VIC Found. 4 pot Shimano caliper

[moorey]

Item. Just one caliper needed. Only actually need decent pistons, so cosmetics irrelevant.
Condition. As long as pistons aren’t like in the ones I recently bought ‘as new’
Location. Ballarat
Price. Less than the $50 for replacement pistons or $75 for new deore caliper.
Other info. Could swap for other shimano parts. Should have a complete m785 or m8000 caliper or other various shite.

Don’t ask me how previous owner managed this.

 

[ausdb]

Bugger there was one on a local page the other day but just checked and it's gone now

 

[BurnieM]

MT520 calipers have the same ceramic pistons, straight in line and bleed valve as Deore if you can find one.

 

[moorey]

MT520 calipers have the same ceramic pistons, straight in line and bleed valve as Deore if you can find one.

Cheers. Yeah, cheapest option at around $70. I've taken pistons out of a spare Zee for now. Miraculously, seals in XT are fine. The Zee was unlikely to be used anyway, but will repair it if something cheap turns up.

 

[ozzybmx]

Don’t ask me how previous owner managed this.

Not even just one

Jammed a screwdriver in there and yoinked it on one side.

My mate cracked one on a dual piston a few years back, was only when a moon shaped bit fell out that he realised they were ceramic.

 

[moorey]

Not even just one

Jammed a screwdriver in there and yoinked it on one side.

My mate cracked one on a dual piston a few years back, was only when a moon shaped bit fell out that he realised they were ceramic.

I’ve chipped outer face using incorrect tools in a pinch, and completely cracked one….but these were all inside, behind the seal. I think they’ve been pushed in on an angle, but never seen anything like this.

 

[Asininedrivel]

FWIW I've done something similar with a Saint caliper. Beware handling errors (i.e. actually pack your shit properly with bubble wrap / protection when in storage).

 

[moorey]

FWIW I've done something similar with a Saint caliper. Beware handling errors (i.e. actually pack your shit properly with bubble wrap / protection when in storage).

Good to know. I only checked these because one piston was returning inconsistently. Was going to give the seals a bit of lube. Went to press the offending piston in, and could hear crunching. When I pulled it out, there were big chunks behind the piston. Pulled them all out to check, and 3 of the 4 were the same.

 

[BurnieM]

So you have the new model one pot calliper ?

 

[moorey]

So you have the new model one pot calliper ?

8120 4 pot

 

[BurnieM]

Assuming full set (2 brakes);
Run a 4 pot on the front and buy a new 2 pot M8100 for the rear ?

 

[moorey]

Assuming full set (2 brakes);
Run a 4 pot on the front and buy a new 2 pot M8100 for the rear ?

Got plenty of 2pot XT calipers I could use. Prefer to stay matchy. Like I say, sorted for now with the Zee pistons, after some to revive that. Probably easier to just pick up another Zee caliper….to sit in a box for another 6 years.

 

[komdotkom]

I can tell you that Hope pistons don't fit despite what you read online.
Ask me how I know......
I also have a mint Saint caliper without pistons

 

[safreek]

Item. Just one caliper needed. Only actually need decent pistons, so cosmetics irrelevant.
Condition. As long as pistons aren’t like in the ones I recently bought ‘as new’
Location. Ballarat
Price. Less than the $50 for replacement pistons or $75 for new deore caliper.
Other info. Could swap for other shimano parts. Should have a complete m785 or m8000 caliper or other various shite.

Don’t ask me how previous owner managed this.
View attachment 392445

The "other owner"

 

[MarioM]

@moorey there is an M8120 on WA mtb sales facebook currently . $80 though .

 

[moorey]

@moorey there is an M8120 on WA mtb sales facebook currently . $80 though .

Cheers mate. Reckon I’ll just keep an eye out for a replacement Zee caliper.

 

[moorey]

Update. One of the cracked piston shards must have damaged a seal. 5 min into ride, the squealing starts, then zero power….
Will try to investigate, and swap out the offending seal. Dagnabbit.

 

[Dales Cannon]

Update. One of the cracked piston shards must have damaged a seal. 5 min into ride, the squealing starts, then zero power….
Will try to investigate, and swap out the offending seal. Dagnabbit.

Was it you or the brake squealing?

 

[Litenbror]

Was it you or the brake squealing?

Depends on where the offending sharp shard ended up?

 

[moorey]

Was it you or the brake squealing?

Yes.