The procedure below applies to the most recent 4-pin brake light switches with the following part#s - 1J0 945 511 B, 1J0 945 511 C and 1J0 945 511 D (the most recent version - if you buy a new switch it will almost certainly be the ‘D’ version since it supercedes all previous versions). If you have an older style of brake light switch with part# 1J0 945 511 A, then the special installation procedure given below does not apply. See the procedure given at the very end of this DIY for installing this switch. Introduction, Installing the switch : Before attempting to install a new brake light switch, first make sure that the switch is in its unlocked state (as described above) AND the plunger is fully extended (approx. 1?). The bracket that holds the brake light switch is indicated by the yellow arrow in the picture below. Note that the hole in the bracket is not symmetrical and as a result, the switch can only be inserted one way. Push down the brake pedal as far as it will go. If it does not go down enough, start the car temporarily to loosen the brake pedal and then turn the car off. As always, do this procedure at your own risk. I am not responsible for any mistakes in the above procedure or those that you make while performing it.
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