BMW Luxury Touring Community banner
1 - 1 of 1 Posts

· Registered
671 Posts
The front reservoir holds the fluid that enables the control circuit, while the rear reservoir holds the fluid that actually presses on the brakes. So, as the pads wear the rear fluid goes down. And, the float is quite sensitive to loss of fluid. A teaspoon makes a difference.

The front fluid control circuit is a trapped or closed loop with no loss, except for a leak or failing component.
1 - 1 of 1 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.