Hi YouTube! I had not originally planned to make a video on bleeding brakes from empty.
But then I thought what if people don't know how to!?
[music]
hey guys my name's Aaron
from Built On Purpose. In this episode I'm just going to bleed
the brakes for my Datsun 240Z. Currently I've rebuilt the brake system
which included new master cylinder, rebuilding the front calipers, rebuilding
the rear drums. Currently the brake system is dry, it's empty so I've got to
bleed it, um, and in this video I'm going to demonstrate how I go about that.
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So before I start actually bleeding the system proper I'm going to get
introduced some brake fluid into the system just to get on the seals get
throughout the brake system. This master cylinder has never had any brake
brake fluid in it so I always thought it was a good idea to get it flooded so to
speak before I start bleeding properly. So before you just go throwing brake
fluid in your car it's a good idea to understand what brake fluid what DOT
rating you need to put in your vehicle. In the case of this Datsun it's dot 4
brake fluid. Don't go any higher. Don't go any lower. The higher ratings are
normally reserved for cars with ABS that need a different viscosity and the ones
lower a reserved for cars that are a bit agricultural. So don't don't think
buying oh I'll just go get 5.1 and throw it in my old Datsun. You'll probably
find that that'll be detrimental to your brake system in its performance. So I
love Penrite so I'm just throwing a bit of Super DOT 4 in. Okie dokes! Time the top
of the reservoir so the front one in the Datsun is, well normally the biggest one
is the front brake circuit because it's got bigger pistons to push, more fluids
to push needs a bigger reservoir, so it's just a matter of topping it up. Um, what
I like to do is actually have a bottle a half-full bottle for this or I keep
an empty bottle that I top-up to keep half full rather than trying to pour my
fluid in from a full bottle because I always found, that there cause that would
spill damage the paintwork, so that's just something I like to do because I
find it easier to top everything up.
So just put some fluid in. Watch it for a bit.
Hmm you can see it going in but it's a bit of a waiting game. Okay so I'm over here at the front
brake caliper. With the Datsun system it is a front rear circuit they're separate
circuits so you have to bleed each one separately. But first yeah I'm priming
the line so what I've got is a bit of tube that fits over the bleed nipple and
you basically just push it on.
Its a good fit. And dunk the other end in a reservoir some kind, a jar perhaps, and what we
will do is we will top up the master cylinder with fluid and keep an eye on
it because we don't want any bubbles to make its way down and we just loosen this
off a half turn and just wait for the fluid to come out.
Once that's done we'll do it on all four corners of the car and then nip it
up and then come back and then we'll bleed the brakes. I don't know if you can see that
but it is going down you might be able see the fluid line receding on the
reservoir there but you'd see it starting to get in pretty quick. I'll just nip
this brake off, brake line off here.
You can see very fluid starting to come
through so nip this one off and go repeat the same for all four corners of
the car. So it's onto the back circuit. Top this up with some fluid. If you are
getting any value from this video give me a thumbs up, give me a like. So the
brake systems primed going back and bleeding it's virtually
the same process as priming the line except what you want to make sure is the
end of your hose is submerged in some clean brake fluid and instead of waiting
for the brake fluid to feed through by gravity you pump it through with the
brakes. I found that to be the most effective way to do it on my own. You
keep pumping it until the fluid that comes out of that tube there's no
bubbles in it or it's clear. Sometimes, particularly with the with with the rear
brake circuit for the 240 Zed's the lines go down and then up in the
bodywork then to the brake so there's often a bit of brake fluid left in the
rear circuit that you'll have to bleed out which probably can get quite cloudy.
Once you've done that nip everything up you should have a
very firm pedal. Rightio! So the brake's bled, the pedals firm, I'm happy with that but
that's how I bleed brakes. I'm limited to a "solo routine" after you have your own
way that's different or even better leave a comment for this video. Before
this video ends I'll get a plug in for my own shirt I've got a few designs. If
you're interested in having a look the link to the shop will be in the video
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with someone else you might know. Thank you for watching and I'll catch you in
the next video!