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Old 07-25-2005, 12:20 AM
ACM ACM is offline
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Question Brakes questions 1988 300E 124.030

1) I was replacing the brakes today and also measured the thickeness of the rotors. I do not have the MB numbers, but here is what my vernier caliper showed me.
Rear rotors: 8.80mm and 8.85mm (that is millimeters).
Front rotors: 20.5mm both.
Can anybody tell how do they compare to the original MB numbers?

2) I found out that there are dust covers inside the wheels but only the rear ones. Shouldn't the front ones have dust covers too?

3) What is the torque specification for the lower bolt in the front calipers? (the one that must be replaced).

4) What is the torque specification for the wheel lugs all around?

5) I bought Textar brakes for $45 front and $28 rear plus $4.50 for each wear sensor. Are these good prices?


Thank you very much and sorry for the many questions!
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Old 07-25-2005, 01:33 AM
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Torque spec

Hi ACM,

A partial response:

1. Wheel bolt torque spec. is 110nm

2. Usually dust covers only used on front wheels - as front brakes are the most prolific dust producers. I would just switch them from back to front. Also, make sure that when you have your wheels balanced, that they balance them with dust covers installed. It makes a difference!
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Old 07-25-2005, 01:52 AM
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Mercedes conciders those wheel brake dust inserts to degrade brake cooling and do not advise installing them...What ever

Anyway.......all thicknesses of brake rotors...

: New :9mm/12mm/22mm.

Wear limits :7.3mm/10.5mm/20mm.

Caliper lower self locking bolt : 35 Nm.


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Old 07-25-2005, 02:52 AM
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Brake pads: I only use PBR Deluxe (Very low dust, anit-squeal) on all the cars.

Wheel bolt torque: I torque my wheels at 86 ft/lbs. (Especially after doing ANY disk/hub work, I re-torque after driving a few miles. I always use the criss-cross tightening pattern. I never tighten one bolt untill all are cinched up).

Dust covers: There have been MANY discussions on this site on the pros and cons of dust covers. Personally with the use of the PBR pads I prefer getting as much air around and through the wheels, disks and pads as possible. I typically get 40k+ miles out of set of from pads.

Tip: If you want more air into the brake area, remove the blocks under front lower bumper (may only apply to '90 and later cars). The area looks like a rectangular section that a fog light might have been installed at.

PS: Make sure the new disks are ULTRA clean. No spots or residuals of grease etc.

Haasman
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Old 07-26-2005, 04:44 AM
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Thumbs up

thanks guys,
I appreciate your comments.
They are all very helpful.
I will let you know how the Textars perform.
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