94-r2 - all stock with the exception of a SS down pipe. Car runs great, new LIM gasket-blew it, new exhaust gasket-why not with a new down pipe, new hoses-it is 12 years old, new belts-ground wire replaced-fixed that 3k accel problem. Low 36k miles - Not FS. One odd event recently appeared. On hard breaking to a stop or near the stop the idle drops near the end of the decel to about 5k. It comes up pretty quickly 3-4 seconds to normal idle. It does not stumble or buck or hunt idle it just slowly rises to normal. Hey maybe its normal with age and I am looking for perfection but Again with the AC on this does not happen - as the AC feeds the PCME data and I believe the braking system also feeds it data. Essentially it feels like a vac leak / drop. Engine was just smoked during its annual inspection with no standing idle vaccum issues noted. Have not seen a lot on master cylinder issues but perhaps with age this one is going. tHougts?

 

Could be a problem with the check valve on the master cylinder inlet:

https://www.rx7club.com/showthread.p...ke+vacuum+hose

Worth a check at least.

 

Thanks, will take a look, kind of makes sense as it only occurs as noted. thread link is helpful

 

Let us know what you find. I'm curious as to the cause of your problem.

 

sometimes my radio turns off with hard braking...dont think its related though...hehe
I would love to know what this is....