Gear change

[Hawks]

Replaced brake switch yesterday ,when I drove car it would not change up to 5th and 6th it seem to rev higher before changing as well,if I use manual it will go into higher gears ,on the switch there is a mauve part that moves what does it do and what position should it be in when it is in the bracket

[Steve Q]

Might be worth doing a diagnostic check. 

Could the part you've fitted be defective.