[s-cars] S6 Brake Master Cyl

[dgraber460 at aol.com]

Well here is the latest on my ongoing ’95 S6 brake saga.

The pedal has been softer than should be for over a year. The brake light has been a pest for years gradually staying on longer, but of late has been staying and coming on even more frequently. The light now comes on with any change in g-force – either forward (acceleration), back (downshift), up, down, or side to side. This is without any input from pedal or steering wheel. Potholes and jarring do not trigger the light. The chassis has to actually change direction, which leads me away from loose connections. Input from the steering or brake will also trigger the light as well.  I have flushed the system twice, replaced the bomb and pump, and the anti lock wheel sensors – no change. The fluid level is above the reservoir marks at rest and when running. I get 44 pumps to hard pedal after shutdown. Lately on brake application it will give braking, vibrate slightly as if the anti-lock kicked in, go farther down another ½” and continue to brake. This is on completely dry road. The anti-lock system works to spec on snow and ice.  

My logic tells me it has to be the servo, but at $500-700, I would like to be sure.

TIA for any guidance/suggestions and BTDT.



Dennis Graber
Denver, CO
720-838-0558