Brake Master Cylinder problems. Need Help

[youngbiker]

I'm working on my master cylinder and i have the reservoir off and i've gone so far as to get the boot off the piston and the snap ring. all the videos i've watched the piston just kinda pops out. i'm worried that mine is rusted very badly and i don't want to replace the whole brake unit just the internals. i've already bought a new reservoir and piston rebuild kit and all the manuals i looked at say take off the backing plate. i just don't know how to do it or why it isn't coming off.

[youngbiker]

the piston just broke and now it's flush with the endcap. is there any hope of getting it out or am i gonna need to get a new housing?

[vern401]

you may be able to use a phillips screwdriver or a pin punch to push it out. did you remove the clip that holds the piston in?

[boyorastroboy]

Maybe you could try an easy-out like for removing screws with their heads twisted off?  It's amazing that it's lodged in there so thoroughly.  Can you take pictures?

[youngbiker]

yeah i'll take some and post them. yeah all the vids i've seen it just pops right out.

[youngbiker]

do you mean the circlip? yeah i took that out. here i've got pictures.
   

[boyorastroboy]

I've pulled three of those out and never seen anything like that...
I'd say try and drill into it so you can screw something into it and pull it out.  I would guess, though, that there's a strong possibility that whatever's holding it stuck with that much force will probably be a further headache to deal with.  You may just want to try and find a replacement on ebay.  

[youngbiker]

i can't find anything for it on ebay. though there is a braided line i want to check out..... but yeah i'm just gonna call the motorcycle junkyard close to me and see how much they would charge for it.

[youngbiker]

also i think that the holes in the housing. the ones that let the brake fluid fluctuate are completely clogged any chance opening them up?

[youngbiker]

or any ideas unclogging them?

[vern401]

I would try to push it out with a Phillips screwdriver going in from the brake line side soak it with anti rust spray of some type first.

Vern

I may have a master cylendar for a honda but its not from a 750.

--- On Thu, 5/27/10, youngbiker [via Honda CB750'S] <[hidden email]> wrote:

From: youngbiker [via Honda CB750'S] <[hidden email]>
Subject: Re: Brake Master Cylinder problems. Need Help
To: "vern401" <[hidden email]>
Date: Thursday, May 27, 2010, 1:43 PM

do you mean the circlip? yeah i took that out. here i've got pictures.
   

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[vern401]

It is also a very good possibility that once you do get it out the housing will not be any good. Even with new seals it may still leak.

[youngbiker]

yeah i think i'm just going to a boneyard and grabbing another one. then taking that apart and using my rebuild kit... whenever that's supposed to get here.

[vern401]

Any luck finding one?
Do you have a single or dual brake system on your bike?

[youngbiker]

just a single.

[vern401]

I'll look and see what I have. Does your resivour have two or four screws holding the top on? From your Pic I dont think I have an exact match though. Did you have any luck using a punch to push it out. First I'd soak it in PB blaster or some other spray that loosens rusty bolts and screws, then try to push it out with a punch and tapping with a hammer. If you have CLR soak it in that for a while first it will help remove the rust. I have used it to remove rust in gas tanks. Try getting it out while I look for a replacement just in case your is toast, I may not have a good one laying around.

[vern401]

The master cylendar I have is no good it is broke whear the bolt holds the brake lever. Sorry.

[youngbiker]

oh it's all good no worries... yeah i tried basically all that stuff and then i tried to drill it out and accidentally hit the wall so that's why i'm going to the boneyard.... next paycheck. ugh.

[vern401]

I know the feeling.

--- On Mon, 6/7/10, youngbiker [via Honda CB750'S] <[hidden email]> wrote:

From: youngbiker [via Honda CB750'S] <[hidden email]>
Subject: Re: Brake Master Cylinder problems. Need Help
To: "vern401" <[hidden email]>
Date: Monday, June 7, 2010, 5:34 AM

oh it's all good no worries... yeah i tried basically all that stuff and then i tried to drill it out and accidentally hit the wall so that's why i'm going to the boneyard.... next paycheck. ugh.

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[fpcb750er]

Did you get a mc? I have one, rebuilt, that a friend gave me, but don't need it as I have now an aftermarket, I can send or post pics if you want to buy it.  let me know.