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I fitted a set of Hope tech evos to a new frame last night. After shorting the hose and running hose through the swing arm I bled them.
When finished I rolled the diaphragm on, placed the lid on and put the two bolts in. I was careful not too over tighten them. However when finished I could see fluid coming out by the lid.
I re bled the brakes and repeated the procedure. Same problem. I had already noticed some fluid on the masted cylinder when getting them out box.
3rd attempted and I tightened the bolts on the lid. I sheared the head of one bolt clean off. I then had a little cry.
Is there any way of getting the bolt out. Not enough showing to grab hold of with pliers and twist out. Two small to drill out (I assume). Any bright ideas before I order a new master cylinder?
If you're going to order another one and fit it yourself, then it's probably worth getting the drill out!
I'd drop Hope a line, they're normally brilliant with advice and help....
yes, a very small drill bit is required and a bit of a steady hand.
i've save a couple in the past.
is there any of the thread bit standing proud? one i was aable to turn with a finger nail. there shouldn't be any tension on it to undo.
try dropping the broken off bit in, that might key in enough and grip the other half.
Take your time, you aren't going to get a new one today anyway.
if you are near shrewsbury i'll have a look for you.
Some spare fluid will always ooze out from under the lid as you tighten it down, a wipe with a cloth is all it needs. The fluid in the reservoir isn't under pressure. If you're not bothered about it you could just tape the lid at that end with some vinyl tape. Don't block the breather hole though.
Drilling out a bolt as small as that will be difficult with hand tools; I would send the reservoir back to Hope, 'fess up to your mistake and cross your fingers. You never know, they [i]might[/i] just send you a replacement FOC....
I did this to mine and just used it for a few months like that as it was tight on there...
i did what globalti just said in the end. Job done.
Cheers for the advice. I'll strip it down and ring hope on Monday.
Torque wrench is your friend
On an M3/ M4 bolt ? Understanding how tight to do a bolt up rather than a torque wrench is better.
You might be able to cut a slot for a screwdriver. Then you'll just need to replace the bolt and reservoir cap.
As for how tight, I just nip mine up with a screwdriver shaped tool. It really doesn't need any leverage on it. Any oozing fluid is generally a function of how "tidy" you are rather than the need to tighten things more.
Surely an understanding of what you're doing is the best medicine. A wise man said "A little knowledge is a dangerous thing". I should know, I've bodged enough things by not thinking it through before had.
The top cap only, really, keeps the diaphragm in place.
If the reservoir is over-filled, of course it will leak when assembled, where else is the excess going to go?
I don't, however, understand how Hope can still be making 'Cheesy' bolts. I'm surprised that the bolt snapped before it was rounded off.
It wouldn't surprise me if a bit on insulation tape wouldn't do the trick (being careful not to cover the little breathing holes).
[i]Understanding how tight to do a bolt up rather than a torque wrench is better.[/i]
+1 (but sh!t happens)
Just use the remaining screw and a zip tie or two. The fluid in the reservoir isn't under pressure.
When you take the lid off, is there more bolt visible?
There's 2 things here... One is that if there's even a tiny bit of bolt sticking out, there's a good chance you can get it out. But the other is that you only really get one shot at it so if you're not an experienced stuck/broken bolt remover, it's probably a good idea not to learn on this one.
(get yourself a Suzuki first, you'll soon know all there is to know about the subject)
try supergluing another screw to the bit that is stuck in - and use it to unscrew the knackedred bit