New Deore brakes – air in system. Quick fix?

Morning all, got some brand new Deore M615 brakes, and put new rotors on at the weekend. I had to push the pistons in a bit, and I did the rear piston while the bike was upside down. Turned the bike over and the lever pulled to the bar.

I’ve fixed it by doing the old ziptie the lever to the grip overnight trick, and they’re fine again; but was wondering if this should have happened with a brand new set of brakes – presumably they should have come fully bled? Seems like there’s definitely air in the system.

Is there a quick fix? Doesn’t seem worth a full bleed when the oil will be brand new and sparkling clean – any way I can just top it up, or am I just being lazy?

Thanks.

Cheeky bump… can anybody help please?

My zees needed bleeding from the box. Mechanic in lbs says he doesn’t sell them without bleeding them first

You could try cracking the bleed screw on the lever

The Deores don’t like being turned upside down. Realised this after trying to get round the fact that I had a European pair by fitting them the wrong way round!! After one ride changed them back and had to bleed as they had gone mushy. Ended up changing the levers around at the same time

Get yourself a Shimano bleed bucket, fit it on the reservoir, top it up, and keep flicking the lever until you get no more bubbles(tilt it side to side to release trapped air, and make sure there are no high spots in the hose routing to create air traps). Always worth doing on any new brake to prevent your scenario occuring on the trails.

Old school bleeding works with reservoir cap off pull leave and then open bleed valve on caliper (that is connected to a tube and jar etc), close valve and release brake lever. Repeat while adding more brake oil until it feels very firm with no spongeyness.

Just to add does the same thing happen if you have bikes hung vertical against a wall?

Mine needed bleeding out of the box, upside down is not a deore thing it’s a air in the system thing, my avids did the same, turning the bike upside down makes the air move.

Short answer bleed them, they are very easy to bleed.

buy yourself a bleed kit from Epic Bleed Solutions[/url]realy easy to use, in fact if you’e got other brakes get the universal kit well worth the little bit extra!

Thanks all, looks like a bleed is in order then…

On the bright side, as they are brand new, any fluid can be re-used.