TM 9-2320-272-24-1
1-23. COMPRESSED AIR AND BRAKE SYSTEM OPERATION
The compressed air and brake system takes filtered air, compresses it, and supplies it to various
components that enable the operator to slow down or stop the vehicle. This system also supplies compressed
air to air-actuated accessories throughout the vehicle. These components and accessories will be described
as part of the following systems:
a. Medium Wrecker Automatic Brake Lock System Operation.
The M936/A1/A2 Medium Wrecker Automatic Brake Lock System locks the service airbrakes when the
transfer case PTO lever is engaged. Major components of the automatic brake lock system are:
Key Item and Function
A TRANSFER CASE PTO LEVER - Opens the brake lock control valve through mechanical linkage
when engaged.
B BRAKE LOCK CONTROL - Allows air pressure to flow from secondary air reservoir to pressure
regulator and activate variable speed governor.
C PRESSURE REGULATOR - Reduces and regulates system air pressure to 70 psi (483 kPa) for
automatic brake lock application.
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