W109 rear caliper trouble - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 08-31-2012, 02:22 PM Thread Starter
BenzWorld Newbie
Date registered: Aug 2012
Vehicle: 1972 300 SEL
Location: Port Washington, WI
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(Thread Starter)
Post W109 rear caliper trouble

Hi everyone! New forum member here. This is my car, a 1972 300 SEL with 72k miles:

After buying my W109 last fall, one of the first areas that needed attention was the brake system. I was happy to discover that the front brakes only needed new pads (and a thorough cleaning/greasing of the hardware). The rear brakes, however, were a bit worse off. I couldn’t even pry the calipers loose with the tools I had available to me, so I took the car to a local shop to have the rear brake work completed.

One look at the rear calipers and the local mechanic assured me that they were totally shot. I ordered replacement calipers online from ATE – part nos. 1598568 and 1598638. (At this point I admit making a rookie mistake: I did not realize the original calipers could have been rebuilt, so I threw them away. Whoops!) After the new rear calipers were fitted, the rotors were de-glazed, new pads were put in place and the system was bled and declared finished.

Not long after getting the car back, the rear of the car began to shudder violently when braking. Since I had reason to doubt the first mechanic’s level of vintage Mercedes expertise, this time I took the car to a Bosch approved shop with a specialty in older German cars. Their diagnosis is that the ATE calipers do not fit correctly which is causing the top of the brake pads to make contact with the rotors at an angle.

Here’s the tricky part: neither the mechanic nor I can find any evidence of a different caliper part that is correct for the car. I’m at a loss as to what the next step should be…

1) Is there, in fact, a different set of rear calipers for this car than the ones I ordered? If so, what are the part numbers and where can I find them?
2) If these are the correct calipers, what must be done to correctly align them to the rotors?

Thanks everyone!
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post #2 of 2 (permalink) Old 09-03-2012, 08:52 AM
BenzWorld Senior Member
Date registered: May 2007
Vehicle: 64' 220SEc, 72' 300SEL 6.3, lots of parts
Location: San Diego/Spring Valley
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The W109 has those anti lift brake devices when the shims are loose will cause judder especially when backing.

Calipers should be standard units

Brian O
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