Binding brakes?

[carver]

I got a K1 GSXR thou (twin 6pots on the front).

when the front brakes are applied they do not fully come off, so the brakes are always slightly on.
the bike has new pads and fluid, and the pistons can go right in.

why would this be happening?

[mossy1200]

The inner seals are square edged orings that roll over when brake fluid pressures them then role back when presure releases.If they are worn they will slide rather than role hence wont return.Build up of dirt between dust seal and main seal can also prevent return of piston.First step clean.Next step replace seals and check pistons for wear and damage.

[flyingcrocodile46]

The inner seals are square edged orings that roll over when brake fluid pressures them then role back when presure releases.If they are worn they will slide rather than role hence wont return.Build up of dirt between dust seal and main seal can also prevent return of piston.First step clean.Next step replace seals and check pistons for wear and damage.

What he said

[puddy]

Solve the problem. Buy a K9!

[Max Preload]

There will be shit in the dust seal groove on the caliper putting a load on the piston and preventing it retracting. Disassemble the calipers, clean the grooves thoroughly of corrosion & reassemble.

I'm not sure what the guy going on about rolling seals is talking about - the hydraulic seals are deformed slightly by the fluid pressure provided by you actuating the lever. This creates the sealing pressure - they don't roll.

[Katman]

It may also be a bit of shit blocking the tiny bleed hole in the master cylinder.

This hole allows fluid to bleed into the cylinder bore from the reservoir as the master cylinder piston retracts.

[carver]

thanks guys, i gave the brakes a good smack with a mallet, WD40's the pistons, and greased the slider bolts lightly.

so far, all good.

[slofox]

i gave the brakes a good smack with a mallet...

Now that's my kind of mechanicing...it's called "percussive maintenance"

[carver]

Now that's my kind of mechanicing...it's called "percussive maintenance"

the floating discs had seized up a bit

[The Pastor]

its because your too fast bro, the bike was only desgined to be up to motogp spec riders, not anything above that!

[carver]

its because your too fast bro, the bike was only desgined to be up to motogp spec riders, not anything above that!

haha, too much heat welding the pad to the discs ya think?

[The Pastor]

haha, too much heat welding the pad to the discs ya think?

well the fast riders have to brake hard, its the only way to over take on the road, mid apex.

[carver]

well the fast riders have to brake hard, its the only way to over take on the road, mid apex.

im so fast a brake at the end of the apex

[The Pastor]

im so fast a brake at the end of the apex

now thats pure skill, you must be drafting the car infront hard to get the swing around effect to pull that one off?

[carver]

now thats pure skill, you must be drafting the car infront hard to get the swing around effect to pull that one off?

actually a car aint enough, you have to come up the back of a milk tanker at 160 into a 35 to work that one