Parking Brake Switch - Toro Groundsmaster 4500-D Series Service Manual

Parking Brake Switch

Switch Testing
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
g309633
1. RH brake pedal
2. Brake detent
3. Carriage screw
4. Switch plate
5. Brake switch
The parking brake switch is a normally open proximity switch. The parking brake
switch is attached to the bottom of the RH brake pedal
When the parking brake is not applied, the parking brake detent is positioned
near the target end of the parking brake switch so the switch is closed. The
parking brake detent is moved away from the switch when the parking brake is
applied causing the switch to open.
Note: Before disconnecting the parking brake switch for testing, the switch and
its circuit wiring should be tested as a TEC electrical input using the InfoCenter
Display (see InfoCenter Display (page
parking brake switch and circuit wiring are functioning correctly, no further brake
switch testing is necessary. If, however, input testing determines that the brake
switch and circuit wiring are not functioning correctly, proceed with the following
parking brake switch testing procedure.
1. Park machine on a level surface, lower cutting decks, engage parking brake
and stop engine. Remove key from ignition switch.
2. Disconnect wire harness electrical connector from the parking brake switch.
3. Check the continuity of the switch by connecting a multimeter (ohms setting)
across the connector terminals.
4. When the parking brake is released (brake not applied), there should be
continuity (closed) between the switch terminals.
5. When the parking brake pedal is depressed (brake applied), there should not
be continuity (open) between the switch terminals.
Figure 199
6. Lock nut
7. Brake pivot pin
8. LH brake pedal
9. Switch
6–8)). If input testing verifies that the
Page 6–39
(Figure 199).
Electrical System: Component Testing