Nc30 front brakes dragging

[Cammo]

There is one thing ive noticed about the master cylinder piston. The brake lever isnt letting the M/C piston to return all of the way out. Its still pressing down on it maybe 1/16th of an inch or so when i let go of the lever. is it normal to be like that? I think this is a real honda lever...

That is normal, there needs to be some pressure on the m/c piston otherwise the lever would feel loose and sloppy through it's initial travel.

I've had brake rubbing troubles and this was the first thing I looked at. My trouble is definitely due to the caliper pistons sticking, yet to tend to them.

[regcheeseman]

Dragging brake pistons are rarely due to pistons, by all means clean and polish them but don't put them in a lathe.

Pop out the seals, it is always the outer seal that causes the problem, make up a scraper tool that fits the groove (I use a small boring bar ground to suit). Clean out all the crud.
Clean the seals, do not use solvent, I find WD or Duck oil ideal, don't stretch them as you clean them and then fit them back in. A light smear of copper grease to piston and seals and pop them back together.
Takes a while to do a full set of calipers but they should be perfect afterwards.

pumping pistons until they are nearly out of the caliper before undoing the lines save a lot of hassle, else I use compressed air and a rag to blow them out. Using mole grips is a bad idea.

[fastdruid]

Don't use copper grease on the pistons and seals, use red rubber grease.

You should only use copper grease on the backs of the pads and on the pad pins.

Druid

[regcheeseman]

They ain't rubber - they are silicone/synthetic and impervious to copper grease - been doing it for years and years no probs yet......

But if you have red rubber lube or silicone liquid to hand - enjoy!

[keithcar]

Hey guys i used rubber grease.. cleaned the little seals out and all is well!! spins free!

The hardest part was bleeding the brakes!!! i couldnt get the lever to firm up.. finally figured out to loosen the banjo bolt on the m/c and bleed it there first..

[wullvfr]

good job keithcar!!!!!
takes time and a little patience whilst bleeding the brakes.....you can buy banjo bolts these days that have a bleed nipple built in.makes it a little easier and cleaner.

william