Why the BMW 325i Brake Disc Fails
Why does the BMW 325i brake disc fail? Well, this part doesn't last for a lifetime. Sooner or later, it will fail and you have no choice but to replace it in order for you to have a safe journey at all times. But, you wouldn't want it to malfunction right then and there, would you? Find out the signs and symptoms of a faulty brake disc by reading these troubleshooting tips.
As you drive, take note of any unusual sounds that are coming from the brakes. A worn-out brake disc makes different noises, but either way, it could mean that they need to be replaced. Overheated brake pads make squeaking noises and can be often heard during slow stops. If you hear swishing, howling, or grinding noises, it means that the brake disc pads have gone past their lining limits. If you don't have these replaced, you'll be hearing any of these sounds whenever you hit the brake pedals and you'll sense a slight vibration in the steering wheel.
Grooved brake disc
Study the brake disc; a good one should look clean, smooth, and shiny. If you see deep grooves that appear as parallel lines, it means that the surface of the rotor has been in contact with the pad rivets and this could show extreme wear for a long time. If your brake disc rotor has deep grooves, it can cause brake shimmy or even lock up. You'd also start to hear incessant loud grinding noises when you hit hard on the brake pedal.
Contaminated brake fluid
Lift the hood of your BMW325i and take out the top of the brake master cylinder; be sure to follow the instructions on the manual so that you won't have a hard time. Check the fluid level on the reservoir. Take note that the correct fluid level should be indicated on the cylinder and is in accordance to the one on your manual. If the brake fluid is contaminated, it will also affect the performance of your brake discs. Be sure that this is clean; otherwise, you're going to need new brake fluid.