brakes causing rpm to rise. some air noise
 

my brakes went out i guess and all I hear is air from under the dash andrpm rises. Its my first time posting. I love the info I get from this site. thanks

Re:brakes causing rpm to rise. some air noise
 

did u check yer brake lines and fluid level?

Re:brakes causing rpm to rise. some air noise
 

check the brake booster vac line and it's valve, then check the booster itself.

you've got a vac leak somewhere (air + rpm rise)

Re:brakes causing rpm to rise. some air noise
 

My fluid is fine. From where do you check the brake lines from. Are they the thin metal rods conected to the master cylinder. I checked the hose fom the intake manifold to the brake booster and it was still conected. Didnt fll no air coming out of it. The valve on there I dont no how to check, and what would i be looking for.

Re:brakes causing rpm to rise. some air noise
 

How do you check the booster?

Re:brakes causing rpm to rise. some air noise
 

If I have to change the brake booster, what size booster do I need? the auto shop is saying there are a few different sizes. Would I need a new master cylinder. The car is a 1990 honda civic si hatch with a single cam zc black top, if that matters.

thanks for responding.

Re:brakes causing rpm to rise. some air noise
 

see attached file.

Re:brakes causing rpm to rise. some air noise
 

have u hear of uesing a vacuum on the booster beffor puting it back in.on my manual it says a vacum of 20 in-Hg to the booster.whats a vacuum and where can i get it?

Re:brakes causing rpm to rise. some air noise
 

I also read that I have to adjust the push rod in the booster with the Master cylinder piston, Can anyone tell me what to do. Those are the only two things that Iam stuck on. :'(

Re:brakes causing rpm to rise. some air noise
 

if you find out how install it let me know i have a friend with the same problem