4.8 Operation and maintenance of brake
system
4.8.1 Composition of brake system
The brake system of MT86 mining dump truck mainly
consists of two-circuit service brake (foot brake), auxiliary
brake (engine exhaust brake) and emergency/parking brake
(hand brake).
The two-circuit pressure brake is operated through the
pedal. Its working pressure is 1 Mpa, and the disconnection
pressure of pressure regulating valve is 1 Mpa. The first
circuit acts on wheels of middle and rear axles, and the
second circuit acts on the wheels of front axle. Once the
pressure in one of air reservoirs of the two circuits is below
0.55 Mpa, the low brake pressure warning indicator on
instrument panel will light up, and at this moment, it is
required to stop the vehicle immediately and find out the
causes of pressure falling.
Continuously and repeatedly applying full brake in a
short time may also lead to pressure falling below 0.55 Mpa.
Criteria for pressure inspection: Shut off engine and
apply hand brake. In 2h, the pressure falls by 0.05 Mpa at
most or in 30 min, it falls by 0.01 Mpa at most.
△
! CAUTION: Do not adjust the release
pressure of pressure regulating valve without
approval.
4.8.2 Engine exhaust brake
The MT86 mining dump truck is equipped with the
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