changed a brake switch in a 2000 vw jetta and now the brake lights wont go off. does the same thing when i?

Question

reinstall old switch

does this have something to do with the computer having to be reset maybe?

good answer magik very helpful thanks

Answer 1

Here are the installation directions quoted from the factory manual and from alldata.com
Start Quote."
Brake light switch, removing and installing/adjusting

Two different styles of brake light switch were used in production. For servicing purposes they will be referred to here as "old style" and "new style".

It is important to identify which style of switch is installed prior to servicing as each requires specific removal and installation/replacement procedures.

Notes: On Diesel models and gasoline models with cruise control, Brake Switch -F- and Brake Pedal Switch (cruise control DFI) -F47- are integrated. The following procedures apply to all models regardless of switch.
Only "old style" switches can be removed and reinstalled/adjusted.
"New style" switches must NOT be reused after removal. Always replace.
CAUTION: Should a brake light switch require replacement, only a specific "new style" switch is available (supercedes all previous part number versions). This switch requires that critical procedures be followed prior to and during installation.

Preparation

* Remove driver's side lower instrument panel cover.
* Disconnect electrical connector from brake light switch.
* Identify style of switch installed: "Old style" switch is identified by large (approximately 10 mm) plunger tip button, and square plunger shaft. Removing and installing/adjusting below.

"New style" switch is identified by small (approximately 4 mm) plunger tip without button, and round plunger shaft.

"Old style" brake light switch, removing and installing/adjusting

Note: The following applies only to an existing, functional "old style" switch that is removed and reinstalled/adjusted.

Removing




* Turn switch counter-clockwise 90°
* Pull switch out from retainer mounting hole.

Installing/adjusting

* Before installing, pull out plunger completely.
* Depress and hold brake pedal in down position.
* Note orientation of retainer tabs on switch and carefully insert switch into retainer mounting hole




* Secure switch by turning clockwise 90°
* Slowly release brake pedal to stop.

Note: The above action automatically adjusts the switch plunger travel.

* Reconnect electrical connector to switch.
* Check function of brake light switch.

"New style" brake light switch, removing and installing

Note: The following applies only to a "new style" switch that is removed and replaced.

Removing




* Turn switch counter-clockwise 45°
* Pull switch out from retainer mounting hole.
* Dispose of switch accordingly.

CAUTION: "New style" switches must NOT be reused after removal. Always replace.

Installing

CAUTION: "New style" switches have an internal switch mechanism that will be damaged if not installed and adjusted according to the following procedure.
DO NOT depress switch plunger or otherwise rotate the retaining collar of the switch prior to installation.
Brake pedal must be held in the up position (not depressed during switch installation.




* Before installing, pull out plunger -arrow- completely.
* Hold brake pedal in up position (against stop).
* Note orientation of retainer tabs -1- and -2- on switch and carefully insert switch into retainer mounting hole.
* Push switch in and seat fully into opening (pressing plunger against brake pedal to adjust).




* Once seated, secure switch by turning clockwise 45° .

Note: The above action turns the plunger shoe into the correct orientation to make electrical contacts in switch operate, as well as locks in the plunger adjustment against the brake pedal.
CAUTION: When installing, switch must be rotated until it is fully locked and the electrical connector is in the horizontal position. Inspect to ensure internal stop pin on retaining collar is fully seated against outer shell.

* Reconnect electrical connector to switch.
* Check function of brake light switch. " End Quote
"

Answer 2

is this the switch that makes contact with the brake arm (mechanical switch)? If so, the free play of the arm to the switch has to be adjusted (back off the front set nut and tighten the rear set nut or tighten the return sring on the pedal arm). If it is the electronic switch, the switch is faulty and you need to replace it. Do not reset the computer until you have the car working properly and have time to go for a drive for about an hour and a half. Once you reset the computer, you loose all the drivability paramiters and they have to be corrected by going for a long drive (city and hiway driving)

Answer 3

Vw Light Switch

Answer 4

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Answer 5

You have to adjust the position of the switch so it is depressed when the brake pedal is in the resting position, when you press the pedal for brakes it connects the ground to turn the lights on and when you let the pressure off of the pedal it breaks the ground to turn off the brake lights so make sure that you position the switch so it breaks the ground when you have your foot off of the pedal.

Answer 6

Brake switch is not set correctly.

Answer 7

switch is not secure or you are not grounded properly.