Rear brakes hotter than front brakes
MBWorld Fanatic!
Joined: Sep 2014
Posts: 1,173
Likes: 431
S600
Are rear brakes supposed to be hotter than front brakes? I thought it would be the other way around. Occasionally I get a moderate brake shudder when decelerating. It's only happened around 3-4 times over the last 6 months or so. But this last one was more severe than the previous. I looked at tire temps through the dash board, my car is a 2018 S63 sedan, last time this happened and they all looked in the same range. But this last time I used my digital thermometer. On both rears I saw close to 200 degrees farenheight around the inner edges of the rotor faces, and around 120 on the outer edges. On the front brakes they were at 120 degrees on the inner edges of the rotor and around 90 on the outer edges. Ambient temps were in the low 50's, or high 40's, with light rain. I did a nice 0-100 pull in a tunnel after dropping my wife off at the airport just to hear the exhaust. it was fun! But when braking from that speed down to around 35 is when the shudder happened. I checked the rotor temps within 5 minutes and 3 miles from when it happened.
What's going on???
What's going on???
b) Stability control uses rear brakes to stabilize the car (but not the front)
c) Distronic uses the rear brakes to slow the car.
So, given that it is not hot-- ...
