Cruise control on 2000 ford explorer change the pressure switch on master cylinder and it still does not go on

The pressure switch on the master cylinder has nothing to do with the cruise control . The pressure switch as you call it is not a pressure switch at all . Brake fluid level sensor . The brake switch is under the dash on top of the brake pedal linkage (arm) .
Speed Control The vehicle speed control consists of the following components:

• speed control servo (9C735)
• speed control actuator cable (9A825)
• speed control indicator lamp
• speed control actuator switches (9D743)
• brake pedal position (BPP) switch (13480)
• deactivator switch
• anti-lock brake control module (2C018)
• clutch pedal position (CPP) switch
• Self-Test Diagnostics
  WARNING: This test is a key on engine off (KOEO) test only that is conducted in PARK only with parking brake fully engaged.
  
  • Enter Self-Test Diagnostics by depressing the speed control OFF switch while turning the ignition key ON, making sure the engine does not start and is not running. The speed control indicator lamp on the instrument panel will flash once to indicate that the speed control module entered the diagnostic mode.
  NOTE: Five additional flashes at this point indicate a defective speed control servo. Release the OFF switch.
  
  • Release the OFF switch.
  • NOTE: If the ON switch is not pressed within five seconds after entering the diagnostic mode, the module times out and the procedure must be started over.
    Press the remaining switches in this sequence: ON, RSM (resume), CST (coast), and SET/ACCEL. The speed control indicator lamp will flash as each switch is pressed. Press each switch in the sequence immediately after the light goes out for the previous switch.
  • A lamp flash with the last button (SET/ACCEL) indicates that the STATIC test passed. If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective. If the lamp does not flash with the last button, and additional flashes occur, follow the chart below for trouble codes:
    • Two flashes - Brake pedal position (BPP) switch is defective, circuit is defective, or brake pedal is applied; clutch pedal position (CPP) switch is defective, circuit is defective, or clutch pedal is applied.
    • Three flashes - Brake deactivation switch is open or circuit is defective.
    • Four flashes - Vehicle speed signal is out of range or circuit is defective.
  • Immediately after the static test has passed, the speed servo will then carry out a dynamic test automatically by actuating the throttle lever from 1mm to 10 mm of travel from the idle position. During the dynamic throttle pull, observe the throttle movement to witness any binding or sticking of actuator cable, correct connection of actuator cable to throttle lever, and make sure the throttle returns back to idle position. If incorrect connection and/or binding or sticking of actuator is observed, go to the Symptom Chart. If dynamic pull at the throttle body is observed, Go To Pinpoint Test A .
  • Return the ignition switch to the OFF position and proceed to the Symptom Chart.
  Symptom Chart

• Flash code 1 - system pass

• -

• System Pass.

• Flash code 1 - no dynamic pull at throttle body

• Speed control actuator cable.
• Speed control servo.

• GO to Pinpoint Test A .

• Flash code 1 - speed control inoperative

• Circuitry.
• Speed control servo.

• GO to Pinpoint Test D .

• Flash code 2 - BBP switch circuit failure

• Circuitry.
• BPP switch.
• CPP switch or jumper.
• Speed control servo.

• GO to Pinpoint Test B .

• Flash code 3 - deactivator switch

• CJB Fuse 13 (20A).
• Circuitry.
• Deactivator switch.
• Speed control servo.

• GO to Pinpoint Test C .

• Flash code 4 - speed signal circuit failure

• Circuitry.
• Speed control servo.
• Anti-lock brake control module.

• GO to Pinpoint Test D .

• Flash code 5

• Speed control servo.

• INSTALL a new speed control servo. REFER to Actuator - Speed Control Servo . TEST the system for normal operation.

• The speed control is inoperative - no flash codes

• CJB Fuse 10 (7.5A).
• Circuitry.
• BPP switch.
• Speed control actuator switches (9D743).
• Anti-lock brake control module.
• Speed control servo.

• GO to Pinpoint Test E .

• The speed control does not disengage when the clutch is applied

• BPP switch.
• CPP switch (M/T).
• Circuitry.

• GO to Pinpoint Test F .

• The speed control switch is inoperative - COAST

• Speed control actuator switch.
• Speed control servo.

• GO to Pinpoint Test G .

• The speed control switch is inoperative - SET/ACCEL

• Speed control actuator switches.
• Speed control servo.

• GO to Pinpoint Test H .

• The speed control switch is inoperative - RESUME

• Speed control actuator switch.
• Speed control servo.

• GO to Pinpoint Test J .

• The speed control switch is inoperative - OFF

• Speed control actuator switch.
• Speed control servo.

• GO to Pinpoint Test K .

• The speed control indicator lamp is always on

• Circuitry.
• Speed control servo.
• Instrument cluster.

• GO to Pinpoint Test L .

• The speed control indicator is inoperative

• Circuitry.
• Bulb.
• Instrument cluster.
• Speed control servo.

• REFER to Section 413-01 .

• The set speed fluctuates

• Anti-lock brake control module.
• Speed control servo.
• Speed control actuator switch.
• Circuitry.
• Speed control actuator cable.

• GO to Pinpoint Test M .

• Engine (6007).

• REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual. REPAIR engine as necessary.