Rev increasing when brakepedal is pushed

[pablo_o2]

As the titel explains, after I reinstalled my overhauled head I also installed a 123-ignition.
I had some issues with the finetuning and finally a broken sparkplug lead seemed causing all the problems.
Now everything works fine apart from the strange effect that when I push my brakepedal my revs increase with about 700 rpm.
Any ideas what the reason might be? It's a mistery to me 

Regards

[star63]

Your brake booster is leaking. The engine gets more air when you press the pedal. It may be the membrane but more likely it leaks through the saft/valve seals inside the booster.

- Petri

[kampala]

Agree with Star63.  Usually it is the brake booster.  I had the same issue.  You will find plenty of info within the forum on how to test the hose, check-valve etc.  

The company that rebuilt my booster also advised that sometimes it's only the gasket between the master cylinder and the booster so check that as well before committing to a replacement booster.  

With that much rise in RPM you should feel lack of power brakes.  Mine clearly felt like manual brakes when it went out.

[pablo_o2]

Ok that is obvious. Sorry for the late response but I was away for the week-end. Thanks for the answer

[Peter van Es]

He forgot to add he was away for a Pagoda weekend... An his car looks great and will drive great when he sorts this little issue.

Paul... See you next time! It was fun

Peter & Karin

(Some photo's on the Google Group... See messages at the top of the page)