So we got the calipers compressed all the way and was able to install the new pads. When we finished I tried depressing the break pedal and there was very little resistance and then.....none at all.

Checked the fluid and as far as i could tell it was empty. Filled the tank back up and twisted the lid closed. Tried pumping the break again...and still no pressure build up. We could hear air being sucked in around the cap and figured that was why we didnt have any pressure.

Any clue with whats going on? When we remove the cap and press the breaks the sound is gone, but as soon as we twist it back on we hear it again.

Thanks for you thoughts!

 

When you compressed the caliper pistons, did you take the cap off the fluid reservoir?

 

We didn't take the cap off, we opened the bleeder valve on the caliper.

 

Could be air in the lines, or you might have busted the seals on the master cylinder. I would start by bleeding the brakes and checking your master cylinder. The missing fluid has to be going someplace

 

when we topped off the tank it wasn't leaking out anywhere that we could see. I guess I'll have to check it in the morning and see if the level dropped through the night.

How can I tell if the seals are busted?

Could it be something in the cap of the fluid tank? It sounds like it's sucking air through the cap...

 

It might be but that'd be rare. I'm with Chris on this - if the internal seal on the plunger in the master cylinder ruptured, the plunger is moving through the brake fluid rather than moving it. That could be the sound you're hearing. Bleed them and if it doesnt help, and fluid isn't leaking out, start shopping for a new master.

 

damn you Devil.........you were supposed to come up with some creative easy fix....but noooooooo.

but thanks.....is this a DIY??

 

Lol dump some radiator stop-leak in? Kidding of course. I don't see why it wouldn't be a DIY. You'd have to search around for info on it though - I don't recall ever reading about anyone here changing it out, so I don't even know who to tell you to ask for advice other than auditech79.

 

alright....thanks there Devil