How do you perform the applied stroke method to measure pushrod stroke, and what is the required pressure range for this test?

1. With system pressure at 60 psi, pull the pushrod by hand and measure travel
2. Scribe the pushrod, make a full brake application with 90-100 psi in the system, and measure the distance between the scribe mark and chamber face
3. With engine running at fast idle, measure the time it takes the pushrod to extend
4. Fully cage the spring brakes and measure the length of the caging bolt