i changed the master cylinder today and bled the brake lines no air was coming out while bleeding the brake pedal was firm after we bled it but if it left it alone for a min it would go alomost to the floor. the brakes work fine but u have to push the pedal almost all the way to the floor for the brakes to catch. any ideas on what i should do?

 

Did you bleed for a while at all wheels? The lines are quite long, and it will take a number of pumps to get all the air out.

Although, I'm a bit confused... the pedal sinks on it's own/slowly drops? In that case, sounds like a leak (possibly in the master cylinder).

 

i bled them for awhile the bake pedal only goes down when u press it but it stays at the normal postion

 

If you press it with a constant pressure, does it drop slowly? Or stay still?

 

Mine did that as well a couple of years ago so i repalced the master cylinder, with no change.Everytime i replace the front pads it still does it, it goes away after a very short time.I have no idea why, but i have bled the whole system at least three times, 3litres of fluid, with no change. I just know that it is going to happen and pay attention.

 

If it goes away, maybe one of the pads wasn't set properly... Press the brake pedal hard a lot of times, let it sink, etc., to fill the calipers (push them back out.

 

it stays the same every time you have to push the pedal all the way to floor for the brakes to work

 

You might want to have your brakes power bled. For some reason this system seems to hang onto air bubbles.

 

Yes it does....I had a heck of a time with mine. What I did with the fronts is that I left the old brake pad in place (the one on the piston side obviously), put a big c clamp on the brake pad/new caliper. I then opened the bleeder and cranked down on the c clamp. This will help get most of the air out of the caliper itself. Seemed to work for me.

Geico, how did you make out with yours? Take a look here for the pic and procedure you were looking for (I know it says fuel pressure - take a look anyway):

https://www.dieseltruckresource.com/...=fuel+pressure