Brake Master Cylinder Erupting

[fillpoke]

Hi All. Went to bleed my brakes. Obviously removed top from master cylinder to top it up. Trouble starts when pumping the brake pedal. A huge fountain of fluid erupts from the master cylinder into the air. Surely this can't be right? Anyone any knowledge of this?

[Tom and Maria]

Completely normal, just press gently to begin with.

Tom

[bmcecosse]

Wouldn't expect a huge eruption! Perhaps it's too full? There will be some disturbance of the surface - that should be all....

[simmitc]

I'm with Tom, a spurt is to be expected. I recommend filling the cylinder and then replacing the cap whilst blrrding - it avoids any possibility of getting dirt into the system whilst you are operating the pedal. Obviously you have to remove the cap every 4-5 presses of the pedal to refill, but much better than getting dirt in - and it prevents the fountain effect spilling over.