[vlad273]

Hi comrades!

Could you help me with a problem. I'm from Russia. I live in Moscow. I have the problem with brakes on my LT 02 lights are flashing at 4hz, in manual I' ve read that it is problem with abs unit. The first time it happend while I was riding. After that I went to the service where serviceman changed the pump of front brake, then he changed the sensor in abs unit. And now sometimes this failure appears when I switch on ignition while bike stand on side step if bike stand on central stand ore vertically it is no failure. Have you any ideas? We don't know what to think((((

 

[rattler50]

Check the fluid level in the reservoir under the rear seat. It's probably low.

 

[mreuter]

+1
If you have the bike on the CS the fluid level is a bit different as on the side stand. That could cause the alarm.

Manfred

 

[vlad273]

fluid level in the reservoir under the rear seat is normal. When you have a low level, lights are flasing at 1hz. In ma case lights are flashing at 4 hz.

 

[mreuter]

Worst case would be the abs unit them self.
But this is repairable, look it up at google if you need it.
First at all I would change the liquid in the hydraulic circuit if they can't find anything else at BMW, maybe you have some air in the system / pump.

Manfred

 

[vlad273]

Who knows where I can find instruction how to delete air from system? I found at forum how to change braike fluid, but didn't find how to delete air(((( In instruction is said about Repair Manual. Where I can find this manual. I have a repair manual for LT 99. But there is another brake system.

 

[mreuter]

Take a look of the Threads from today and yesterday there you will find more.

Manfred

 

[jzeiler]

The rear reservoir on your 02 has two chambers. The front one is for the rear brake and the rear one is for the front brakes. To bleed the wheel circuit you can get a long piece of tubing and run it from the front caliper back to the rear chamber on the reservor. Open the caliper bleed port and turn on the key and apply the brakes. The fluid will circulate in the hose back to the reservoir and run that until all bubbles are gone. Just make sure the reservoir never drops below the bottom. Same for the rear brakes only the tube goes to the front half of the rear reservoir.

The control circuits are done with the key off. Rear control is fed from the front half of the rear reservoir and you draw off the fluid on the long bleed nipple (inboard) on the ABS unit. manually pump the pedal and draw from the tall bleeder, keep the reservoir full. The front is fed from the handle bar reservoir and drawn from the tall bleed port on the ABS unit (outboard).

 

[vlad273]

Thanks for the answers.

I have 6 nippels on my ABS unit. What is succession of bleeding them? After blleding in service i had a failure only in side step. I rode about 200km and now failure always appears and it doesn't depend on what stand bike is. I suppose that I have an air in the system. May be somebody has a sheme of this system? I don't exactly understand how it works((((

 

[jzeiler]

The six on the ABS are for just the control circuit so unless your lever is spongy they should be OK. I have the sequence at home and will post it tonite.

 

[vlad273]

Does anybody know where I can find ABS Pressure modulator unit 34 51 7 685 803?. In service say that in my unit has broken contol module. I need used one. Because new is very expensive. May be someone has this unit broken, but with good control unit? I have friends in Milwaukee. If you sell it to me, you send it to Milwaukee and they send it to Moscow.