Wagner brake master cylinder

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STRUTYOURSTUFF
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Wagner brake master cylinder

#1

Post by STRUTYOURSTUFF » Fri Oct 12, 2018 1:35 pm

So I rebuilt my Wagner master brake cylinder. It is leaking out of the boot. Any suggestions on where I went wrong? Sorry short description



Andygears
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Re: Wagner brake master cylinder

#2

Post by Andygears » Sun Oct 14, 2018 1:24 am

Did you. Hone the cylinder? In the absence of a hone, an acceptable substitute can be made from a wooden dowel with a saw cut in the end with a piece of 220 grit and then 400 wet sandpaper with some brake fluid as a lube. Use a lathe chuck or drill press or hand drill and hone with the 220 till the cylinder looks clean, wash it all out and finish making a fine crosshatch with the 400. If the rust pits are too deep it will never seal.

My two cents
Andygears

STRUTYOURSTUFF
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Re: Wagner brake master cylinder

#3

Post by STRUTYOURSTUFF » Sun Oct 14, 2018 2:10 pm

I did exactly that Andy. Honed it with 600 wet sand with brake fluid. I am using this master cylinder with a disc brake. Not sure if I rebuilt the guts properly but it sure seems straight forward. Any other suggestions would be great. Thanks for the help

FL54
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Re: Wagner brake master cylinder

#4

Post by FL54 » Sun Oct 14, 2018 2:34 pm

I'm no expert and surely someone more knowledgeable will chime in but I believe the rebuild kits come with parts for both drum and disc brakes. Some are used and others are not depending on the application.

STRUTYOURSTUFF
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Re: Wagner brake master cylinder

#5

Post by STRUTYOURSTUFF » Sun Oct 14, 2018 4:10 pm

That’s what I thought. Can anyone tell what parts and the order they go in?

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Re: Wagner brake master cylinder

#6

Post by RooDog » Sun Oct 14, 2018 4:27 pm

This information is in the Harley Service Manual. Get one...

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Re: Wagner brake master cylinder

#7

Post by Lowbikemike » Sun Oct 14, 2018 4:29 pm

Yes, there differences and you need to know them, but that is not what is making it leak out of the boot.

Either the bore is gouged (rusted) to deeply and your hone did not clean it up or you have the piston cup in backwards. The cup lips face the closed end of the cylinder.

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Re: Wagner brake master cylinder

#8

Post by Panacea » Sun Oct 21, 2018 4:57 am

When I went thru my 64 rear brake cylinder the bore was toast so I took it over to a brake and equipment company and had them bore it out and press in a sleeve, it's worked great ever since...

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