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Front & Rear Brake Master Cylinder strip down

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Farmer
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Front & Rear Brake Master Cylinder strip down

#1 PostAuthor: Farmer » Tue Jan 27, 2015 7:12 pm

As I found mostly jellified brake oil in the front when I changed the pipes I thought a strip down of the master cylinders a good idea, consulted my Clymer manual and it says see your distributer/dealer to have it done as it needs special tools.
I duly rang my dealer to be told ooooo that's an old one, never done that before and we have not got the special tool, Z power say they sell a lot of rebuild kits, so my question is can it be done without any special tools and how, also is it wise to strip the callipers as well. :)
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z1bman
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#2 PostAuthor: z1bman » Tue Jan 27, 2015 7:29 pm

all you need is cir clip pliers like these



http://www.ebay.co.uk/itm/Long-Nose-50- ... 48363468c5
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#3 PostAuthor: PAULJAC47 » Tue Jan 27, 2015 7:52 pm

Dont even need them just bust off the old master plunger with pliers,its scrap anyway new one is in the kit!Calipers are ok,just pump out the old pistons with compressed air or the master cylinder when its working,just be methodical and clean..
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#4 PostAuthor: Farmer » Tue Jan 27, 2015 9:33 pm

Thanks men, not as hard as I thought then :)
1981 KZ1000 K1 LTD



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Everything in Sussex is a She, Except Tom Cat and She`s a He.
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#5 PostAuthor: needaz1100r » Tue Jan 27, 2015 9:47 pm

Farmer wrote:Thanks men, not as hard as I thought then :)


Make sure you clean out the groove where the piston seal sits, it can get corroded and aluminium expands when it corrodes, if you don't clean it out properly it can be a devil's own job getting the pistons back in and if you do they can drag.

This is in the calipers of course.
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#6 PostAuthor: Farmer » Wed Jan 28, 2015 7:27 pm

z1bman wrote:all you need is cir clip pliers like these



http://www.ebay.co.uk/itm/Long-Nose-50- ... 48363468c5
I don`t think your talking about the same master cylinder. :)
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#7 PostAuthor: z1bman » Wed Jan 28, 2015 7:44 pm

no your rite yours has a plastic cup which holds it in place :lol: :lol: :lol:
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#8 PostAuthor: Steve Cooke » Wed Jan 28, 2015 7:50 pm

you need to be extremely careful if using compressed air to remove pistons as that can be very dangerous, it's not really advisable.
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#9 PostAuthor: PAULJAC47 » Wed Jan 28, 2015 8:00 pm

Agree, newly painted parts attract said pistons as well,i just pack with wood or rags to absorb shock...Valid point
PAULJAC47,,,,,"She may not look like much, but she's got it where it counts, kid."

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#10 PostAuthor: Farmer » Wed Jan 28, 2015 10:29 pm

The front brake worked ok, I don`t know how with all the jellified oil, I shone my led head torch into the callipers and it looked fairly clean so I filled it up with some brake cleaner spray, took out the bleed nipple and blew it through, I did this twice per calliper and left it at that,
The rear brake worked but was sticking on, took the calliper off and blew through, the oil was fairly clean, peeled back the dust seal to find some crusty stuff, not rust, I squirted some WD40 and pushed it back in the vice, put new braided hose on and bled it up, works fine now, just waiting for front master repair kit from Z power. :) thanks for all your help :)
1981 KZ1000 K1 LTD



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Everything in Sussex is a She, Except Tom Cat and She`s a He.
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needaz1100r
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#11 PostAuthor: needaz1100r » Wed Jan 28, 2015 11:45 pm

Steve Cooke wrote:you need to be extremely careful if using compressed air to remove pistons as that can be very dangerous, it's not really advisable.


keep you fingers out of the way!!
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#12 PostAuthor: Farmer » Fri Jan 30, 2015 5:53 pm

Repair kit came today, luckily I kept the old one as the white plastic cup does not come in the kit. :)
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Al
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#13 PostAuthor: Al » Fri Jan 30, 2015 8:12 pm

keep you fingers out of the way!!


Someone very clever (not me) said that you can pump out jammed pistons with a grease gun.

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#14 PostAuthor: Z1parR » Fri Jan 30, 2015 8:20 pm

Done the grease gun trick before , works a treat .
It's a bastard of a job getting all the grease out later though .
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#15 PostAuthor: Al » Fri Jan 30, 2015 8:33 pm

Blow it out with compressed air just watch youre fingers :D

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