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This time study was performed by an independant large fleet maintenance department.
Previously, this fleet was using the mark and measure method to check pushrod stroke on a mileage schedule.
Three methods were studied with the following results.

Method 1. Mark and Measure:
Marking each pushrod at the brake chamber face with a chalk (10 pushrods).
Applying the service brake (air pressure set at 100 psi).
Measuring each pushrod stroke.
This is the conventional method.
Method 2. Adjusting Slack:
Adjusting each slack by bringing the brake linings to contact the brake drums and backing off one half turn (10 slacks).
This method is only acceptable with manual slack adjusters. Adjusting auto slacks in this manner is often mistakenly used by maintenance personnel when brake stroke checks are requested. To adjust auto slacks in this manner instead of actual brake stroke measurement is not reliable. Seldom is there a check to verify proper operation of the auto slack adjusters or to verify that the pushrods are operating within the readjustment limits.
Method 3. The Solution:

With Safety-Check™ brake gauges installed and with brakes released, check that the clevis pin indicators are touching the front gauge pins. This position assures that the pushrods are at the fully released positions and not hung up.
Apply service brake (air pressure set at 90 psi.)
Check that all clevis pin indicators are not touching the rear gauge pins.

Not only is this the fastest method, but it has the added benefit of confirming that all brakes are releasing correctly. The time savings can be even greater, since NO tools are required and adverse conditions have little effect.

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