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donniemateno
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Joined: 01 May 2011
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PostPosted: 10:23 - 16 Feb 2013    Post subject: Help Required! Dont know whats gone wrong! Reply with quote
I previously posted on here about my brake being spongy and gunk coming from behind the lever.

I was advised to buy a master cylinder repair kit which I have done to repair mine

anyway I took it apart today and after a bit of WD40 the old piston came out, yay!

now I've just looked at the new part which is identical to the photo in haynes.......but nothing like which came out! see pictures.

The one which came out was help in with a washer spring and clip and the one I have to put in is over double the size!!!

advise please i dont wanna be mugged by a garage when this does seem a simpple repair Sad
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donniemateno
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PostPosted: 10:24 - 16 Feb 2013    Post subject: Reply with quote
BTW its a CB500 R reg...sorry shoulda mentioned

and after a tiny bit of googling there is this kit:
https://www.wemoto.com/bikes/Honda/CB_500_V/97-98/picture/Rebuild_Kit_Brake_Mastercylinder_-_Front/

but thats still totally different to what I have
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dansp1
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PostPosted: 10:34 - 16 Feb 2013    Post subject: Reply with quote
Photos are really poor which doesn't help, but it looks as though you haven't got the piston out of your master cylinder yet!
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donniemateno
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PostPosted: 10:35 - 16 Feb 2013    Post subject: Reply with quote
at the risk of sounding thick is the silver shaft i removed which is in the top photo not the piston?
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dansp1
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PostPosted: 10:39 - 16 Feb 2013    Post subject: Reply with quote
looks like the actuating rod to me, the piston is stuck inside the cylinder, a little "percussive maintenance" may help, or compressed air if you have access
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Copycat73
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Joined: 11 Jan 2013
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PostPosted: 10:40 - 16 Feb 2013    Post subject: Reply with quote
dansp1 wrote:
Photos are really poor which doesn't help, but it looks as though you haven't got the piston out of your master cylinder yet!


+1

don`t throw any of those bits out, i suspect that the long black bit will need reusing.
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donniemateno
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PostPosted: 10:42 - 16 Feb 2013    Post subject: Reply with quote
ah yes I have got it own. thank you but ive just uploaded another picture. there completely differnt
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dansp1
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PostPosted: 10:47 - 16 Feb 2013    Post subject: Reply with quote
Probably had the wrong master cylinder fitted at some time, the one on the right looks too big a bore for a single caliper set up, you want 12 13 or 14 mm bore size at most, that one looks 17mm?
would explain your crap brake too
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lllN30lll
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Joined: 12 Jun 2005
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PostPosted: 10:50 - 16 Feb 2013    Post subject: Reply with quote
You sure it's the right kit?

or does it look like you need this one?

https://www.wemoto.com/bikes/Honda/CB_500_R_T/93-96/picture/Rebuild_Kit_Brake_Mastercylinder_-_Front/
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donniemateno
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PostPosted: 10:52 - 16 Feb 2013    Post subject: Reply with quote
the link you sent me that the kit I have

But the shaft on the left just seems too long I can probably fit in in but dunno if thats just going to leak?
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dansp1
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PostPosted: 10:53 - 16 Feb 2013    Post subject: Reply with quote
what is the size of the master cylinder you have? (it is cast or stamped on the body)
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donniemateno
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PostPosted: 10:59 - 16 Feb 2013    Post subject: Reply with quote
only stammp i see says te29 13

as i posted before is this not the same part that came out? https://www.wemoto.com/bikes/honda/cb_500_v/97-98/picture/rebuild_kit_brake_mastercylinder_-_front/ which would explain why this 96 part wont fit my 97 bike >_<
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dansp1
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PostPosted: 11:02 - 16 Feb 2013    Post subject: Reply with quote
measure the diameter of the piston
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lllN30lll
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PostPosted: 11:07 - 16 Feb 2013    Post subject: Reply with quote
so they've sent the wrong kit.
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donniemateno
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PostPosted: 11:07 - 16 Feb 2013    Post subject: Reply with quote
piston which came out 13mm piston supplied 11mm
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Hetzer
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PostPosted: 11:11 - 16 Feb 2013    Post subject: Reply with quote
lllN30lll wrote:
so they've sent the wrong kit.


Or he ordered the wrong one.
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donniemateno
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PostPosted: 11:13 - 16 Feb 2013    Post subject: Reply with quote
receipt has model CB500 V...which this clearly isnt for. Sorry for bothering all yu guys just seems been sent wrong part Sad

Will have to use the horrid seicento for commuting till the right part shows up Sad
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lllN30lll
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PostPosted: 11:15 - 16 Feb 2013    Post subject: Reply with quote
He ordered this for his '97 https://www.wemoto.com/bikes/Honda/CB_500_V/97-98/picture/Rebuild_Kit_Brake_Mastercylinder_-_Front/

But ended up receiving this one instead https://www.wemoto.com/bikes/Honda/CB_500_R_T/93-96/picture/Rebuild_Kit_Brake_Mastercylinder_-_Front/
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dansp1
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PostPosted: 11:17 - 16 Feb 2013    Post subject: Reply with quote
wrong kit or wrong master cylinder, all the kits on ebay seem to be 11mm
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donniemateno
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PostPosted: 11:18 - 16 Feb 2013    Post subject: Reply with quote
The V model looks correct...well visually anyway
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