Function Vacuum Control

Identification Of Vacuum Lines

The basic color of the vacuum lines for the automatic transmission is black. The lines are identified for the different functions by means of color stripes.

Abbreviated designations in vacuum flow charts:

br = brown
gn = green
rt = red
sw = black
ws = white

Vacuum Flow Chart

Vacuum Flow Chart Model 123 Standard Version:

Models 123.133, 123.153, 123.193, 126.120

The vacuum is picked up at vacuum line (a) pump/brake unit. It is fed to the vacuum control valve (65) through the black/green vacuum line and throttle (63). The vacuum control valve controls the vacuum in idle throttle position to approx. 0.35 bar.

Upon further acceleration the vacuum is still further reduced by the vacuum control valve (65) and is completely exhausted at full load.

On this version moving off in 1st gear is not initiated by the vacuum but by the control pressure cable.