Master cylinder problem

[GMC]

I just fitted a front wheel back into a bike and had to push the pistons back into the caliper.
In doing so I popped the bloody sight glass out of the master cylinder.
I think it hit outer space during its journey.

Is this something that can be bought as a part and can they be put back in securely or do I need to source another master cylinder?
It was a 96 CR 125

[Mick D]

Least your honest Geoff.

I may have looked over my shoulder, to see if it was seen or not

Then said,

It was like that when I got here,

Tebor, did it.

Factory fault just waiting to happen.

You been running the wrong fluid in it.

So hot from global warming, she just expanded and blew.

Miss alignment of the plannets.

Solar flare.

[smed]

Thats a trap for the unwary GMC,I have been doing that for years & never came across that happening but i guess it makes sense,worn pads,someone has topped up the master cylinder at some stage,a bit of gentle backwards pressure & ka-pow! sight glass goes ballistic! No you cannot buy the glass seperately,i had a look on powersportspro parts for ya,if your lucky it may just pop back in,fingers crossed  

[Mick D]

Thats a trap for the unwary GMC,I have been doing that for years & never came across that happening but i guess it makes sense,worn pads,someone has topped up the master cylinder at some stage,a bit of gentle backwards pressure & ka-pow! sight glass goes ballistic! No you cannot buy the glass seperately,i had a look on powersportspro parts for ya,if your lucky it may just pop back in,fingers crossed  

First he has to find it

It was last seen on it's way into orbid

[GMC]

Yeah, I could write a book on “Never heard of that before”

Some good back up plans there Mick but it was a bit hard to deny knowledge of it as all I heard was the crack.
It was the owner that told me what happened as he had to duck and now it’s disappeared into long grass within a 1 kilometre radius.
I had just helped unload my Step sons bike out of the back of his Land Cruiser and he had taken the front wheel out to make it fit for the journey from Qld.
It’s all part of evening things up after he blew up my Navara and crashed my Commodore years back

Myabe I could just weld up the hole

[Mick D]

Yeah, I could write a book on “Never heard of that before”

Some good back up plans there Mick but it was a bit hard to deny knowledge of it as all I heard was the crack.
It was the owner that told me what happened as he had to duck and now it’s disappeared into long grass within a 1 kilometre radius.
I had just helped unload my Step sons bike out of the back of his Land Cruiser and he had taken the front wheel out to make it fit for the journey from Qld.
It’s all part of evening things up after he blew up my Navara and crashed my Commodore years back

What a crack-up . Pay-backs a bitch ain't it. I still don't reckon your even but

Myabe I could just weld up the hole

Yeah do that Geoff, the weld up thing. Tell him sight glasses are for pussies anyway.

[smed]

Damn,thought you musta found it! Years ago i snapped the lever mounting lugs off a master cylinder in a cartwheel endo down a fugging big hill,I had the bits welded back on all sweet but the sight window turned into a blob of molten glue from the heat,I filled the window with araldite & it worked a treat,sold the bike like that years later.

[monaro308]

There you go Geoff...machine up an alloy bung and araldite it in.
No pressure in the master at that point.

[GMC]

There you go Geoff...machine up an alloy bung and araldite it in.
No pressure in the master at that point.

Yeah, that might be the go.
I was thinking it was under pressure but now that I think about it I realise it's not

[Hoony]

There you go Geoff...machine up an alloy bung and araldite it in.
No pressure in the master at that point.

excellent thinking Mario !

[monaro308]

Some credit to goes to smed as he mentioned araldite,just hope its ok with b/fluid.
Even a super tight full rubber grommet with a groove machined/filed into it and pressed in....may even swell to fit

[GMC]

I made up a round alloy plug, but then I couldn't find any Areldite so I welded the sucker in.
It's now one of those trick "works" parts.

The bastard never checks fluid levels anyway, which is why me Nav. doesn't run anymore

[evo550]

There you go Geoff...machine up an alloy bung and araldite it in.
No pressure in the master at that point.

Yeah, that might be the go.
I was thinking it was under pressure but now that I think about it I realise it's not

Next time, loosen the master cylinder cap before compressing the pistons, it sounds like at some time someone has "topped up" the system when the pads where worn. This has over filled it, when you tried to make room for the new pads, that extra fluid had to go somewhere......outwards.

[GMC]

Next time, loosen the master cylinder cap before compressing the pistons, it sounds like at some time someone has "topped up" the system when the pads where worn. This has over filled it, when you tried to make room for the new pads, that extra fluid had to go somewhere......outwards.

Yeah, I might have been more aware if I was fitting new pads but i was just refitting the wheel after transport and the pistons had worked their way out on the journey.

Now to look at why it seems to be weeping around the water pump

[sa63]

you can also machine a piece of acrylic / perspex from 3 , 4.5 or 6.0 mm sheet and stick it in, but sounds like you sorted it. any plastics place would have miles of off cuts