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Re: renault master braking problem
If it's partially sticking even when cold, you need to check if pads are sticking in the caliper and if the piston/s are free to move. Check any moving parts basically.
If it's all free, you might have fluid pressure in that brake pipe even with your foot of the brake.
Check the flexi pipe for crush damage especially where it runs through any mounting points.
I had a Transit that did similar and a tube bracket that holds the flexi to to strut had corroded inside and crushed the pipe. Fluid passed through under braking pressure but couldn't flow back causing brake to stick. The piston was almost impossible to push back unless the bleed nipple was opened due to the restriction.
Currently in lancs dave's garage:
Scenic 1.4ish 2002. Clio 1.2 2002. Thunderbird 885 1995, Suzuki Gsx600f 1989. Fazer 600 2002. Specialist cement mixer for proffessionals only, not yer average forum numpty. Your car is probably worth more than all that lot put together.