Date:         Fri, 9 Oct 2015 14:12:28 -0700
Reply-To:     vw_van_fan_Mark <madvws@COX.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         vw_van_fan_Mark <madvws@COX.NET>
Subject:      Re: Help me diagnose and fix no brake lights
In-Reply-To:  <56182BFA.3020408@turbovans.com>
Content-Type: text/plain; charset=UTF-8; format=flowed

Only 80-84 vans have the brake failure warning setup. These use 3 wire
switches to supply the signals to the dash warning module and the rear
brake lights. 85-91 vans use 2 wire switches, only for the rear brake
lights.

For some reason new switch quality seems low and the supply of new 2
wire switches is even lower.

Mark


SDF ( aka ;jim lahey' - Scott ) wrote:
> re this brake warning light module K ...
>.................
>
> Obviously the swtiches , one or both I imagine, turn on the brake lights.
> the 'other function ' is for a legally required brake failure warning light
> in this system I'm pretty sure that if there is a significant difference
> in pressures between the two circuits
> ( like say a rear wheel cylinder is leaking badly ) ..
> the two brake light switches tell this info to the module ..
> the module sees 'no pressure in one side' compared to the other
> circuit.   thus turning on the warning light .
>
>