1990 240sx SOHC Idle Rough

[tommypaton]

When ever I step on the brake, i hear a ssssssssshhhhhhhhh noise coming from my pedal area. It also shakes and shimmys when I press on the brakes sitting at a stop light. I have been told I could a vacuum leak in the brake lines or booster. I have looked but not been able to find anything wrong. Does any one know what it could be and tell me how to fix it?

[destroyyourmind]

sounds like theres air in your master cylinder does the clutch do it too? I have air in mine but all it does is mess with my pressure making it feel like I have little to no clutch. to find out have someone look at your brake fluid to see if it bubbles when your on the clutch/brake

[tommypaton]

It doesnt happen when I step on the clutch. I have a stage 3 clutch and carbon flywheel. Its awesome. Shifts pretty sweet. Pressure is good. Brakes feel really hard to push down though. If someone slammed on their brakes in front of me, I would literally have to stand on my pedal.

[tommypaton]

Hello anyone able to help me?

[RunCool]

You need a new brake booster, or your getting really bad vacuum to the booster