1978 CB750 Cafe build second attempt

I can usually get them out with compressed air, either the old pad or a wood block to retain it when it comes out. Even a shop towel wadded up can work.
Be carefule though, once it "POP"s you can get an instant brake fluid shower at about 100 PSI!
Years ago I had a piston siezed so tight that air would not budge it. I put a grease zert in the bleeder hole and plugged the hose connection. Used a grease gun to hydraulicly press it out. Used lots of grease and a pain to clean out of the caliper bore, but I got it out.
 
Hoosier Daddy said:
I had a piston siezed so tight that air would not budge it. I put a grease zert in the bleeder hole and plugged the hose connection. Used a grease gun to hydraulicly press it out. Used lots of grease and a pain to clean out of the caliper bore, but I got it out.
Click to expand...

That's fuckin' genius, man!

134466914887447.jpg
 
Heh - heh
Hardest part was finding a pipe plug to fit the hose fitting. I have taken banjo a bolt and brazed it shut before but I don't remember why... maybe the same job. ::)
 
All good stuff as always from you two. I am spending my mental efforts on thinking this through while I spend my physical efforts on the CX so I can get that running and proceed with this bike..
 
AlphaDogChoppers said:
The ONLY way I do it is to have it connected to the brake line, and use the master cylinder to pressurize it and force the piston out.
Click to expand...

That's how I did mine, it was totally seized up, I just cleaned it out and got all the crap off the piston, works like a champ now.
 
I used the grease gun method before. Piston was too rusted for the master cylinder, and I got nowhere with the compressed air. Actually took all the grease out, or as much as I could, and put brake fluid in it. Somehow the threads on the grease gun perfectly matched my caliper. Just started cranking that think and it came right out. Pretty messy though.
 
$132 later i have powder coated wheels, they painted the brake drum area which I had to strip with aircraft stripper when I got home but they did turn out nice and are up at Westside Motorsports getting the Spitfires mounted.
2013-03-29_12-39-50_282_zps73f715d4.jpg
 
Man those look stellar! So they actually powder coated your brake surface in the drum?? :eek:
...and Aircraft stripper removes powder coat?
 
Hoosier Daddy said:
Man those look stellar! So they actually powder coated your brake surface in the drum?? :eek:
...and Aircraft stripper removes powder coat?
Click to expand...

yes and yes, I wrapped it up in a bag to protect the wheel and it did work, took a lot longer but it did cut it.
 
Re: Re: 1978 CB750 Cafe build second attempt

AlphaDogChoppers said:
Using air to expel a caliper piston sucks. Not only can it shoot out like a high-speed projectile, often, it simply won't move at all. The ONLY way I do it is to have it connected to the brake line, and use the master cylinder to pressurize it and force the piston out. The master cylinder can produce at least ten times the pressure, but will do it without throwing the piston 30 feet across the room.
Click to expand...

Troybilt started a build thread yesterday in which he described removing much of a finger this way.

I use the grease gun method as well, as i'm kind of a wuss about high-caliber weapon discharge in my garage...
 
Going from spokes to Comstars sounded easy but it has been a chore. With the cost and hassle of new spokes I am still money ahead though. I bought a set of Carpy headers and a chain conversion set yesterday, pictures to follow as I know that's the fun..
 
downtown809 said:
Carpy header, bare as I am a cheap shit. I figure I can wrap this one for less than ceramic.
Click to expand...

I'm thinking you might want to coat that with some high heat paint just to keep it from rusting under the wrap. I dig that exhaust a lot, it interfered with the rear set on my project though.
 
You must log in or register to reply here.

DTT Light or Dark

  • DTT Light
    • www.jadusmotorcycleparts.com
    www.lostapostle.ca/
    www.sparckmoto.com

    Spread the Love

    Back
    Top Bottom