80-84, plain cap with no fluid level switch.

85-91, cap with fluid switch, turn on dash brake warning light when low

This difference combines with some other wiring differences.

80-84 brake pressure switches have 3 wires, to also trigger dash brake
warning light when pressures don't match

85-91 brake pressure switches have only 2 wires, just for the rear brake
lights

Mark

Old Volks Home wrote:
> Some Vanagons have a fluid sensor built into the cap, which connects
> to the Brake Warning Light to indicate low fluid.  But the
> installation of this cap is inconsistent as most Vanagons I've
> encountered have just the standard cap (trivia:  standard cap is also
> used on 3/55-67 Buses, all 914s, lotsa early watercooled inline 4
> models, etc.).  Both my Vanagons and 914 just have the standard cap,
> no warning harness to be found.  Just find a standard cap (211611351B,
> 191611349A or Porsche 477611361) and install it.  You can bet the
> Porsche numbered cap is probably offered at a "Porsche" price, even
> though it's the same thing.
>
>