GMC 25524845 Switch Assembly, Stop Lamp & Cruise

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Disconnect the switch's electrical harness. With assistance, depress the brake pedal fully and remove the switch from the clip near the pedal. Replace the old clip in the bracket, insert the new switch until seated, release the pedal to its stop, reconnect the harness, and test the system.

Cruise control maintains a set vehicle speed in normal driving conditions. It mainly uses vacuum to run a throttle servo, overseen by the Cruise Control Module (CCM). Features include cruise, coast, resume/accelerate, and "tap up/down" speed adjustments. Activation typically starts above 25 mph (40 kph). Key components are mode switches, CCM, servo unit, Vehicle Speed Sensor (VSS), vacuum supply, release switches, and harnesses. The system retains vacuum at the set position, with the controller managing three vehicle/system states. Components include the vacuum servo, EMC Controller/Actuator, Electronic Module, and VSS, supplemented by a Vacuum Accumulator for consistent performance.

Take away the brake light switch on models that were made in 1994 and beyond by unplugging the cable from the negative pole of the battery. Then, if necessary take off side knee bolster for a driver. After that undo the retainer holding brake switch and master cylinder push rod to brake pedal. Remove brake light switch and master cylinder push rod from brake pedal, also disconnect electrical connector from switch. Finally pull out the switch out of your automobile. Fit over a slave cylinder pushrod and secure to the pedal using a retaining clip as you install this type of machine on it first. Connect harness electrical connector into it. The rest installation steps are same as removal method but in reverse order. The self-adjusting nature of this kind of switch means there is no need for any adjustment . Check operation of brake lights after fitting,please .

Unplug the electrical harness from the switch.

Unscrew the switch from its mount.

To remove the brake light switch on 1994 and later models, you need to follow these steps: 1. Disconnect the cable from the negative terminal of the battery. 2. If necessary, remove the driver's side knee bolster. 3. Remove the retainer securing the brake switch and master cylinder pushrod to the brake pedal. 4. Detach the brake light switch and master cylinder pushrod from the brake pedal. 5. Disconnect the electrical connector from the switch. 6. Finally, remove the switch from the vehicle.

After installing the new switch, you should connect the wiring and battery, and ensure that the brake lights are working properly.

Insert the switch into its mount from the rear until the switch body is up against the mounting clip.

Reconnect the electrical lead.