Graham,re: " Do you have a model number and link? I have seen aftermarket heat shields that the racing guys use. Usually low conductivity titanium or S/S and about $100-$180 a set on top of racing pad cost. On a 300D"

Consider that the pads may have been upgraded over the years. Also materials. My hypothesis is that MBZ labeled the original round metal shields as 'heat shields' exclusively although they probably had dual purposes.. i.e. vibration control. If they labeled them vibration/squeal control and folks' brakes squealed, then there would be complaints etc. As labeled heat shields, who can prove any outcomes?

Anyway, my 300D is non-turbo and does great with naturally controlling speed once the acceleration pedal is let off. I hardly use brakes in City driving. Heavy highway driving at excessive speeds might produce alot of heat with a heavy foot on brakes...
Point is that my anecdote is a general information one and not an absolute rule setter. ergo "your mileage may vary".

Pagid T4113NAU WVA 20341


The back of the pads are coated with some rubber type coating (no need for brake pad paste) and the metal shields are also seemingly coated if memory serves me right...the pads are not tapered on the sides as the similar Pagid T4113 are. see this ebay listing as reference..

Mercedes Front Pagid Brake Pads New 014209920 | eBay

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PAGID T4113-NAU
Cross Interchange Parts
Factory Number
PAGID T4113NAU
MERCED... 0004205920
MERCED... 0004206020
MERCED... 0004209420
MERCED... 0004209520
MERCED... 0014200520
MERCED... 0014207520
View all replacement parts for free >>
Application & Descripition

MERCEDES-BENZ

Descripition:

Thickness [mm]: 17,5

Width [mm]: 89,8

Height [mm]: 73,8

Wear Warning Contact:

Brake System: Teves

WVA Number: 20341

__________________
1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
********************
1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD