. Replace the components as necessary:

•	The 2nd coast brake servo cover

•	The 2nd coast brake piston (4)

7. Inspect the following components for distortion or excessive wear. Replace the components as necessary:

•	The 2nd coast brake inner return spring

•	The 2nd coast brake outer return spring

8. Inspect the 2nd coast brake band lining for cracks or excessive wear and replace as necessary. If the 2nd coast brake piston stroke is not within specification, measure the 2nd coast brake piston rod length to determine a suitable replacement 2nd coast brake piston rod.
9. Use the J 26900-6 in order to measure the 2nd coast brake piston rod length.
10. If the 2nd coast brake band appears to exhibit little or no wear, select one of the two different size piston rod lengths available in order to lengthen or shorten the 2nd coast brake piston rod stroke until the stroke is within specification.

There are two 2nd coast brake piston rod lengths available:

•	72.90 mm (2.870 in)

•	71.40 mm (2.811 in)

1. Install the following components onto the 2nd coast brake piston rod (1):

•	The 2nd coast brake inner return spring seat (2)

•	The 2nd coast brake inner return spring (3)

2. Install the 2nd coast brake servo piston rod into the 2nd coast brake piston (4). Secure the servo piston rod with one E-ring.
3. Install the new 2nd coast brake piston seal onto the 2nd coast brake piston.
4. Install the 2 new 2nd coast brake servo cover seals onto the 2nd coast brake servo cover.