I have replaced all vacuum lines and checked the black box. The car is vac'n at 9psi which causes a big problem with the brakes. Does anyone have any tips? i changed almost everything, idle control valve, clamped all vacuum lines,pvc, made sure secondary's stayed closed .. I not sure but could the secondary screws after the throtle bodies been fuxx with changing or loss of vacuum. Help is greatly needed thanks..

the black box behind the intake has a line that heads straight up, if that's not connected to the brakes vaccum then it won't work properly.

the black box behind the intake has a line that heads straight up, if that's not connected to the brakes vaccum then it won't work properly.

Are you talking about a port on top of the black box? The issue that im having is that the whole motor is vaccing a 9 psi which is cause a loss braking. Normal gtir's have vacuum at 15-19psi depending on cams and porting. I have alittle of both but i should not see to much of a difference vac drop.

sounds like you know enough, but where do you have all the line connect to go through them one by one, and list them just to make sure there all in the right connection. starting out where do you have the one under the tps, then the one under the intake inlet, then the three off the black box.

check for um.....leaks?

well it seems that he replaced all the lines, so he shouldn't have leaks, its more likely that something is backwards.

^yea or going to the wrong spot..ill come down and fix it kev

do u have the one way valve install to the brake booster?

that was the first question i ask!

Ah nope. U asked if the line was connected champ. Inside the origanal line about an inch from the boster is a one way check valve. If he has replaced the line and not fitted this he will have dramas