How to bleed Clutch Master Cylinder
How to get bleed air out of a clutch master cylinder
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yo I got another one fun one here
I got a 2008 Mazda 3 manual transmission
5-speed this guy had a slave cylinder
put in it it's um
buried in a good spot that's the slave
cylinder it was leaking so he had it
replaced by somebody and they replaced
it and they couldn't get the clutch to
work right so the guy eventually he
eventually ended up putting a master
cylinder on it which is buried way to
head back behind the firewall it's in a
really bad spot you got to take a clutch
pedal apart and all kinds of stuff I
can't even see it without taking this
battery box out but it's buried under
the dash it's a real pain in the butt to
do so the guy ended up putting a master
cylinder in it because he thought it was
a problem and then that still didn't fix
it so I guess he put a new he put a new
line in it too and what happens with
this car is it's all bled out I actually
bled it out then it didn't do any good
the clutch works and then as soon as you
go out on the street sometimes you get
about half a pedal and it stays half
down and it doesn't you actually got to
pump it up because to make it work the
guy thought he needed a clutch and he
doesn't need a clutch he's got air in
the system and it's it's really hard to
bleed out because for some reason on
this vehicle it ends up being trapped
now this has got it this is your your
master cylinder for your brakes and it's
got it's got a hose in the back that's
that's connected to this same reservoir
for your clutch so there's no separate
reservoir for this either
he's definitely got air in here there's
no air in the system it's trapped in the
master cylinder I I run into this
problem actually quite often with
vehicles where you can't get air out of
the master cylinder so I'm gonna I'm
going to show you how I do it what I do
is I dead I dead had the master cylinder
I don't know if that's the right
terminology for it nobody ever tells
how to do this nobody does it this way
but this is how I do it so I'm gonna
show you how I get the air out of here
real quick there's a real big headache
saver for these cars and like I say I've
run into this with a lot of vehicles
when I want to replace a master and a
slave cylinder first thing we want to do
is um well you want to block the rear
wheels or something or put the ebrake on
if it still works you want to jack up
the front of the cars as far as you can
and leave the back end low because what
that does is it it makes instead of the
master cylinder being level with the
ground it's actually up a little bit
because the fluid line that goes into
your reservoir is usually in the front
of the master cylinder so it's just a
good idea to do to try to get the air up
to go up as far as akin then I got to go
in here I got to find a flexible line
somewhere on the master cylinder you
want to put up you want to put a needle
nose vise grip on this flexible hose you
don't want to get it too tight you want
to get it just tight enough to stop the
fluid flow you want to crush the living
crap out of the hose or anything but
just do that yeah you can GZ cam and see
that master cylinder it's just in a
really bad spot I'm gonna take this cap
off just for fun then on the clutch
master cylinder you want to push it down
and you should you should feel it pump
up just hit it a bunch of times and
that's what I mean by dead head and the
the master cylinder there's there's no
place for the fluid flow to go except
for up now this isn't this isn't
necessarily going to push any of that
air up so what you got to do now is push
down on it really hard and it's going to
force fluid flow to go past to go past
my vise grip and then what I do is after
it's down it'll stay down because
there's no there's no pressure to pull
it back up so I pull it up by hand
and then I can check it again and it's
nice and solid and a lot of times you
know what you don't want to hit this
more than once because some of these
master cylinders on some vehicles they
don't have a retainer clip for the
piston and if you keep pumping the damn
thing once in a while you'll get one
where the piston completely pops out of
the slave cylinder and then you got to
take all the crap apart so now I'm going
to look down here just for fun now if I
look down here I can I can tell that
just the slave cylinder actually pushed
out disengaging the clutch and you can
tell the rods longer because that rubber
bellows boot is spread out more so you
know you you know you know the piston
rod and they're moved out so it's out
and it's stuck out because of that vise
grip I pulled the pedal and now alls I'm
gonna do so now this air this airs is is
still in the master cylinder maybe and
it's got no place to go but up so I just
take this flight strip off and then a
lot of times if if you get this if you
get this master cylinder totally full
sometimes when you hit the pedal when
the when the vise grip is on sometimes
you'll see this level come up a little
bit because because the air is actually
trying to push itself out and then and
then when you take the vise grip out if
this is all the way full a lot of times
you'll see a little bit of air bubbling
out of the top of this master you do
that a couple of times and this is going
to work now I can hit the pedal and it
feels it feels a lot better already
so I'm gonna call that a fix okay bye
