Are there sensors on the rear brakes?

When changing the rear pads the other day on the '85 300TD (wagon) I noticed no sensor wires to be replaced. And the pads had no hole for a sensor wire like the front brake pads have.

If no sensors on the rear brake pads I'm curious as to why just the front...?

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JWJ
1983 MB 300D - > 430,000 miles - Deep Blue - Bilstein Comforts - 0-60 in 24 seconds - 27MPG
1985 MB 300TD (wagon) - > 275,000 miles - Manila Beige - Thule rack - 0-60 in 18 seconds - 22 - 25MPG
Biodiesel, Mobil Delvac 1, and Viton fuel lines!

only ones that matter.

Later cars have them on the rears too.

Len

I can only guess it's because the fronts do the majority of the braking.

Typically, you replace 2 sets of front pads for every one set of rear pads.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D

All of these responses are correct. When the light goes on for the fronts, change the front pads and inspect the rear, if they are at all thin, change them at the same time. It will only cost a few more dollars and are done very quickly.

BTW, ALWAYS replace pads one at a time always leaving at least one pad in the caliper while compressing the other piston back into the bore. Removing both pads at the same time and THEN compressing a piston can push the other piston out past the edge of the seal requiring caliper disassembly.

Good luck.

The rear pad are usually smaller too, since they don't wear as much.

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Because the rears last well over 100k miles usualy. MB added sensors to the rears on the later models, I suspect because the traction control wears the rear pads much faster.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Especially if Jeremy Clarkson of Top Gear is driving the car... He probably goes through a set of pads in one day!

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

As Larry had mentioned...change front and inspect the rears. The brake bias
on most cars including Mercedes is 60/40 front to back......fronts are going to wear at least 30% faster. If you see very little or uneven wear on the rear pads be suspecious of a seized brake piston.

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FRED

Daily Driver: 98 E300TD 199K
Hobby Car: 69 Austin Mini
Past Diesels: 84 300SD, 312K
87 300SDL, 251K
94 Chev. K-1500 6.5Ltr.TD, 373K

In the snow you chew them up, can't be helped. I know ML's that people use in the snow a lot can burn through a set of rear pads in as little as 5k miles.

Traction control clamps the rear brakes on when it engages, on some cars thats a lot...

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200