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Old 11-13-2001, 10:24 PM
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Join Date: Mar 2000
Posts: 517
500 SL (R129) Brake Question

I have driven approx. a half dozen '91 -'92 500 SLs over the past several years and have found that all have what I would characterize as an exceedingly soft brake pedal feel, atypical for a Mercedes... brake action doesn't really become noticable until the pedal is depressed more than half of its travel. Its disconcerting at first but one grows accustomed to it after driving the vehicle a bit. Typically, the owners have no complaints.

Quick visual inspection invariably reveals no gross faults - pads and discs are within in maintenance limits, proper fluid quantity in brake fluid reservoir. No brake pedal sink is observed when a constant pressure is applied.

Is this typical for early R129s? Design fault(s)? Any fixes available, such as installing components from a later production year - master cylinder change? Brake booster?
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Old 11-14-2001, 08:21 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
I have driven a few and don't see this. I think these 129's will stop on a dime.
Donnie Drummonds
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Old 11-15-2001, 12:39 PM
elau's Avatar
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Join Date: Nov 1999
Location: MD.
Posts: 1,725
I always question that too. My R129 brakes definitely feel soft but it stops on a dime every time like Benzmac said. When I talked with the service advisor at the dealer, he commended me to have the brake worked on. But I found it astonishing that my brake can wear out that fast. Consider I do not drive the car that much -- less than 2,000 miles a year. I guess it is the design of the vehicle itself. Brakes on my W124, and W163 all act differently than one another, it seems each design has its own characteristic.

87 W124
95 R129
98 W163
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