basic brake bleeding advice
Discussion
hi ,just need a little advice, I've been trying to bleed my brakes with no luck.
my friend is helping me by operating the pedal whilst I loosen and tighten the bleed nipple accordingly.
I've noticed that after I've cracked the nipple undone and he has pressed the pedal down , fluid is displaced into my bleed pipe as expected but then within a few seconds it all disappears back into the wheel cylinder , even with the pedal held down? this is confusing me .
the car is a classic mini with drums all round and front to rear split with a yellow tag master cylinder. everything has been replaced bar the compensator on the bulkhead .
cheers
my friend is helping me by operating the pedal whilst I loosen and tighten the bleed nipple accordingly.
I've noticed that after I've cracked the nipple undone and he has pressed the pedal down , fluid is displaced into my bleed pipe as expected but then within a few seconds it all disappears back into the wheel cylinder , even with the pedal held down? this is confusing me .
the car is a classic mini with drums all round and front to rear split with a yellow tag master cylinder. everything has been replaced bar the compensator on the bulkhead .
cheers
the car has been sat for quite a few years since my dad passed away, brakes were seized on, wheel cylinders leaking and corroded brake pipes etc, basically it's had all wheel cylinders, brake shoes, various pipes and a new master.
I used a ezebleed to start with, got no visible air in my bleed pipe but had no pedal pressure at all after bleeding, even with pumping the pedal.
tried the up/ down two man method, locking the nipple between strokes.
we bled the cylinder first to make sure it was pushing fluid out, then went onto each wheel cylinder in the correct order.
this was when I noticed the fluid drawing back from my bleed pipe and back into the cylinder, have never had this before, and because of this I can't bleed them via the pedal.
the master is obviously displacing fluid and pushing it out of the nipple but as soon as the pedal cones to rest at the bottom the fluid draws itself back in before I get chance to lock the nipple off .
I used a ezebleed to start with, got no visible air in my bleed pipe but had no pedal pressure at all after bleeding, even with pumping the pedal.
tried the up/ down two man method, locking the nipple between strokes.
we bled the cylinder first to make sure it was pushing fluid out, then went onto each wheel cylinder in the correct order.
this was when I noticed the fluid drawing back from my bleed pipe and back into the cylinder, have never had this before, and because of this I can't bleed them via the pedal.
the master is obviously displacing fluid and pushing it out of the nipple but as soon as the pedal cones to rest at the bottom the fluid draws itself back in before I get chance to lock the nipple off .
hi again.
in answer to a few questions, yes it's a new master cylinder, most of the braking system is new.
no leaks etc but no pedal pressure either.
have tried everything I can think of
have previously read those links, have looked at most posts I can find on bleeding brake trouble.
thanks tho
in answer to a few questions, yes it's a new master cylinder, most of the braking system is new.
no leaks etc but no pedal pressure either.
have tried everything I can think of
have previously read those links, have looked at most posts I can find on bleeding brake trouble.
thanks tho
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