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#1
09-09-2003, 07:49 PM
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front calipiers
W126 300SD
does any one know if these are "floating calipers?" one piston moves as the inner one moves along with the caliper. i have been told both so i would like to confirm this. thanks ned
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198? 300D ???K - Future DD 1989 300TE 285K - traded in '12 1984 300SD 186K - Sold in 08 1978 300SD 330K - Died in 05 
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#2
09-09-2003, 08:56 PM
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If you have Teves(ATE) or Bendix they are fixed
If you have Gerling they are floating. That is what the 126 manual says, My 300SDL has Bendix Performance products shows, 81-86 SD or SDL. Front Bendix or ATE. Rear Bendix or Girling. Same with fastlane. Dave
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1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car Last edited by dmorrison; 09-09-2003 at 09:08 PM.
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#4
09-10-2003, 03:46 AM
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Have you seen Girling calipers on many MB's all three of mine have ATE's and I must say they are easy to work on and very trouble free if you use ATE pads.......
William Rogers......
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#5
09-10-2003, 04:19 AM
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I'm not familiar with your model, so can't comment on what is standard fitting.
A floating caliper only has one piston. When this piston pushes the brake pad against the disc, its action moves the sliding part of the caliper so that the brake pad fixed to the caliper presses against the other side of the disk. A fixed caliper has two pistons and each piston is responsible for pushing a brake pad against the disk. When a floating caliper siezes, it is usually the sliding part of the caliper that stops sliding. You then only get the pad on the piston side pressing on the disk and you get vastly reduced braking effort. If the piston has siezed, you get no braking effort at all. On a fixed caliper, if one piston siezes, you get reduced braking effort. It is very unlikely that both pistons would sieze at the same time. If neither piston moves, it is usually a problem elsewhere in the system.
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Cheers, Neil
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