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We use a power bleeder. It does have a pressure gauge for the air going into the top (air) chamber. We usually go up to about 30 psi or so, but again, this is the air pressure in the top chamber. I am not sure if this is an accurate reflection of the pressure being exerted into the brake fluid reservoir.
For some reason, the 23.0 front and 13.0 listed on the rotors strikes me as being the service spec. Usually the minimum spec is stamped into the rotor, and the service spec is in the manual. Maybe I can look at a new rotor tomorrow. An aftermarket shop could possibly get the rotor specs from an subscription service such as Mitchell On Demand. Or if it an MB specialast aftermarket shop, they can get it off of WIS or they may have the maintenance manual (#4) which lists them.
This is how it's supposed to work:
If the rotor is above the service spec (the "thicker" measurement), then the pads are simply replaced. If they are below the service spec, and the pads are being replaced, then the rotors are replaced. Simple as that, really. The Minimum spec is more of CYA for Mercedes. The use of worn out pads and below Minimum spec rotors can be a hazardous combination as far as overheating the brakes. Don't machine the rotors, it is not needed. In general, I see that a new pair of rotors should last through 2 sets of pads. So you'll have a new set of pads and rotors, wear out a set of pads and replace just the pads, then when those pads are worn out, you'll be ready for the rotors again. That's the usual pattern.
Also in regard to what is stamped in your rotor, it really should have some type of descrption preceeding the measurement. It usually is stamped "Min Thickness XX.Xmm", or "Min. Thick. XX.Xmm". This would be minimum thickness, not service spec. I'll post what I have listed for service spec and Min Thickness for an ML320, and what is stamped on a new rotor.
Gilly
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