Why is it ...

[cab93]

That the idle speed will increase up to 700 RPM's if I pump the brake pedal fast, while the car is idling? Does this indicate a fault? Do all MK1's do this?

Help appreciated!

Thanks

Michael

[ontarv]

you will find most cars will do this
your stealing vacuum from the engine
because the brake booster uses the vacuum
so the more you pump it the more it uses and the
loss of vacuum will change the idle

[cab93]

you will find most cars will do this
your stealing vacuum from the engine
because the brake booster uses the vacuum
so the more you pump it the more it uses and the
loss of vacuum will change the idle

Thank you, that the sort of answer that I wanted! (No fault and no $$ to be spent.)

Michael