I have one rear caliper piston that is stuck. Seems to have been that way since I bought the car (3 years ago) and when I went in to change back pads, I saw a metal backing plate with no pad material on it. Tried to pry back the piston, but it's rusted and stuck. I figure if I do get it to move, it will only leak because of all of the corrosion that is on it.

Do I need to replace both rear calipers or can I do just one? I was thinking of replacing just the one with a rebuilt ATE if possible. I'll be putting in new pads and new rotors when I do the job.

I've heard that you always do the same work to both sides when you're doing brake and suspension work. I know this obviously applies to pads and rotors, but does MB require both new calipers if they're the same brand?

Thanks!
Neal

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'83 300SD 335,000km (207k) mi SOLD
'87 560SL 163,000km (101k mi) SOLD
'86 300SDL 356,000km (220k mi) SOLD
'92 500SEL 250,000km (155k mi) SOLD
'90 300SL 140,000km (87k mi) SOLD
'01 S430 260,000km (161k mi) SOLD
'03 SL500 167,000km (104k mi) SOLD
'07 S550 4MATIC 235,000km (146k mi) SOLD
'07 GL320 CDI 4MATIC 348,000km (215k mi)
'13 GL350 BlueTec 4MATIC 170,000km (105k mi)
'14 SL550 72,000km (43k mi)

It is best to replace both instead of one, it is a rear and it might not make as much differance as a front would , in the other hand why take a chance when it comes to safety items such as brakes?

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euro 287
Mercedes Technician 7 Years (retired to Hyundai)
2000 Dodge Durango
98 Mazda truck

Try www.********.com for rebuilt units.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe

You may be able to rebuild the caliper yourself it you want to try, but otherwise you only need to replace the one, not both.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

I agree with Peter about replacing only the frozen caliper, but I certainly would inspect the other 3 calipers to assure that they're functioning properly.

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Fred Hoelzle