someone help

I was changing my brakes today and while i had my front caliper off i mistakenly pressed the brake pedal and the brake piston extenden to far out for me to get the calliper back on.

I tried to press it back in so that i could slide the calliper back on but its no going in.

Anyone know how i could reset the piston so that its not as far out. so that i could get the calliper back on.

This car that i was changing the brakes on is a s13 1990 180sx

use a c clamp and slowly press it back in.

yeah put one brake pad against the piston and use a C-clamp to press it in

if you have to really torque the c clamp hard to get it in then your caliper is probably siezed up in there

someone told me about using a bleeder valve but i don't know where it is and how to open it.

can someone tell me where it is for a 1990 180sx

no that wont help
the bleeder valve is the little thing sticking out of the back of the caliper and if you loosen it your brake fluid will all drain out when you press the brake pedal, or youll get air in the line when you push the piston back in, which is just as bad

use a C clamp its the only way
they do sell a brake pad spreader tool also but the c clamp works fine

i used the bleeder valve and it work the C-clamp didn't work.

But the only problem now is i have air in my line just like you said would happen.

My question now is how to get the air out and is it difficult to do.
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Also because i was working on only one brake does that mean that i only have to bleed that one to get the air out or will i have to bleed all.

When i push the brake pedal in now it goes right down easy and the brakes didn't even slow the car down but when i pump the brakes it barley activated the brakes so little that i had to pull up the emergancy brakes to stop

Might as well put in some good fluid and stainless steel lines now since you have to bleed to system. You can get speed bleeders to do it alone, or you have to get a friend.

http://www.valvoline.com/carcare/articleviewer.asp?section=hm&pg=ccr20011001bb

yeah, you have no brake pressure now because of the air in the lines. to bleed them, have a friend help.

you need
-a small clear hose that fits on the valve
-a bucket to drain the fluid into
-a lot of brake fluid

alright, so put your wrench on the bleeder, then put the hose on. loosten the screw a little bit, and have the friend push in the brake pedal. once the pedal is almost all the way in, tighten the bleeder so no more air gets in when the friend lets the pedal back out.

so, loosten, pedal in, tighten, pedal out, etc

do that to all four corners i beleive.
make sure you check the brake fluid resevoir so the fluid doesnt go down too far, ya do that and its pointless to bleed them at all.

next, invest in a very good shop manual. haynes, chilton,. it will save you a lot of trouble. will also help you learn a lot about your new car.

need any help, let me know

if the piston was too hard to push in with a c clamp then the piston was seized up and you need new calipers my friend

i pushed it in easily with my finger when i released the pressure in the brake lines so i boudt that its seized up

You changed your pads so if you just had to pump the pedal up after you first did it thats just the fluid building back up in the caliper you drained and then pushing the pads back out to the rotor. I also doubt you let got much air into the caliper you did drain.