rd400e rear brake binding

[noonster]

Fitted a stronger spring into rear master cylinder,this now makes the plunger operate a lot better and does not stick.
The rear brake calliper still is binding a bit.
The calliper piston came out easily,now lunge or rust,seal looks ok,clean inside.
little grease pushed piston back in with fingers.

The problem i have is bleeding the rear calliper,can't seem to get the air bubbles out.
fluid is passing through,topping up reservoir.

brake paddle seem to be better,took it for a run,back brakes a lot better now.

but even tho the back wheel spins free enough,it still makes a noise of sticking and disc was warm.

what else can i do. ,its as if the pads are not fully coming off,can feel resistance now on brake peddle and the back wheel is locking up when braking.

[ypvs400]

Not sure if this is your problem but many caliper seals are directional and they may be in the wrong way.

[reedpete]

Did you take the pivot pin and tube apart and grease ?
The calliper is one sided so when the piston backs off the calliper needs to recenter itself. To do that it needs to pivot freely.

[wozzap]

It’s usually the small pressure relief hole in the master cylinder that is blocked and is stopping the piston coming back when you release the brake