Custom Tools and Brake Caliper Question

[agrady1995]

Hello all. I am getting pretty good at my rebuilds. Can't get ahold of a metric grease gun fitting at the store because: MERICA'. Does anyone happen to know the thread size/pitch of the bleed screw and possibly the main brake line bolt?

I've made a couple custom tools already and am looking to make some more. In this case it'll be an attachment for my grease gun to pump up the pistons for removal, using one of those two bolts. Additionally, if anyone has any other custom tools they've developed over the years, lets talk about that!

Did first start-up on a valk that's been sitting for 8 years yesterday and she sounds beautiful. Can't wait to do the shocks and rear end and go for a loooonnnnggg "test" ride.

[-mike-]

https://redeye.ecrater.com/p/30933883/brake-pistons-quantity-2-fit-honda

comes with the needed grease gun fitting.

-mike-

[da prez]

10mmx1.25 pitch. Can be made from a hose with a banjo end.
                 da prez

[Skinhead]

Why not just use the hydraulics to pump the pistons out before disconnecting the brake lines?

[Valker]

Why not just use the hydraulics to pump the pistons out before disconnecting the brake lines?

The pistons don't come out far enough with the disc (or anything) preventing them from coming almost all the way out.

[da prez]

  The grease gun method works on the impossible ones.  I made an adapter and reuse the grease just for calipers.  A steel or aluminum spacer with a zerk  (not Serk) fitting installed works very well.

                                   da prez

[6adan]

Why not just use the hydraulics to pump the pistons out before disconnecting the brake lines?

The pistons don't come out far enough with the disc (or anything) preventing them from coming almost all the way out.

This is how I always do it now. If it is a two piston and one wants to come out before the other I let it come almost all the way out and then block it with a piece of wood or anything else I have laying around then I will pump the other one out till I get them both out.

[RonW]

You might watch this Youtube video https://youtu.be/T6nVwC23JRU?t=80

A forum member mentioned that this type piston puller "are useless on valkyrie calipers."

[hubcapsc]

Why not just use the hydraulics to pump the pistons out before disconnecting the brake lines?

The pistons don't come out far enough with the disc (or anything) preventing them from coming almost all the way out.

This is how I always do it now. If it is a two piston and one wants to come out before the other I let it come almost all the way out and then block it with a piece of wood or anything else I have laying around then I will pump the other one out till I get them both out.

Grease seems like it would have to work, but be a big mess?

I've found compressed air to work, you gotta be careful not to shoot
the first one that comes loose across the room...

When I just want to push the pistons out far enough to clean them when
installing new pads, I've finally gotten up enough nerve to use hydraulic
pressure. I haven't squirted a piston and a caliper's worth of fluid out
on the ground yet  ...

Here's some pistons starting to come out with air and blocked by a
board.



-Mike

[agrady1995]

https://redeye.ecrater.com/p/30933883/brake-pistons-quantity-2-fit-honda

comes with the needed grease gun fitting.

-mike-

Appriceated but I actually took suggestion from Ross and made my own version of a spacer which fit a grease gun fitting I had in stock today!

[agrady1995]

Why not just use the hydraulics to pump the pistons out before disconnecting the brake lines?

The Hydraulics were not working, and I didn't want to spend too much time doing that on-bike. I had new ones ready to go and swapped them out instead, with a new master.

[agrady1995]

Why not just use the hydraulics to pump the pistons out before disconnecting the brake lines?

The pistons don't come out far enough with the disc (or anything) preventing them from coming almost all the way out.

You can remove the two bolts holding them on the fork and pump them out, then remove it from the line. Not the solution I wanted, though.