E220 Vented Discs

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RidleyRumpus

Member
Joined
Nov 8, 2019
Messages
51
Location
Essex
Car
E280
I have just been to see a S212 that's for sale and I was looking at the Vented discs.

I've not seen Vented discs before on these cars, should the surface be flat and smooth?

On these they almost had a ripple across the surface, it didn't look or feel like what you get from grinding you get when the pad runs out, this looked almost a uniform "ripple"

Is this normal and a way to increase surface are or do these discs need replacing?
 
In My honest opinion 'cross drilled' (not vented) brake discs on humble road cars is a fashion statement and will do very little to improve braking performance but do quite a lot of damage to the lifespan of the pads and discs themselves.

If the discs have any raised edges on it's swept surface (ripple) then they are worn , not necessarily worn out , but worn . If you can see ripples in the disc surface through the spokes of the alloy wheels that correspond with the drilled holes I guarantee you the side of the disc you can not see will be in worse condition.
 
In My honest opinion 'cross drilled' (not vented) brake discs on humble road cars is a fashion statement and will do very little to improve braking performance but do quite a lot of damage to the lifespan of the pads and discs themselves.

If the discs have any raised edges on it's swept surface (ripple) then they are worn , not necessarily worn out , but worn . If you can see ripples in the disc surface through the spokes of the alloy wheels that correspond with the drilled holes I guarantee you the side of the disc you can not see will be in worse condition.

So they need replacing then?
 
If you have not bought the car yet the obvious surface wear on the discs might be a bargaining chip to bring the price down a bit to the tune of whatever MB charge for replacement . But it's not a deal breaker.

But the brakes are probably OK unless grinding and/or showing a wear lip . Not too costly to replace DIY.
 

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