GSXR brake caliper rebuild

[JimClark49]

Hi All,

Pistons are in, calipers joined back together, and vacuum pump to bleed brakes is here.

Is the procedure for using pump to bleed brakes as follows:

1) suck old fluid out of reservoir using vacuum pump
2) add new fluid to reservoir
3) Go to caliper opposite the reservoir (i.e nearside), attach bleeder hose, create 10 - 15mmHg vacuum, and then crack open bleed nipple to allow fluid to come out into container
4) keep doing this until fluid comes out clear with no air bubbles
5) Repeat process on offside caliper.
6) Finally use vacuum to bleed at master cylinder until clear fluid (with no bubbles) comes out.
7) Check lever is nice and firm and put the reservoir cap back on

Am I listing the steps correctly? Anything I have missed?

[gwm]

JimClark49 said:

Hi All,

Pistons are in, calipers joined back together, and vacuum pump to bleed brakes is here.

Is the procedure for using pump to bleed brakes as follows:

1) suck old fluid out of reservoir using vacuum pump
2) add new fluid to reservoir
3) Go to caliper opposite the reservoir (i.e nearside), attach bleeder hose, create 10 - 15mmHg vacuum, and then crack open bleed nipple to allow fluid to come out into container
4) keep doing this until fluid comes out clear with no air bubbles
5) Repeat process on offside caliper.
6) Finally use vacuum to bleed at master cylinder until clear fluid (with no bubbles) comes out.
7) Check lever is nice and firm and put the reservoir cap back on

Am I listing the steps correctly? Anything I have missed?

https://www.youtube.com/watch?v=MPL7bpgcmVI

Basically that's it, though I would start at the master cylinder and work towards the furthest away caliper. Just don't let the fluid in the reservoir drop below minimum and keep the vacuum pressure up.

[JimClark49]

gwm said:

https://www.youtube.com/watch?v=MPL7bpgcmVI

Basically that's it, though I would start at the master cylinder and work towards the furthest away caliper. Just don't let the fluid in the reservoir drop below minimum and keep the vacuum pressure up.

Thanks mate.

The reason I thought master cylinder is last is because air rises, and the cylinder is at the highest point.

[battered]

Some bikes bleed from the bottom up for this reason. Mountain bikes especially. You need a syringe full of clean fluid and a hose, attach it to the bleed, pump it up into the MC and remove the XS with another syringe.

[Biker's Nemesis]

I still have a rubber O ring in a cap full of WD40 and it hasn't dissolved or broken up, that was 10 days ago.

[Hooli]

Biker's Nemesis said:

I still have a rubber O ring in a cap full of WD40 and it hasn't dissolved or broken up, that was 10 days ago.

Good job you're not holding your breath eh?

[kev b]

I'll guess the O ring is not made from rubber, it will be nitrile or similar, totally oil proof unlike real rubber which is not used much nowadays.

[Prof Prolapse]

kev b said:

I'll guess the O ring is not made from rubber, it will be nitrile or similar, totally oil proof unlike real rubber which is not used much nowadays.

Moving the goalposts already...

Tell you what, why don't you tell me a widely available rubber automotive product which dissolves in WD40 and I'll soak it like BN is doing. I'll happily post the results either way.

Let's make Biker Banter the QI of Pistonheads...

[Biker's Nemesis]

Prof Prolapse said:

Moving the goalposts already...

Tell you what, why don't you tell me a widely available rubber automotive product which dissolves in WD40 and I'll soak it like BN is doing. I'll happily post the results either way.

Let's make Biker Banter the QI of Pistonheads...

It'll be 2 weeks tomorrow since I dropped the seal in WD 40, what is happening is that the WD 40 is evaporating, I'll up load the video on FB.

I can't be arsed to wait any longer.

[JimClark49]

I tried to bleed the system today with vacuum pump but there is still air in the system as lever is still very soft.

I am not sure what I am doing wrong, how much fluid should I take out of each caliper and M/C? Instruction manual for pump says about 2 inch of fluid.

[Hooli]

Turn the steering the other way.

Air could be stuck at the wrong end of the master to vent out or where the pipes split under the fronyt yoke (if yours do that).