master cyclinders, and getting the right one

pocket_Rocket · Scooby Slapper Joined: 03 Feb 2005 Karma :

im looking to get a new master cyclinder for my bike. its a zx6r j1. was wondering which one to go for, as i have read that getting the wrong one will leave my brakes like a all or nothing switch. could anyone point me in the right direction to which piston size to buy and which master cyclinder.

thanks

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

pocket_Rocket · Scooby Slapper Joined: 03 Feb 2005 Karma :

lol. sorry maybe im not being clear, i want to upgrade to a better master cylinder, with more braking power and that looks good.

hmmmnz · Super Spammer Joined: 22 Aug 2006 Karma :

you already have 6 pot brakes, so i would be looking for the biggest master cylinder you can find,
or get a radial brembo one
or https://cgi.ebay.co.uk/KAWASAKI-ZX-10-R-RADIAL-MASTER-CYLINDER-ZX-10R-ZX10R_W0QQitemZ160195228287QQihZ006QQcategoryZ10464QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
some thing along those lines should be sweet Very Happy

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pocket_Rocket · Scooby Slapper Joined: 03 Feb 2005 Karma :

would i need a radial conversion kit if i got a brembo one? and would i need a brake light lead or something? also how hard would it be to fit?

thanks

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

I'd be wary of buying a radial master cylinder for 6-pot brakes. In my research I found that generally they will have too small a piston.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy

pocket_Rocket · Scooby Slapper Joined: 03 Feb 2005 Karma :

so what would your recommend buying because at the moment my brakes are good but they have to be fully adjusted out to work well. they just don't push enough fluid

thanks

craigs23 · Mr Muscle Joined: 08 Jun 2005 Karma :

A refurb.

When was the last time you checked/bled them?

pocket_Rocket · Scooby Slapper Joined: 03 Feb 2005 Karma :

bled them when i put braided hoses on them, they aren't bad but you do have to pull the lever in far and on the furthest out setting.

craigs23 · Mr Muscle Joined: 08 Jun 2005 Karma :

Sure you've bled them out properly? I wouldn't expect that from a standard setup in good working order, more or less one fitted with braided lines. Will certainly be my first port of call before considering an aftermarket item.

pocket_Rocket · Scooby Slapper Joined: 03 Feb 2005 Karma :

im sure i did bled them well maybe a master cylinder rebuild would help, but as it is my b day soon i thought i would just get a swanky master cylinder Laughing

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

I fitted a Performance Technology master cylinder on my 'busa, big improvement. Got it from BigCC. You have to get a reservoir to go with it (I used a VFR400 one). You also have to buy a fine-thread banjo-bolt with integral switch for the brake light.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy

pocket_Rocket · Scooby Slapper Joined: 03 Feb 2005 Karma :

nice one, that looks good, where do i get a fine-thread banjo-bolt with integral switch from and wont the standard reservoir be fine?

also how hard is it to wire up the brake light?

thanks

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

Well the 'busa has a built-in reservoir so I had to find another, if your bike has a seaparate res then you can use that no problem.

The bolts you can get from BigCC too, or from most places just tell them if you got 1 or 2 pipes going to it (and make sure you get the fine thread). The wiring is simple, all you do is take the 2 wires from your current brake light switch, to the 2 connectors on the new one.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy

pocket_Rocket · Scooby Slapper Joined: 03 Feb 2005 Karma :

just making sure but my braided lines will fit on ? Confused

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Big Pete · Spanner Monkey Joined: 18 Jul 2004 Karma :

prolly worth stripping and cleaning the calipers as well, after a while the gunge build up can tighten up the seals, sometimes the pistons drag, other times they tend to stick in, which will give the symptoms you describe.
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McJamweasel · BCF Junkie Joined: 22 Mar 2002 Karma :

As per the other comments, you need to strip and clean the calipers, possibly replace the seals as well. Those 6 pots are well known for seizing and as Big Pete says that causes the symptoms that you describe.
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pocket_Rocket · Scooby Slapper Joined: 03 Feb 2005 Karma :

i will do this anyway as this is the second zx6r j1 i have had, i had to do this on the last bike, all the pistons totally seized up. will order a set of piston seals and do that when i can but they were changed when i bought the bike about 7 months ago Confused

McJamweasel · BCF Junkie Joined: 22 Mar 2002 Karma :

If they are not very old then the pistons might just need cleaning/greasing. I'd try that before ordering seals - always try the cheap bits first!
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