Sakai SW800 Series, Shop Manual

Page: 57 / 159

2-043
Brake System
3-2. Description and operation of parking brake circuit
Fuse
Fuse
OFF if brake pedal is depressed
and ON if not depressed.
Brake released
Brake pedal
When not depressed
1
4
3
5
Rear wheel
Front wheel
From charge circuit
To oil tank
9
8
7
11 10
12
SW8002032
3
1 2
5
1
4
3
5
Set to PARKING
Description:
• Consists of brake pedal (1), foot brake switch
(7), brake relay (8), parking brake switch (9),
brake release solenoid (10) and parking
brakes (negative brakes) (11), (12).
★
The foot brake switch is ON when the
brake pedal is not depressed, and OFF
if the pedal is pushed down on.
Operation:
Parking brake switch set to position
RELEASE:
• Setting the parking brake switch to the
RELEASE position causes the current to flow,
through terminals 1 and 3, to terminal 3 of the
brake relay.
• If, at this time, the brake pedal is not
depressed, foot brake switch (7) remains ON,
energizing the brake relay.
• This connects terminal 3 with terminal 5 of
the brake relay. The solenoid of the brake
release valve is energized to disengage the
parking brakes (negative brakes) (11).
Parking brake switch set to position PARK-
ING:
• Pushing down on the brake pedal opens foot
brake switch (7) to deenergize brake relay
(8). Even if, at this time, parking brake switch
(9) is in the RELEASE position, terminal 3
remains disconnected with terminal 5, for
brake relay (8) remains deenergized.
Solenoid (10) remains deenergized. Brake is
applied.
• Setting parking brake switch (9) to the PARK-
ING position disconnects terminal 1 from ter-
minal 3. Solenoid (10) is deenergized. At the
same time, terminal connects with terminal 5
to light brake lamp on the combination meter.