E92 hydraulic handbrake7/30/2023 ![]() This is for safety so that if pressure is lost in half the system, you still have braking in the other half. The cylinder is divided into two separate hyrdraulic control zones, front and rear. If neither of these, it is possible you have a fluid problem in the master cylinder. If the brake is released, check the cables and the e-brake mechanism to see if either of them are stuck and leaving the e-brake on or partially on. Normally I check the handbrake first as this is the easier check. Indicates you have a loss or imbalance of fluid pressure from front to rear or vice versa In most other cars, the brake light performs two functions: A spare non OEM sensor cost me like $12 at FCP. So if you perturb that sequence and not reset the CBS and the Brake Wear System (by using new wear sensors) you get things fucked up and the system reports erroneous information. The system uses a algorithm of a predetermined wear rate along with the real wear rate as determined by the sensor wear rate (the 1st wire loop breaking) to provide an estimate of the miles remaining on the pads. This is why whenever you replace brake pads on a BMW you replace the sensor and reset the system. However once the 2nd wire loop breaks and the "Brake" icon comes up, one or both sets of pads are worn out and need replacement.īy trying to reset the CBS you are just confusing the logic built into the software. The sensor is dual-stage so as to provide an actual wear rate of the pads, which allows the CBS to estimate the remaining miles left on the pads. It does that so you know which axle needs new brakes. When that happens the CBS menu will show either the front or rear axle at - miles left on the brake pads. The second stage is when the second wire loop in the sensor breaks which triggers the red "Brake" icon. The sensor is dual-stage, which means it wears halfway through and records the event in the CBS computer (a loop of wire imbedded in the sensor breaks). The CBS keeps track of the wear rate of the pads by the wear on the sensor. OP, it is most likely that your pads are actually worn out and the brake system is telling you so. Then plug the old/worn/broken sensor? Won't it automatically trip the service light again? So you're saying just unplug the old sensor, plug in the new one then reset the service indicator. and hopefully, it will allow me to reset and turn off the brake warning light. I will replace both front and back sensor. I'm thinking I'll just replace the sensor and reset the service and give myself another 5k miles before considering new pads and rotors. So if you let the pads get too low then you jeopardize wearing grooves in the rotors thus causing the need for replacement. Not sure how much truth there is in this but I was told that the sensors are designed to show more wear than necessary because when the car is under warranty the stealership wants to just replace the pads and not the rotors. The sensor has to be replaced before the light will go off. Took car to my Indy shop for professional opinion and was told that pads are only worn half way. Personal inspection shows plenty of pad left. I'm dealing with the same thing right now.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |