2 brake problems...or maybe 1!

[AndyS]

This was a good weekend for doing a service on my 2003 R1150RT.

 

Well, it was until I got to flushing and bleeding the rear conrtrol cct.

I am getting a constant supply of small air bubbles running up the bleed pipe with every push of the brake pedal.

It doesn't matter which of the 3 bleed nipple I am on, bubbles are still present. (The front cct bled out beatifully).

 

So, I thought I would carry on with the remainder of the service and come back to the brakes. However this is where problem 2 appears.

 

I reconnected the Electrical connectors to the top of the Brake unit. Turned the ignition on and I get a constant High frequency flashing of the light.

(General warning lamp ON, ABS lamp flashes at 4Hz =At least one brake circuit in residual braking function mode)

 

The Servo works fine on the front brake cct, but when the foot pedal is pressed down.....no servo at all.

 

Any ideas whats up?

 

Andy

[ianboydsnr]

Your allways going to get the bubbles, its drawing the air through the bleed valve threads, have you topped up the servo with fluid?

[AndyS]

Your allways going to get the bubbles, its drawing the air through the bleed valve threads, have you topped up the servo with fluid?

 

Thanks Ian,

Maybe it is the threads but I would be suprised if it did it on all three, because it didn't do it on any of the other bleed nipples - only the 3 rear control bleed nipples.

 

And on the Servo, yes I drained and refilled the front and rear wheel circuits (no air bubbles from them either).

 

Andy

[philbytx]

The back is a bugger DAMHIK!! In my case, I just used SpeedBleeders and cracked the bleeders a "smidge" to bleed! If you power up the iABS unit, the pedal is nicely "up" and the rear brake operates, you should be just fine. It should all come together when you fire it up and ride it long enough to get the sensors involved

[David R]

IF you have to, push the pedal down with the bleeder closed. Open the bleeder and let a small amount of air/fluid out. Repeat as many times as needed. Hose still attached.

 

With the bleeder open it can draw air back in through the threads when you let up the pedal.

 

Brake bleeding 101.

 

David