Brake piston compression?

[hawkhan]

I am changing my front and rear brake pads, and am having trouble compressing the pistons of the calipers in order to get the new pads on. Is their a trick of the trade to complete this task?

Thank you

Yusef Khan

[DefTrap]

Hi Yusef. Have you taken the top off of the master cylinder? Make sure the pistons are really clean (an old tootbrush is good) and then they should push back in fairly easily, though you should keep an eye on the master cylinder fluid level as it'll rise, of course, as you push the pistons back in.

I tend to strip the brake calipers every time I put new pads in, makes for a nicer action. You might have to do this if the pistons are really sticky.

Al

[Dirk]

_________________
<'91 Bros 650 Mk1>
Front end: Bros Mk2 front wheel; Stealth wavey disc; NC30 front brake.

Hi AL , is this right , you use one NC30 caliper ? do you know , that the pistons of the NC30 calipers are smaller as the pistons of the RC31 BROS or RC30 caliper


@ hawkhan : there are tools to push the pistons

[DefTrap]

Hi AL , is this right , you use one NC30 caliper ? do you know , that the pistons of the NC30 calipers are smaller as the pistons of the RC31 BROS or RC30 caliper

Yep. Works fine.

@ hawkhan : there are tools to push the pistons

I don't think it's necessary on calipers with reasonable access. Generally I'd say that if you can't push the pistons back in under finger pressure then they deserve a strip down or there's something else amiss. Nice tool though - I like tools.

[Dirk]

Hi AL , is this right , you use one NC30 caliper ? do you know , that the pistons of the NC30 calipers are smaller as the pistons of the RC31 BROS or RC30 caliper

Yep. Works fine.

That´s good

Here´s my tool for the oem HAWK caliber

[DefTrap]

Here´s my tool for the oem HAWK caliber

And here's mine -

[HypnoToad]

How difficult is it rebuild the caliper, recently I had to push mine back with a clamp and even that was hard.

Is there a rebuild kit available.

[fabitappi]

Toad, yes Bros caliper spares available with WEMOTO.
Pistons, seals...

[Doc]

Easy... Just did it on a friends bike the other day. I hope I did it right....

[HypnoToad]

Thanks guy I'll get them with my monthly order to wemoto and only £19 just saw the "Speedo and Tacho Cover - Top Case"--have to have that as well -£42-- One day I'll buy so many parts is won't be the same bike................it will be Better..

[hawkhan]

strip the caliper? What does that mean?

[kiwi]

dirk
we must shop at the same tool shop, I use that also.

[Dirk]

dirk
we must shop at the same tool shop, I use that also.

and it works

[DefTrap]

strip the caliper? What does that mean?

Remove caliper from fork leg.
Push pistons out under fluid pressure (can go into more detail here if you want to do this).
Split brake caliper.
Remove pistons seals.
Thoroughly clean brake caliper.
Refit seals if serviceable or bung new ones in.
Refit pistons (discussed above).
Refit caliper.
Prime and bleed brake system (again, can go into more detail here if you want to do this).

It's not that hard, honest.