Parking Brake On Disc Brakes Mechanical Releasing - Volvo 9700 US/CAN 2016 Driver's Handbook Manual

156 If something happens

Parking brake on disc brakes mechanical releasing

The Volvo 9700 US/CAN bus is equipped in
all axles with disc brakes, which in the drive
axle can be mechanically released if there's
no enough air pressure to release the parking
brakes.
To do this, proceed as follows:
1 Block the drive wheels or clamp a towing
bar to another vehicle in order to prevent
the vehicle movement when releasing the
parking brake.
2 In the disk brakes set for the drive wheels,
both brake cylinders are equipped with
a release screw, screw until you see out
a red plastic button in the center of the
screw, do this in the other brake cylinder
side, then the parking brakes are released.
The full compression of the parking brake
spring requires approximately 45 turns,
use the wrench, the socket and the fastener
shank found in the tool box. Whenever
possible try to fill with air the parking
brake cylinders, this makes easier to turn
the nuts of the release mechanism.
3 The bus can be towed when the parking
brakes are fully released. Remember to
make the bus towing must be done using
the drag bar.
For more information about two available
bus towing procedures, see the following
sections on this manual: "Towing", page
148 or "Alternative towing procedure",
page 151.
Note: Do not forget to reset the bolts to their
original position and attach the plastic cover
after towing has been completed.
DANGER
Block the drive wheels to prevent the bus
from moving when releasing the parking
brake. Failure to do so may be result in
serious personal injury or death.
T5014635