Topic: When compressed air ain't enough..

[754]

I think the MC will go way higher than that. Terry if you pump repeatedly, and dont blow up any seal it will make more pressure.
Had to do it on a master cylinder, think it was coming out the feed hole.
You know those grotty rear MC,s on the F model.. The ones where the snapring and washer are a rusted together blob......them ones.

[scottly]

Terry, go stand in the corner. The OP used his MC with a minor leak to pump the piston out.

[Terry in Australia]

Oh no, I'm getting the "Pete treatment"! Come back Pete, I'm no good at confrontations!

[scottly]

I've had my '72 Honda XL250 cafe' in long term storage for the past six years.

That is a sweet looking bike, but I would think it's more of a late '60s TT style than cafe. The hump seats were called TT seats back in the days before Carpy.

[RAFster122s]

Doesn't WD40 have silicone in it?  That could contaminate your brake fluid, DOT 3 or 4 do not like silicone.  But, whatever works for you...

Another trick with stuck rusty fastener, etc.  If you can immerse it in a pan you can melt paraffin wax (the kind used with canning - Gulf is one brand) Use a double boiler and recommend you do it outside on a grill.  The wax is dangerous as it can give you a severe burn and water in the wax pot can cause the wax to splash out.  By double burner you boil water and use the steam to melt the wax you cut up into strips so it can melt easier.  More surface area is why you cut it into pieces.  "Boil" the part in the hot liquid wax for about 30 minutes.  Don't boil your water away...
The wax will wick its way into the rusty parts and usually it will allow the parts to unscrew or be separated if a sliding fit.  Just let it cool enough to handle with heavy padded gloves or with tongs to move it to a vice or other fixture to unscrew or push it apart.  It works when penetrating oil and heat don't get it done.  The wax also tends to leave a light film making it to unscrew of be separated.
You can use other objects in the pot to take up more space so it does not require as much wax.

David

[Terry in Australia]

Doesn't WD40 have silicone in it?  That could contaminate your brake fluid, DOT 3 or 4 do not like silicone.  But, whatever works for you...

You better come and stand in the dummkopf corner with me mate, because, according to the WD40 website, "While the ingredients in WD-40® Multi-Use Product are secret, we can tell you what it does NOT contain. WD-40® Multi-Use Product does not contain silicone, kerosene, water, graphite, or chlorofluorocarbons (CFCs)."

https://wd40.com/faqs

See, the internet makes you smarter..........

[Lostboy Steve]

Doesn't WD40 have silicone in it?  That could contaminate your brake fluid, DOT 3 or 4 do not like silicone.  But, whatever works for you...

Another trick with stuck rusty fastener, etc.  If you can immerse it in a pan you can melt paraffin wax (the kind used with canning - Gulf is one brand) Use a double boiler and recommend you do it outside on a grill.  The wax is dangerous as it can give you a severe burn and water in the wax pot can cause the wax to splash out.  By double burner you boil water and use the steam to melt the wax you cut up into strips so it can melt easier.  More surface area is why you cut it into pieces.  "Boil" the part in the hot liquid wax for about 30 minutes.  Don't boil your water away...
The wax will wick its way into the rusty parts and usually it will allow the parts to unscrew or be separated if a sliding fit.  Just let it cool enough to handle with heavy padded gloves or with tongs to move it to a vice or other fixture to unscrew or push it apart.  It works when penetrating oil and heat don't get it done.  The wax also tends to leave a light film making it to unscrew of be separated.
You can use other objects in the pot to take up more space so it does not require as much wax.

David

Yes, I just learned this trick the other day. Very cool.


Sent from my iPhone using Tapatalk

[Jimray23]

Back when i use to trap for fur, we put the wax straight in the pot of water; brought it to a boil and put the trap in. That way it still penetrated the the springs and jaws but left less build up

--------------------------------------------------
Jim
1979 kz1000b ltd
    stage 3 cams
    pod air filters
    4-1 open exhaust(no muffler)
    full rewire
    dyna-s ignition
    dyna 3 ohm coils

[nvr2old]

Terry, go stand in the corner. The OP used his MC with a minor leak to pump the piston out.

Actually the leaking mc wouldn't originally push the piston and pad out.  I swapped a new one in place with the combination of penetrating oil to finally get it move.

Thanks also for the kind words on the bike.  It was a totally thrashed and stripped down woods bike that a friend gave me, free.  Everything was in need of repair, except the engine which had been bored out to a 305cc with a mild cam.  It ran great, looked like hell.  I originally had it set up as a retro motard with a thicker seat and motocross bars.  Rode it that way for a couple of years before changing it to more of a cafe' style.  The tail piece is either loved or reviled by people, but it was a ton of work to make it fit, so I'll keep it. 

[Terry in Australia]

See that's what I thought you meant mate, before Scott sent me to the corner! Free at last, free at last!

[754]

How fast can the 305 go ? I got a XL 410 cc.
 My buddy has a XXL , its 480 cc....

[Terry in Australia]

You'd need a XXXXXL wouldn't you Frank?

[nvr2old]

How fast can the 305 go ? I got a XL 410 cc.
 My buddy has a XXL , its 480 cc....

According to the CB550 speedo, it hits..80-85mph.  It's sweet spot is 65, though.  It'll run down the freeway, but it's such a small bike it feels scary to be surrounded by cars on it.  It handles great on back road twisties which is pretty much where it belongs.

[Terry in Australia]

They're great fun, I've got a 1983 XR500R with 41 BHP. It'll easily do the ton, and it doesn't weigh much more than me!

[SKTP]

Why not just pump it out with brake fluid?

[TwoTired]

Why not just pump it out with brake fluid?

Shade tree actions rule.

What are you? Vulcan?  That is simply too logical for earthlings.

[ekpent]

Why not just pump it out with brake fluid?

Shade tree actions rule.

What are you? Vulcan?  That is simply too logical for earthlings.

If the master cylinder is working. Sometimes as we all know when work begins for restore on an old abandoned bike that has sat for years most anything with fluid such as brakes are going to be in sad shape and need a rebuild or major attention. I use the master and fluid to remove the pads/pistons on roadworthy machines whenever possible but it is not always a quick and easy available option to break down an old caliper for resto prep on certain project examples.

[Terry in Australia]

Yep, this whole thread started because the OP couldn't pump it out with his leaking MC.......

[TwoTired]

Well he wasn't going to use his rebuilt caliper with the leaking mc, was he?  So overhaul the mc first.  Then pump out the caliper piston with the now non- leaking mc.
No air cannons or grease glob fittings required.  I wonder if there is a Jeff Foxworthy joke in there somewhere?

Cheers,

[754]

I have two grease adaptors.. I use them on the bench..bike would likely be outside somewhere.
Or a cusomer brought in the caliper, or I found it in a box somewhere, or laying in the dirt at the boneyard..
Not worth blowing out an aging caliper to me, to find out.. I have seen them heal up , but not by running at max pressure..
 If anyone needs stock mc cores, i have lots,. Would like to sell quantity..

[Terry in Australia]

Yep, it must be wonderful to live in a perfect world........ 

[jonda500]

Sounds like some members may be lacking in their hoarding skills - I have 5 spare masters & four of them are still able to pump fluid, so I have never needed to fill any of my callipers with grease

[754]

Cheaper to replace a 12.00 grease gun, than have to buy an Mc kit..
 Oh wait, the grease gun hasnt broke.

I have lost sales due to removing stuck pistons to find out they are bad....better though than selling a shipoing one that they have trouble getting apart, only to find out its not useable..
 But that was just part of the service I provide.

[scottly]

Then there is the sensual elation of writhing about in grease, not to be confused with Greece.  Which is a quite different experience.  Who doesn't enjoy a good mud wrestling bout, eh?  Even a mini encounter is so ... Ooo....ahh slippery.  Got to be womanly bits in here somewhere nostalgia.  And then in the afterglow, there is the heady, intoxicating aromas of cleaning solvents AND grease while visiting the disposal pit.  Ahh good times.


Posted for your humorous enjoyment.
Cheers,

Lloyd, you have a sick mind..

[seanbarney41]

personally would much rather writhe about in grease than brake fluid...so don't try to tell me there is anything "neat" or "clean" about brake fluid splashing all over the place.  Brake fluid gives me the creeps and the less I have to touch it, the happier I am.