THEORY OF OPERATION - CONTINUED
BRAKE AND HYDRAULIC FAN SYSTEM - CONTINUED
Each individual service brake uses an
indicator pin to help determine amount
of wear on an existing service brake disc.
Oil groove depth is a critical dimension.
If oil groove depth on a brake disc is too
shallow, oil flow will be inadequate,
causing wear and abrasion.
An indicator pin is located on each side
of front and rear axle center housings.
When a service brake disc wears, dis-
tance between piston and plate
decreases, causing indicator pin to move
closer to flange face of axle housing.