vibration when braking hard - Page 2 - PeachParts Mercedes-Benz Forum

Knightrider966 · #1 11-30-2007, 02:38 PM

Quote:

Originally Posted by 123Guy

MB recommends no turning - MB rotors are relatively thin and this makes the rotor to thin and dangerous

If they are really warped, I'd be hesitant to do so, but if the thickness is within specs, then this is ok.

(Totally German Auto, Phoenix.) Any reputable shop will tell you if these are to thin to turn anyway.

I'd still get genuine or approved replacement parts and Chinese rotors are neither! The only thing they are guaranteed to do is fit.

gsxr · #2 11-30-2007, 02:56 PM

Brakes are safety items - don't cheap out on them. OEM rotors are NOT expensive. Buy new rotors, end of story. They're a whopping $28 each for Balo rotors at ***************, or $34/ea here at MBShop (link at top of page). They're a PITA to replace on the front of a W123, though. Use the OE/dealer neon-green wheel bearing grease if possible (it's not expensive), and do NOT mix grease types. Don't forget to order new grease seals, and use a dial indicator to set the wheel bearing end play (the spec is stupidly tight, 0.01-0.02mm, or something like that.)

Another option is to upgrade to 560SEL brakes, which are vented... the 123 has solid front rotors, which are a little undersized for the weight of the car.

Knightrider966 · #3 11-30-2007, 03:00 PM

Quote:

Originally Posted by gsxr

Brakes are safety items - don't cheap out on them. OEM rotors are NOT expensive. Buy new rotors, end of story. They're a whopping $28 each for Balo rotors at ***************, or $34/ea here at MBShop (link at top of page). They're a PITA to replace on the front of a W123, though. Use the OE/dealer neon-green wheel bearing grease if possible (it's not expensive), and do NOT mix grease types. Don't forget to order new grease seals, and use a dial indicator to set the wheel bearing end play (the spec is stupidly tight, 0.01-0.02mm, or something like that.)

Another option is to upgrade to 560SEL brakes, which are vented... the 123 has solid front rotors, which are a little undersized for the weight of the car.

Interesting about the 560 SEL brakes. what would be necessary for an exchange and retrofit? Just putting these on in place of the originals?

spugeddy · #4 12-03-2007, 12:31 PM

Quote:

Originally Posted by gsxr

They're a PITA to replace on the front of a W123, though.

Some people say easy job, some say hard.

I'll probably do a lookup here unless someone can elaborate?

spugeddy · #5 12-12-2007, 04:08 PM

Got my baby back, and the braking is oh so smooth.

Two new rotors, new seals, and labor around $200.

Magoo · #6 11-30-2007, 03:32 PM

Quote:

Originally Posted by spugeddy

Noob question, but when I brake from higher speeds (like 45-55) and a good amount of pressure on the pedal I get some pretty bad vibration throughout the car.

I got new front brake pads almost a year ago, put on by a local shop here, but they didn't mention the rotors needing replaced.

I have just had a lot of work done recently so I want to not take it back, but can I assume I have a warped rotor, or worn down rotor... is there any other thing that it could be....

when I softly apply the brakes I get no vibration...

I can get the rotors for about $50 shipped, but is this a job a novice can handle. I have only done brakes once with my Dad, but I have a friend who is more experienced than I am....

Check the rear brakes and rotors. I recently replaced the front pads and rotors on mine which helped alot, but still have some vibration and oscillation apparently caused by the rear rotors.

In my case, it can be seen on the rotors in the form of heavy rust pitting from a combination of the car sitting alot and the calipers being partially setup. The rotor surface is visibly worn unevenly and varies from smooth to rough on it's faces. Normally though, it's not very obvious when they are "warped".

spugeddy · #7 11-30-2007, 04:34 PM

I swear it is coming from the front passenger side....

I just feel it like that....

spugeddy · #8 12-12-2007, 12:53 PM

It turned out to be a warped rotor, and so they are replacing the front two....

$150 labor! JC.

I understand it is a little different on a W123 (more labor) to change the rotors, so I will be happy with a smooth braking experience today on my ride home.

Merry Christmas to me.