Roadblock!

[mwillika]

Hey guys, figures right as the forum goes down I get more stuck than ever before. I feel like I've exhausted every resource so any help would be awesome

Basically I've got these MCP brake calipers, I took em apart to see why they were acting up, turns out the springs on the adjusters had collapsed.

Bought the new part, but now the outer sleeve of the old adjusters won't come out. It's almost as if its melded itself to the caliper.

I've tried all manner of hitting, heating/cooling, even tried reboring them. But none of the above worked, and I'm really trying to avoid spending the cash for a new caliper. (And more importantly, having to wait a week before its drivable again)

Please save me!!

 

[mwillika]

Pics

 

[J_Walker]

Are the sleeves threaded?

Also, heating only helps break the rust lose, what you want to do actually, if you can. Get a can of compressed air.. Spray it on the inside of the sleeve, while hitting the outside of the caliper with a heat gun. all at the same time. then try twisting them out with like a left handed drill bit, or going from the back [if you can] right handed drill bit.

Cold = shrink
Hot = expand

 

[Doc Sprocket]

I am assuming that since you have the new ones, you can see whether they are threaded or not. I am assuming they are not threaded.

I think I would attempt to use a small pin punch to collapse one wall inward, working the punch down between the sleeve and the bore (being careful not to hurt the bore). Once it has been sufficiently collapsed, it should come out easily.

 

[itsid]

the picture says threaded
still you can try to collapse them inward, but I'd try the heat treat first.
I removed a tapped sleeve with jb weld once.
Mine were through hole, so you should fill in some paper first to make sure JB Weld attaches to nothing but the sleeve (and the paper)
First I scratched the inside with a nail, filled it with JB weld and sticked a big (cheap) Allen key in, let it dry and I could just unscrew it.

'sid

 

[Doc Sprocket]

I did see the threaded hole, wasn't sure if the other was. That's a neat idea, Sid. I would just revert to an extractor if that were the case.

 

[mwillika]

Yea my first attempt to get them out was heating them up with a torch and then quickly cooling them with water, they still wouldnt budge after that though.

I'm gunna see if I can't do what Sid said, I was going to weld something in there but they're aluminum, hadnt thought of jb weld though.

Also, they are threaded, the new ones look like this:
http://www.bmikarts.com/Hydraulic-Caliper-Adjuster-_p_578.html

You cant see it in the pic but originally there was a top to it that you were supposed to be able to unscrew it with, but due to the rust they ended up just breaking off leaving me with the outer cylinder.

Also I tried an extractor, didnt work

 

[Doc Sprocket]

Have you got a good penetrant like Liquid Wrench, PB Blaster, or WD40 you can soak the heck out of it with?

 

[mwillika]

Yea its been soaked in PB blaster for at least three days

 

[itsid]

if you already tried an extractor without success, I wouldn't be too confident on the jb weld thing anymore; especially not if there is any residue of PB blaster on the inside

Good luck anyways

'sid

 

[mwillika]

I cleaned it out and am trying the JB Weld now, I'll know how it turns out tomorrow. If not looks like I'll just have to go ahead and get a new caliper, which is probably for the best in the long run anyway

 

[B man]

Ah the simplicity of a band brake. this is why i dont like hydraulic brakes.