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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > How do you know when your brakes are broken in?



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      08-16-2011, 10:26 PM   #1
RicheyBMW
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How do you know when your brakes are broken in?

During the "engine-break-in-period" (about 1,200 miles) is it okay to do some hard stops? I've been riding very gently for about the first 700 miles. Until today, I did some occasional full throttle then hard stopping (maybe like two or three times). I hope I didn't hurt anything. I know I'm probally just being a bit paranoid. But what are yall thoughts?
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      08-16-2011, 10:33 PM   #2
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You're fine. I just put new brakes on my truck and took it out to do a few 60-0's. No harm done man!
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      08-16-2011, 10:56 PM   #3
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Im no expert, but thats not a prober bedding procedure. You shouldnt brake hard till stop. your brake pad will leave imprint on your rotor and you'll have uneven brake material coating that might cause vibration in the future.
Do 60-20 or 80-20
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      08-16-2011, 11:02 PM   #4
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I actually didnt do any complete stops. Just hard breaking from a fast speed.
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      08-16-2011, 11:05 PM   #5
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as a rule, avoid extremes. i dont think our brakes will be damaged from few hard stops but if you do that day in and day out it will take its toll at this mileage. moderation until few thousand miles my friend.
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      08-17-2011, 11:40 AM   #6
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Since you took it easy for 700 miles, you should be fine.

http://www.tirerack.com/brakes/tech/....jsp?techid=85

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      08-17-2011, 01:50 PM   #7
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Quote:
Originally Posted by RicheyBMW View Post
I actually didnt do any complete stops. Just hard breaking from a fast speed.
No problem - your brakes are designed for this. But be aware that when the brakes get really hot you run the risk of developing brake judder caused by brake pad material being smeared unevenly across the face of the rotor. Brake judder is a vibration that you would feel when you apply the brakes. People poften mistakenly refer to this as "warped rotors," but that's a misnomer - rotors almost never get warped, but brake judder is quite common for people who use their brakes really hard (like at the track). To avoid this after using the brakes hard let them cool by driving at a steady speed without applying the brakes (or as little as possible), such as on a highway or country road without stop lights. And when you park the car do not set the parking brake. Take these precautions and you should have no problems with the brakes, even if you use them hard.
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      08-17-2011, 01:59 PM   #8
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Quote:
Originally Posted by RicheyBMW View Post
During the "engine-break-in-period" (about 1,200 miles) is it okay to do some hard stops? I've been riding very gently for about the first 700 miles. Until today, I did some occasional full throttle then hard stopping (maybe like two or three times). I hope I didn't hurt anything. I know I'm probally just being a bit paranoid. But what are yall thoughts?
That is an easy question! Answer: when you stop hitting the back wall of the garage.
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      08-17-2011, 07:00 PM   #9
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Will you be doing the install yourself? Majority of the manufactures tend to apply a light sticky film covering the front and back side of the rotors. The reason for this film is for the protection from rust during the down time that the rotor sits on the shelves till it is bought and installed by the consumer. The amount of time could be a couple of weeks to several months so during the down time, rust could accumulate which is why that film is there to protect the rotor from rust. The easiest way to clean this film right off is to spray the rotors with a can of brake cleaner. If you leave this film on, when braking in the brakes, you'll notice a burning smell from your brake pads/rotors.

As BMWPride335i said, "...avoid extremes..." Gradually apply the brakes from 60 to 20 and do this 2-3 times. If you apply the brakes at a high rate of speeds in hopes to stop within a few seconds after installing brand new pads and rotors, what will happen is a process called "glazing." In simplest terms, there's going to be a microscopic crystallized friction material on the pad surface and the brake rotor. When this occurs, you'll experience poor stopping distance, vibration while braking, or even worse, hairline cracks on the pads and rotors itself.

Just my two cents. If you have any other questions please feel free to contact me at **********s.

- Glen A. C.
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      09-07-2011, 09:26 AM   #10
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I've always used StophTech's procedure found here. Has worked very well on all of my cars, hope this helps!
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      09-07-2011, 11:50 AM   #11
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Wow too much bad advise here. If you bed your brakes in properly, they are good to go. I've even tracked my new pads the same day they were bedded

Here's a good bedding method from Cool Carbon:
http://www.coolcarbonperformance.com/bedding.html
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