Change rear pads? - Mercedes Benz SLK Forum

Tires, Wheels, Brakes & Suspension Discussion and information regarding tires, wheels, brakes and suspension.

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#1 Old 06-11-2018
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Change rear pads?

My rear pads are about 70% worn and my car seems to have developed brake squeal at low speeds. At 70% worn will I still have maximum braking? Do you think it's worth changing the pads?
My annual mileage is around 2-3k miles per year.

Thanks!
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#2 Old 06-11-2018
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Speaking as a layman and NOT a mechanic:

I can only address the squeal--my '55 did it from (almost new--bought car used) and still do 2 yr later with plenty of life left. It's more irritating than safety-related.

I assume from your question that you are not going to change them out, rather going to an indy. Most will do a free inspection as it has you concerned.
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#3 Old 06-11-2018
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Thanks Leo. Would you change pads at 75% or leave them longer? I want the best possible braking.
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#4 Old 06-11-2018
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The braking is fine with worn pads, but be sure to check the inside pads too. Sometimes they wear at different rates. If you are 75% gone on the outside you may be 90% on the inside. They also may not be completely evenly worn across the pad. If you still have pad left, you are fine, but it will get expensive fast if you don't and toast the rotors.
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#5 Old 06-11-2018
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Originally Posted by bensslk View Post
My rear pads are about 70% worn and my car seems to have developed brake squeal at low speeds. At 70% worn will I still have maximum braking? Do you think it's worth changing the pads?
My annual mileage is around 2-3k miles per year.

Thanks!
As a guide, the UK MOT minimum requirement on each pad is 1.5mm but you would get strong customer advisories at 3mm (and I'd change mine at this point). As far as braking performance is concerned, if there's an even surface of friction material, your stopping distances should be unaffected.
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You may get another 1000-2000-whatever km out of them. BUT if you decide to wait a bit and start hearing metal-on-metal and not just that squeal, well you've waited too long and and you're now looking at possible/probable rotor resurfacing as well.

Like I said, get them looked at by a pro at an indy you trust


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#7 Old 06-11-2018
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The thing about the rear pads is that they only apply about 25% at most, of the total braking force - mostly to aid stability. Accordingly, you'd expect to replace your fronts four times more frequently and you'll expect to get 4x the mileage from a set of rears. They wear very slowly - that is, unless they start to bind. After a drive, jump out of your car and touch each wheel. The fronts should be warm to hot - the rears, barely warm. The important thing is that each axle should feel the same. You might get a more accurate feel by touching the calipers - but don't touch the discs, you'll burn your finger!
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#8 Old 06-12-2018
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Thanks for the advice guys. I have 4mm of material left, so hopefully should be ok for a couple of thousand miles.
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#9 Old 06-12-2018
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^ As a guide, a new Pound coin is 2.8mm thick, the old one 3.15mm.
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#10 Old 06-13-2018
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If Your planning to keep the car, always best to replace sooner, rather than later....

The one thing I was told was the the thicker the pads, the more heat it can store/take - so if You did a emergency stop from (Hmmm) say 70mph, it would fair better...??
This probably more relates to the front brakes though..!!
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