How to Rebuild the Rear Brake Master Cylinder on a Honda CBR 600 RR |

Hello, John Talley here with Today I want to show you how to rebuild the
rear master cylinder on our 2008 Honda CBR 600 RR. It starts by just draining out the brake fluid,
so let me go grab a couple of tools and let’s get started. Alright, let’s go through some of the tools
you’re going to need to get this project done– nothing that extreme. You just need a 8mm, a 12mm, and a 14mm–
just open ended wrenches. A set of needlenose pliers, 12mm socket, looks
like a 5mm Allen, a 90 degree screwdriver makes life a lot easier, a regular screwdriver,
a pick tool, and most importantly you’ll need a set of circlip pliers. So once you’ve got all that, we can get it
done. Alright, let’s go ahead and get the fluid
extracted out of here. Connect it up. Let’s get off our reservoir cap, or cover
as it is. Go ahead and get it out of there. Alright, that should get it. You’re going to need to get out of the way
first. A very small cotter pin on the backside. Break this loose. Alright, next let’s go ahead and take off
the main line going to the caliper. Be careful not to lose your crush washers. Next, we want to take these off. Get it off the machine and then we’ll remove
that reservoir hose. It’ll be a little easier to get a hold of. Alright, get this reservoir line off. Alright, now she’s off. Let’s head over to the teardown table and
get it rebuilt. Alright, so let’s get this thing pulled apart. First thing is to get this broken loose on
the end so we can get that boot out of there. Get the boot out. Alright, now tucked up in there is a circlip. Looks just like this one. What you’re going to want to do is reach up
in there, grab it like this, and then compress it. When you do that you should be able to shimmy
it out of that bore. There we go. Keep a little bit of pressure on that spring
makes it easier to pull it out. And that’s the whole assembly. Alright, let’s go ahead and get that sprayed
out and cleaned out. Next, you need to go ahead and get our seal
put onto this piston. Yeah these things can be very tricky to get
on there. You want to make sure that it gets on there
flat and it doesn’t have a folded edge or anything like that. So it takes a little bit of manipulation slash
patience. There it goes. Alright, now she’s in there right. Alright, let’s start coating this stuff down
with a little bit of brake fluid and see if we can get her put back together. Alright, here comes the fun part guys. We need to push that spring back in far enough. Get the plate back. Alright, what we’re going to do is just walk
this back and get it to pop back in that groove. There she is. That little snap you just heard? That was it going back into the groove. Alright, next we’re going to get our new boot
on. Let’s go ahead and get our arm and pinch bolt
back on. Alright, let’s go get it back on the machine. Alright, assembly is just the reverse of what
we did earlier. So let’s go ahead and get this hose reconnected. Get that clamp slid back down into place. What I didn’t mention earlier what are some
of the signs that you actually need to rebuild your master? One of the most obvious is if you’re having
trouble getting the brakes bled and they’re just feeling really spongy, that probably
means that seal on the inside is starting to break down and when it does that it loses
pressure. So that’s a very good indicator that your
master cylinder is in trouble. Alright let’s get your main line high pressure
going back to the caliper, put it back on. That’s snugged in place. Next let’s go through the brake lever itself. Alright there with your washers they actually
go on either side of this piece right here. Last but not least we need to get that cotter
pin back into position. Alright guys, well that pretty much wraps
this one up. All we have left now is just to refill the
system and then bleed it. And if you would reference our video and I’ll
show you how to get that done. Well listen if you need any of the products
that we used in this repair, come see us at and we can get you taken care
of. If you have any questions or comments just
leave them in the section below and I’ll do my best to answer them. Until next time, we just want to say thanks
for watching.

13 thoughts on “How to Rebuild the Rear Brake Master Cylinder on a Honda CBR 600 RR |

  1. Good video. I think most of the people need help knowing the order of installation for the piston items. I couldn't quite catch the detail from my manual as to the direction of the spring and seal assembly with the piston. Video did pretty good job of it's detail.
    Refurbishing 1981 GS850 and Partszilla has been a good source for parts too.
    Thanks for your time with the video!

  2. One little thing you forgot. When you do a rebuild it is important to flush and clean the fluid return port in the brake fluid supply well of the master cylinder. If that port is clogged, the brakes can lock when the brake pedal/lever is released.
    The brake fluid supply well is under the plastic tube where the reservoir feeds the master cylinder. The port cover is held in place with one JIS phillips type screw and an O-ring. Remove the screw and plastic port/cover. The port is very small, maybe .010".

  3. hi I have cbr 1100 blackbird rear brakes are sticking ive changed pistons & seals re bleed and still rear brakes grabbing  .so do you think master cylinder needs rebuild

  4. I think the most important part would of been showing clearly and slowly which way the seals went on back on to make sure it worked right without having to strip it down again ! Maybe slow down a bit next time . But thanks for doing the vid anyway .

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