Powermaster rebuild

[fc227]

If I asked this Question already I am sorry. In the Power Piston assembly , How does one get the inner control valve out? I am not talking about the valve seat at the very bottom. I am referring to the rod that has a flange in the middle of it and has a small "O" ring on the bottom.

 

[BEATAV8]

That one should just come right out with a tug

 

[fc227]

That one should just come right out with a tug

What do I tug with ?, So I do not mess up the face sealing area. I can't get my chubby little fingers in there

 

[BEATAV8]

I hope I'm thinking of the same part. A pair of needle nose pliers... It should slide out very easily with very little effort

 

[BEATAV8]

This piece?

 

[fc227]

This piece?

Yep, that's it. I am just worried about tearing up the face of it.

On the unit I tired to rebuild last week that has no power assist now. that part would not budge.

 

[BEATAV8]

It should move easily. That's probably why the other one wouldn't work right.

 

[fc227]

Agreed, Thank you very much for your help ! I do appreciate it.

It is probability plugged. I notice it has a little feed though hole ?

 

[BEATAV8]

Maybe some rust or something making it stuck?

 

[daturbosix]

didnt read this whole thread, but anyone know people buying cores? i have 4 complete units that may work and are ugly or are inop..
might even be interested in getting them rebuilt now that i think about it.

 

[fc227]

Yep, it popped right out. (This is the original PM from the car, this one the brakes where dragging and slow release when cold) . The other PM that I got used , I tugged on that sucker and it did not move. You are right that has to be what is wrong with that unit.

But back to this one . There is rust on the bottom below the "O" ring how do I clean that (and inside where that sits)

 

[fc227]

Why is there "O" ring on that piece ? I don't see anything behind it , Unless it just holds it in place???

 

[BEATAV8]

That O ring is sealing brake fluid from leaking into the car and onto your carpeting. The kirban kit has that o ring included so you can replace it.

Try cleaning the rust with wire brushes.

 

[fc227]

Oh, that is not sealed off behind there? Should /do I also need to remove the pedal rod receiver , that is real rusty

 

[BEATAV8]

I've never been able to remove the pedal rod receiver but I never really went after it to get it out. If its rusty you should go after it. Get that little retainer clip out and the retainer should come out

 

[BEATAV8]

Remember not to use any petroleum when your cleaning the rust. Any oil near brake seals will ruin the seal rubber.

 

[BEATAV8]

Since the larger parts are aluminum, their bore ID's should clean easily and still have a good surface finish for the O ring.

 

[fc227]

Thank you , I believe the term for that part is the "slug"

 

[fc227]

I think I am going to leave the Slug alone. It in there tight & rusted, but it does receive the push rod so.............

 

[BEATAV8]

I think the slug might have to be freed up? I know it can slide back and forth in there a little bit