Changing brake fluid

[dePunietS1000RR]

Could not find a thread on changing the brake fluid on the ABS version.

I am about to put a new master cylinder and want to take advantage of that to replace the original brake fluid with Castrol SRF.

People told me that all I have to do is bleed the front (both caliper and master cylinder) and then bleed the rear. I just want to make sure that I don't leave old brake fluid in there and bleeding front and rear logically seems to miss fluid that would be on the circuit that activates the rear brake when you pull the front brake. I tried to see if the rear wheel would stop when I pull the front lever and it doesn't (with the bike on or off).

Any advice would be appreciated.

[Sl8R]

Originally Posted by dePunietS1000RR

Could not find a thread on changing the brake fluid on the ABS version.

I am about to put a new master cylinder and want to take advantage of that to replace the original brake fluid with Castrol SRF.

People told me that all I have to do is bleed the front (both caliper and master cylinder) and then bleed the rear. I just want to make sure that I don't leave old brake fluid in there and bleeding front and rear logically seems to miss fluid that would be on the circuit that activates the rear brake when you pull the front brake. I tried to see if the rear wheel would stop when I pull the front lever and it doesn't (with the bike on or off).

Any advice would be appreciated.

When I changed my master cylinder to the Brembo Rcs I just drained all the fluid out of the reservoir and drained as much as I could out, the only way to know if you got all the old stuff out is to run a different color like the ate blue brake fluid and switch from gold to blue, but I heard it stains your reservoir a little.

Just see how much you can get out, but a little left in there wont hurt your performance, I have done 3 track days and didn't have any fade the first time I went out with the stock master cylinder and brakes, so I don't think it will be a huge advantage, but I'm not Rossi either lol (but i do high 30s at fontana) so I'm not that slow either

if you want to get it all out I would drain it and then ride it around for like 15 -20 mins and then drain it again


hope this helps,
Sl8R

[dePunietS1000RR]

Originally Posted by Sl8R

When I changed my master cylinder to the Brembo Rcs I just drained all the fluid out of the reservoir and drained as much as I could out, the only way to know if you got all the old stuff out is to run a different color like the ate blue brake fluid and switch from gold to blue, but I heard it stains your reservoir a little.

Just see how much you can get out, but a little left in there wont hurt your performance, I have done 3 track days and didn't have any fade the first time I went out with the stock master cylinder and brakes, so I don't think it will be a huge advantage, but I'm not Rossi either lol (but i do high 30s at fontana) so I'm not that slow either

if you want to get it all out I would drain it and then ride it around for like 15 -20 mins and then drain it again


hope this helps,
Sl8R

Thanks for the answer. My question is more about the ABS circuitry. I've changed brake fluids on bikes where the front master goes directly to the front calipers and I'm fine with doing that.

On the S1000, the brake line form the M/C goes to the ABS box, then from what I understand, some of it goes to the front calipers and some of it under certain circumstances got to the rear brake (linked braking).

I am assuming that bleeding the front, then bleeding the rear will take care of the front M/C to front calipers as well as the rear M/C to rear caliper. But what about the circuitry that sends from front M/C to rear caliper. Is it all in the ABS box, should I worry about it ?

[poiteau]

Hello,

The BMW workshop manual mention the hereunder bleeding procedure (front brakes) :
1, proceed bleeding at the master cylinder
2, proceed bleeding at the left caliper
3, proceed bleeding at the right caliper
4, proceed bleeding at the master cylinder again

Same procedure for changing the fluid. Using a manual push bleeder (syringe) at calipers can be quicker.

For the rear brake, make bleeding at the caliper.

In fact the S1000RR ABS has no impact on the traditional bleeding procedure except the volume of fluid due to the longer pipes and ABS control unit.

[viperclaw]

They are seperate fluid tracks--front and rear. Any intigration is electronically controlled internally, probably an electronically controlled plunger.