Toro 41188, Service Manual

Page: 152 / 353

Multi Pro 1750
Page 5 − 50
Electrical System
Brake Pressure Switch
The brake pressure switch is a normally open switch
used to engage the hill assist (brake lock) feature. The
Toro Electronic Controller (TEC) monitors the operation
of the brake pressure switch as an input and provides an
output to energize the brake lock solenoid when appro-
priate. The brake pressure switch is located below the
operator’s seat in the brake line for the rear brakes
(Fig. 68).
NOTE: To engage the hill assist (brake lock) feature the
clutch pedal and service brake pedal switches must be
open (pedals depressed), the vehicle must not be mov-
ing, and enough pressure must exist in the rear brake
line to close the brake pressure switch.
Testing
1. Park machine on a level surface, stop spray pump,
stop engine and engage parking brake. Remove key
from ignition switch.
2. Raise the operator’s seat and locate the brake pres-
sure switch. Unplug wire harness connector from
switch.
3. With the use of a multimeter (ohms setting), the
brake pressure switch may be tested to determine
whether continuity exists across the terminals for each
switch position. Continuity (zero ohms resistance)
should exist across the switch terminals when the ser-
vice brake pedal is depressed. There should not be con-
tinuity (infinite ohms resistance) across the switch
terminals when the service brake pedal is not de-
pressed.
4. Replace brake pressure switch if testing determines
that it is faulty. Bleed the brake system after switch re-
placement (see Bleeding the Brake System in Chapter
8 − Chassis in this manual).
5. If the brake pressure switch tests correctly and a cir-
cuit problem still exists, check wire harness (see Electri-
cal Schematic and Wire Harness Drawings in Chapter
10 − Electrical Drawings in this manual).
6. Connect the wire harness connector to the brake
pressure switch after testing. Lower and secure the op-
erator’s seat.
1. Battery 2. Brake pressure switch
Figure 68
1
2
Electrical
System