K5 almost killed me brakes to the floor

[75gmck25]

If the linkage is all intact, my best (somewhat educated) guess is that the piston seal inside the master cylinder has torn or otherwise failed. However, the pedal will usually still return up, so check the external mechanical linkage and the rod first.

 

[Ricko1966]

I’m generally not looking to changes things for the sake of changing them BUT after yesterday I need to be confident that I have brakes I’ll buy gold brake lines if in my head they will help me stop

do you know what this is? It’s on the vaccume line before the booster check. Is kind of oily so maybe it’s in there to keep oil out of the booster?

I’m trying to decipher what the last guy did. Some things look solid others I’m suspect of. This one I don’t know

Those are original brake booster hose fitting and check valve,maybe,maybe not for your year and engine I don't have all memorized. But those will not create a problem for you.

 

[BryanS]

Those are original brake booster hose fitting and check valve,maybe,maybe not for your year and engine I don't have all memorized. But those will not create a problem for you.

Thanks. It just looked weird to me. I think I have a vacuum problem as the low idle is pretty loopy like it had a huge cam. Does Mean anything the black check valve was a little oily?

Got my new MC installed and going to bleed everything now

Really appreciate your help

 

[Ricko1966]

Thanks. It just looked weird to me. I think I have a vacuum problem as the low idle is pretty loopy like it had a huge cam. Does Mean anything the black check valve was a little oily?

Got my new MC installed and going to bleed everything now

Really appreciate your help

If you are 2 man bleeding it go real slow,don't pump the pedal, you may or may not blow the combination valve off center,watch your brake light. If it comes on the shuttle is off center and you probably will not be successful bleeding the brakes. Unless you have a bypass pin you can depress it,pull it,depending on year and model or a centering tool. Post back if you have problems. I can walk you through making the tools.

 

[BryanS]

If you are 2 man bleeding it go real slow,don't pump the pedal, you may or may not blow the combination valve off center,watch your brake light. If it comes on the shuttle is off center and you probably will not be successful bleeding the brakes. Unless you have a bypass pin you can depress it oull,depending on year and model or a centering tool. Post back if you have problems. I can walk you through making the tools.

Well….i was going to start bleeding and went to passenger rear and there is fluid leaking out of the drum. Did not see that yesterday.

 

[HotWheelsBurban]

Well….i was going to start bleeding and went to passenger rear and there is fluid leaking out of the drum. Did not see that yesterday.

Probably a bad wheel cylinder, had to get them replaced on my Crew Cab last fall. I could have done it but not in the timeframe we had before a gig, so I paid a shop to fix it while I was at work.