Brake bias - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 03-06-2014
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Brake bias

As you know all my spianners are left handed

I noticed after all the rain we have been having over here that my front brake discs were dice and shiny but the rear ones were dull and sometimes a little rusty

Took it to my friendly mechanic who says that the SiLK has a brake bias so that the rear brake effect is reduced to stop rear end braking away?

My brakes stop me fine and I have confidence in my brake system.... And my mechanic just seems odd to me

First. Thing in the morning when the beast is on choke and rearing to be away the brakes groan to stop the car as I put it in gear

I also have a c class 200 kompressor which is much gentler under choke in the morning which is a happy coincidence for wifey who is a timid driver
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#2 Old 03-22-2014
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Its been cold here recently and the car starts on choke and higher revs.

I have a gravel drive and the rear wheels driving off push the front wheels which have locked on the foot brake through the gravel

Does this seem right?
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#3 Old 03-22-2014
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afraid so I drive lots of different cars at work and all Mercedes make that groaning noise from the brakes when putting it in drive or reverse its just a characteristic of the make if its any help old jags (1970,s - 1980,s ) are worse in that when you put them in drive and there on choke you get half a revolution of rear wheel spin when you put them in drive or reverse (and they smell off wee and old people )
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#4 Old 03-25-2014
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Thanks BB- that is reassuring... must change end of drive from gravel to paviours as the beastie is eager to be away these cold mornings

Starnge that the C class is a completely different animal and much gentler (also a 200Kompressor?)
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#5 Old 03-26-2014
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Many cars seem to have brake bias set such that the rears hardly work at all.

My previous SAAB 9-3 was so bad that the rear disks had to be changed because they were badly corroded through disuse, while the fronts were perfect.

You have to occasionally brake REALLY hard to make the rears work properly. When there's no-one else around and you're travelling in a straight line, brake hard, then hammer on the brake pedal as fast as you can, to make the brake assist kick in. Do it a few times. That should do it.

A friend of mine who's a former rally driver has a knack for cleaning the rear disks. He takes the car out for 5 minutes. On his return, the rear disks are gleaming, but the front disks have melted, the tread's disappeared from all the tyres and the engine's thrown a rod
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#6 Old 03-27-2014
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AJ- sounds advice- I will try that- my maintenance bills arent high enough yet!

I was think of slipping the hand brake on now and again just to keep them gleaming- cant do that on the C class as it has one of those new fangled foot - hand brake and a knob to pull to get it off.

Strangely the C class doesnt have this problem
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#7 Old 03-27-2014
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I think you will find that does not work. I believe hand brake on SLK is a drum type in centre of the Disc rotor and has no effect on the calipers/pads
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#8 Old 03-27-2014
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Originally Posted by Ceebee2 View Post
I think you will find that does not work. I believe hand brake on SLK is a drum type in centre of the Disc rotor and has no effect on the calipers/pads
You are correct in your thinking as the hand brake is a drum brake. Look at the disc and on the outside you will see the drum brake. Very common for most all cars with rear disc brakes.


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#9 Old 03-31-2014
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Quote:
Originally Posted by Dolau View Post
AJ- sounds advice- I will try that- my maintenance bills arent high enough yet!

I was think of slipping the hand brake on now and again just to keep them gleaming- cant do that on the C class as it has one of those new fangled foot - hand brake and a knob to pull to get it off.

Strangely the C class doesnt have this problem
The C class is a lot heavier in the back end, so the brakes work harder and keep themselves clean.
That being said, my rear discs don't have any rust on them at all and a recent change of the brake pads show the same amount of wear on the rear pads as on the fronts. Perhaps you don't drive it aggressively enough
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#10 Old 04-01-2014
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Ahhhh that's where I am going wrong- not driving as aggressively as MrMercedes designed

Interesting about the hand brake though- haven't even taken a wheel off yet so hadn't thought that through
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