We are having problems with pulsation in the front brakes. Replaced rotors with new OEM rotors, after a while the rotors were warped. we are sensitve to this problem so we don't over heat the brakes.
Question, I repared this problem on a 124 4-Matic by using cross driled rotors. Are there any avalible for the 123?


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How are you determining that it is the front rotors that are warped, and not the rear?

A warped rotor at any corner can cause pedal pulsation.

I have not seen any crossdrilled rotors. If they cured your problem, it was probably because they were new.

Good luck,

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Larry Bible
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles

Are you torquing your lug nuts with a torque wrench? Most shops use "torque sticks" on the end of an impact wrench. I really doubt a torque stick really gives you an accurate torque on the lug nuts. Some cars are really sensitive to this, so I would recommend torquing them yourself - rarely can you trust a shop to go to the trouble of using a torque wrench.

Greg

My original 123 Brake Rotors went over 500,000 highway miles before replacing the fronts, the rear ones are original. The fronts were okay, but getting thin and replaced out of convenience when getting an entire front end from low mileage parts car. I never experienced a warped rotor on this car.

I have never used a "torque wrench", however, I always hand tighten with the factory lug wrench in a five cornered star pattern. I put the same weight on them and torque them as evenly as I can with the lug wrench. The times when I have used a tire store where I don't put the wheels on myself, I actually loosen and "retorque" the wheels with my lug wrench on the parking lot before driving away and heating the rotors.

This technique has worked well for me. I own a very nice torque wrench, but the above has proven to much more convenient, and I think has also proved adequate.

Good luck,

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Larry Bible
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles

500,000 miles on a set of rotors . . . Wow !

Note that I said HIGHWAY miles. I drive more than 95% on the highway at cruise.

Larry

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Larry Bible
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles

For a custom set of cross drilled rotors try:
http://www.brakeco.com/hi-performance.htm

I have not ordered from them. A freind recently priced a set of custom cross drilled for his Volvo, which he could not find anywhere - they priced out at slightly less than $100.

Good luck