Front brake master cyclinder

[cowboyup3371]

A concourse build is basically making it look EXACTLY how it looked when it came off the showroom floor - ALL parts

[Big T]

Slide a chopstick in the hose end, tip the cylinder up and tap the chopstick on the table until the piston pops out

[ZombiePotatoSalad]

Slide a chopstick in the hose end, tip the cylinder up and tap the chopstick on the table until the piston pops out

I tried that, it seemed only a small part of the tip went in. Didn't do anything. I tried with a smaller screwdriver, still nothing. How about a heat gun?

And you know that hole under the reservoir, shouldn't I be able to see the piston moving through that hole?

[GSXR7ED]

I tried that, it seemed only a small part of the tip went in. Didn't do anything. I tried with a smaller screwdriver, still nothing. How about a heat gun?

And you know that hole under the reservoir, shouldn't I be able to see the piston moving through that hole?

I know that it seems like it won’t come out...lord knows I had nothing but time when I was working on the road at Holloman AFB, NM...but it will pop out.

It takes “unexpected patience” and you’ll know what I’m talking about.

Ed

[Rijko]

It sounds like there's a piece of metal inside stopping it from coming out.

From the video you posted, yes it does sound like that.
Metal hitting metal, that's not just a rubber stopping the piston from coming out.

Some rebuild kits use a metal washer behind the circlip, and this washer
could've gotten stuck in the groove the circlip was in.


KL_Supply_Master_Cylinder_Rebuild_Kit-904672275.jpg

[Rijko]

So if you push the shaft inwards, what do you see ?

Just the shaft moving inside a metal ring, or also the thicker part of
the shaft going in and out ?

[ZombiePotatoSalad]

So if you push the shaft inwards, what do you see ?

Just the shaft moving inside a metal ring, or also the thicker part of
the shaft going in and out ?

I see a metal shaft, but it doesn't move, even when I move the piston. And I already removed the circlip, the washer, and the rubber gasket.

[Rijko]

That's an obstruction that should not be there,
probably the metal ring/washer.

If you wiggle the end of the shaft of the piston, can you
get that metal thing to move ?

[Rijko]

Is the circlip groove still visible ?

[ZombiePotatoSalad]

Yes, the circlip groove is visible. I look down into the piston hole, and there still seems to be a but of metal holding it in, but I think this is part of the piston itself. There's nothing else down the piston shaft that seems to be holding it in. It wiggles a bit, but won't come out.

[Rijko]

Here it is with the circlip, washer, and gasket removed. I haven't been able to get the piston out.[ATTACH=CONFIG]59956[/ATTACH]

Can you post another picture of the inside ?
In this picture i think i still see a circlip and gasket.

Has every other bolt/screw been removed like on the inside of the fluid reservoir ?
Maybe someone used way too long bolts and one is sticking inside the piston
shaft, blocking the way out for the piston.

[ZombiePotatoSalad]

Can you post another picture of the inside ?
In this picture i think i still see a circlip and gasket.

Has every other bolt/screw been removed like on the inside of the fluid reservoir ?
Maybe someone used way too long bolts and one is sticking inside the piston
shaft, blocking the way out for the piston.

Here's another picture. There's nothing inside but the piston.
15788148211187736404687809342882.jpg

[Rijko]

thanks. First thing is to get the old rubber out.
It blocks the view of the possible cause the piston won't come out.

Use a screwdriver, pliers, heat it .. whatever it takes.

[steveb922]

Get the remains of the rubber boot out.

Push the piston into the bore as far as possible.

You'll now see a washer that was between the circlip (that you've already removed) and the piston. This washer will have corroded/cold-welded to the wall of the cylinder. Use heat, penetrating oil, and some force to break it away. It doesn't sit in a groove. Don't get carried away and damage the cylinder wall!

[ZombiePotatoSalad]

thanks. First thing is to get the old rubber out.
It blocks the view of the possible cause the piston won't come out.

Use a screwdriver, pliers, heat it .. whatever it takes.

I have. The dust cover is out, as well as the circlip, washer, and rubber ring. All that came out.