Dear all,

Once again for the second time -the first was last year-- I have this exclamation mark sign on. I have searched on the owner's manual it says the sign indicates hydraulic-brake issue. Last year I replaced all four (front & rear) caliper rubber seal and it indeed solved the problem.

This time however is different. I have recently replaced all four discs, brake-pads, and brake fluid. The system worked fine for couple of days before the sign on. Although I have dismantled front caliper: clean the piston and the seal it just didn't turn the lamp off.

Any advice on this? Should I replace the caliper seal which makes me wonder it was good for a year only? Thanks for the response.


Enrico Tobing

528i E39 1997
Automatic ZF 5HP18