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Master Cylinder Trouble

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supersim65
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Posts : 28
Location : London

Master Cylinder Trouble

Post by supersim65 on Tue 07 Jun 2016, 12:06 pm

Hi, I'm new to the forum and I'm an idiot.

I got over-zealous last night and I think I've messed up the Brembo master cylinder on my nice new 1998 CB500S.

I couldn't see the level inside the window, so I thought 'hmm, I'll just pop that open and see if it's under/over-filled.' One screw came out fine, and I put is somewhere safe. The other was a bit sticky, and snapped in half en-route out of the hole. Just the head came out. 

So I grabbed the drill, had a go at drilling the second half out, and inadvertently went a bit sideways. I have unexpectedly good drill bits these days. To top it all off, I couldn't for life of me remember where the safe place I put the good screw was. So that's gone too.

So three questions I would appreciate some help with...
1. How unsafe is my newly cable-tied master cylinder cap?
2. Does anyone think I might be able to tap a wider thread into the knackered screw hole? Or am I on the hunt for a new master cylinder?
3. Does anyone have a spare Brembo front master cylinder?

P.S. It was very slightly over-filled by the way. So there really was no need for any of this to happen. Mad
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Anigai
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Location : Dublin

Re: Master Cylinder Trouble

Post by Anigai on Tue 07 Jun 2016, 3:01 pm

1st welcome to the forum.

To answer your questions.

1. Personally I wouldn't worry about it too much but then again I'd use a few cable ties more than your average Joe Bodger.
2. There are a couple of mm spare on the stock cylinder caps and it is only aluminium. Be very careful though but I don't think I really need to mention that.
3. I have a turkey baster somewhere you could hook up to the brake line if it's any use? Smile Smile Smile

muttley1
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Re: Master Cylinder Trouble

Post by muttley1 on Tue 07 Jun 2016, 4:03 pm

Hello and welcome along.

You can get replacement master cylinders on fleabay for £15 or so iirc. Tempted by one myself as the master cylinder overhaul kit is a fair bit more than this.

atb

muttley1
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supersim65
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Posts : 28
Location : London

Re: Master Cylinder Trouble

Post by supersim65 on Tue 07 Jun 2016, 5:22 pm

Has anyone tried those FleaBay master cylinders? £15 for a part that's £200 from Honda on my front brake sounds like a cheap way to die.

Could always use it for basting a turkey though.

I think I'll stick to cable ties, and wait around for an eBay find. Better stick a wanted ad up.
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eternally_troubled
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Re: Master Cylinder Trouble

Post by eternally_troubled on Fri 17 Jun 2016, 10:00 am

Wait until a good second-hand one comes up on ebay - you can also buy an overhaul kit if you want.

It is certainly possible to fix the screw-problem, but it does required a bit of mechanical ability/stupidity and a tap and/or helicoil kit.

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