Worn Out Brake Pads

I wouldn't worry about it . Just stick some new pads in. Personally I use soft pads in the rear as it's more gentle use for me . Should bed in ok

 

Guillermo Salinas.
Wow never seen anyone wear pads down to metal surely you brake was fading for ages. But no unless badly scored just run a sandpaper over the disc to remove any glazing.
Regards
Joe.

 

Guillermo Salinas.
Yes what you need to do now is there is a rubber o'ring inside the piston orifice rub that with fluid and a smear on the back of the piston just keep it even and pop it back in. It is quite hard to start and helps if you release the bleed nipple. It will pop back in then drive both back evenly. Job done careful not to damage the o'ring but I have never damaged in all the years I have been cleaning brakes and do replace those pads.
Regards
Joe.

 

Good job on getting everything cleaned up before reassembly you now need to properly bleed all the air out of the system to get a firm pedal. I don’t know what method you are using but try this. Fill the reservoir with clean, fresh brake fluid. Push down on the pedal then open the bleed nipple slightly. With the pedal still down close the bleed nipple and SLOWLY allow the pedal to return to rest. Repeat as many times as is necessary to get a firm pedal but keep an eye on the fluid level as you don’t want it to run out or you’ll have wasted a lot of time and effort. Sometimes if it is possible it is beneficial to raise the calliper above the level of the reservoir as it is easier to make the air rise in the lines than try to force it downhill, if that makes sense. If you have to resort to this method you will need to use a block of wood in place of the disc, and it helps to have an assistant.
Don’t worry about the pads making slight contact with the disc as you rotate the wheel, that’s quite normal, what you need to avoid is if there is contact enough to cause the brake to bind as this is a a dangerous situation that can lead to the wheel locking up as things get hot and expand, jamming the brake on, but you got things all cleaned up and lubricated so it should be fine.

 

Good news and when it comes time to change the front brake fluid you now have a method to use, brake fluid should be renewed every 2-3 years.

 

Yes you could be, do you use it a lot? I tend to use front all of the time and rear brake for balance to counter nose dive.
Also it may be worth bleeding once more just to remove any remaining air?

 

It depends what is causing the noise..... is it a squeal or a grinding sound? A squeal is high frequency vibration that brake grease between piston and back of pad (and opposing calliper fingers) should minimise.

A rough, grinding sound needs investigating as something is not right. Strip, check, clean and carefully reassemble. Just make sure your pads are sitting straight on the backing springs and are not jammed at an angle.

 

I have just changed pads on my CBF600 and have got a grinding noise, it feels/sounds as if it is the pads just bedding in as its a different make.
I put some copper grease on the back of pads just in case it is chatter!!