It is a 305 TPI.

I noticed that when in neutral and i press the brakes rpm moves by like 100 rpm and then returns to normal when i release....

what can it be? normal?

thanks

sam

I doubt that these cars have hydroboost, so I'd imagine that it is probally normal. My truck did the same until I switched to hydroboost.

Good way to test for a vac leak in your booster -- Start the engine, let it idle for a couple of minutes, then shut it off. Wait another couple of minutes, then pull the vaccum hose that goes to the booster off, it should suck a whole bunch of air in. If so, you don't have a leak on the booster, then the only other place it could be leaking would be somewhere on the hose.

If it doesn't have any vaccum in it when you pull the hose, check the check valve before you point fingers at the booster, you should be able to suck air through it one way, but not the other.

Hey,

Thanks for the reply, sorry for my delay in thanking you Turns out as you said. Most probably normal.

Sam