Just changed my brakes and I have a few questions. - Mercedes-Benz Forum
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post #1 of 15 (permalink) Old 05-02-2011, 10:10 AM Thread Starter
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Just changed my brakes and I have a few questions.

I just changed my brakes (Dealership brakes) due to the brake pad indicator light coming on whenever I brake. So I decided to buy Akebono ceramic brakes to lessen the brake dust. Anyone have any opinions or experience with Akebono brakes?

The rear rotor's depth was fine. The front rotors are different. I'm not sure if the front rotors have a groove on the outer rim which makes the inside part (where the brake pads hit) about a little over 1/16" deep but not as far as 1/8". Is that normal for the front rotors? Or should I replace them?

I also decided not to bleed the brakes after replacing each pair of brake pads. Should I have bleeded the brakes? What are the advantages or disadvantages of bleeding the brakes after installing new pads?

After I have placed the brake pads, I took it for a test drive and the brake pedal feels softer than before. They also squeek when going in reverse. Would it be because they are ceramic brakes? Please give me your opinions.

Thanks.
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post #2 of 15 (permalink) Old 05-02-2011, 10:33 AM
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Did you measure the rotors? I'm betting you need to ones. You always want to replace and bleed brake fluid when you replace the brakes. And repack the bearings, I haven't touched my car yet so i'm not sure if we have any. If/when you replace the rotors you need to hit them with brake cleaner before installing too
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post #3 of 15 (permalink) Old 05-02-2011, 02:24 PM
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YIKES ! Replace brake fluid every 3 years regardless of brake pad use. Not every pad change! Hub bearings depend on ware, but I've got 156000k miles on mine and probably due for its first change. Rotors, unless they're warped are probably good thru these pads. No need to bleed brakes to replace pads. Might want to try some brake quiet on the pads.
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post #4 of 15 (permalink) Old 05-02-2011, 04:07 PM
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+1 with cacecef - had Akebonos now for over a year (with new rotors) - no problems - no noise and similar to OEM in feel - AND NO DUST!
Note - they came with lube for the back of pads - did your dealer use the lube?

I think its normal for a spongy feel until the pads are fully bedded into the old grooves in the disc - also a good idea to deglaze old discs to get rid of surface 'polish'

When you get a vibration when braking at speed, you can be almost certain that your discs are close to minimum thickness and starting to warp - if you have a sixteenth inch ridge you are getting close - discs are not too expensive - ATE make a grooved disc that tells you when you at minimum - 'bout $60 Tirerack from memory?

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post #5 of 15 (permalink) Old 05-02-2011, 05:07 PM Thread Starter
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After 1 day of driving (20~ miles), I see orange streaks on the stock rotors. I've never seen that before, maybe it's from the ceramic pads? Also the brakes squeak usually for the first few applications of braking and right when I reach my destination. I did put the vibration solution where the calipers meet with the brakes.

I am planning on replacing the rotors next weekend. I am probably going with brembo rotors for the front. I can't find brembo rotors for the rear online anywhere or if brembo rotors are even sold for the rear.

I will also probably look into replacing my brake fluid. I need to find a DIY somewhere on this forum.
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post #6 of 15 (permalink) Old 05-07-2011, 09:56 PM
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If you use old rotors with new pads, it will squeal until the edge has worn away the pad so that the pad conforms to the shape of the rotor. Only at that stage will your braking improve and the squealing stop. May take in excess of 1,000 miles.


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post #7 of 15 (permalink) Old 05-07-2011, 10:45 PM
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A good rule of thumb is to make sure you have all your questions answered before you start a job.

Eyeballs are useless for judging rotor wear, that's why they make micrometers and stamp the minimum thickness into the perimeter of the rotor. If you are going to reuse them any lip should be cut off (or it's likely to rub the edge of the new pads and cause harmonics and vibration) and it's a good idea to deglaze the face of the rotors with some emery cloth. Hopefully you won't have too badly misshapen the pads with the old rotors.

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post #8 of 15 (permalink) Old 05-08-2011, 08:56 PM
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Quote:
Originally Posted by cacecef View Post
YIKES ! Replace brake fluid every 3 years regardless of brake pad use. Not every pad change! Hub bearings depend on ware, but I've got 156000k miles on mine and probably due for its first change. Rotors, unless they're warped are probably good thru these pads. No need to bleed brakes to replace pads. Might want to try some brake quiet on the pads.
Do you have a source on the 3 years statement? I've never heard of anyone replacing fluid when it's not low...only time it gets low is when the pads are worn or from leaks... I had 6 years/76k on all my Silverado brake components which all worked fine up until 74k..brake fluid was clear.

He never mentioned what year/model he had and the mileage on it.

You need to repack bearings on all cars every 30-60k miles or they will burn up.

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post #9 of 15 (permalink) Old 05-08-2011, 09:09 PM
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Source for 3 year interval for brake fluid changes? The maintenance book that mercedes gives you with your car says every two years-time dependent, not milage.
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post #10 of 15 (permalink) Old 05-08-2011, 10:29 PM
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2 years is what WIS says. its time dependant not kms. regardless its cheap and easy to do as brake fluid absorbs mosture from the air lowering your fluids boiling point... leaving it in there too long can start corrosion on your ABS pump and other brake parts

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