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#1
12-23-2007, 10:36 AM
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How do I know that I need rotors replacement
My 300 SEL 1988
When I am reversing from the driving way there is this knocking sound on the rear right wheel When taking off (forward) this knocking sound increases when the wheel turn faster. It's loud as if I am using a hammer. When applying brakes it's like its grinding (metal to metal) At times this sound is not there at all. I checked the break pads and they are in good shape. Could this be the rotors. I tried following the discussion on the rotors but it's not that clear. |
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#2
12-23-2007, 11:03 AM
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On the outside edge of the rotor, if it is worn there will be a substantial lip. This lip could make contact with the metal base of the pad and grind even if you have good pad material left. If that is the case you probably are overdue for a new rotor.
Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis. |
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#3
12-23-2007, 11:07 AM
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I'm thinking maybe a wheels bearing? Check the lugnuts first and pull the wheel to check the braking components...
-GH
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For Now: 1992 Mercedes Benz 500SL 1998 BMW 528i 2003 Honda Element 2002 CBR600F4i 1977 Coachmen Motor Home |
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#4
12-23-2007, 08:44 PM
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There is a minimum spec for the rotors. Should be stamped right on the rotor. Find out what it is for your car and measure it to see if you are below the minimum.
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Len '59 220S Cabriolet-SOLD and living happily in Malta '83 240D 351,500 miles original owner-SOLD '88 560SL 41,000 miles - totaled and parted out https://sites.google.com/site/mercedesstuff/home '99 E300 turbo 227,500 miles '03 SLK320 40,000 miles - gave to my daughter '14 Smart electric coupe 28,500 miles '14 Smart electric cabriolet 28,500 miles '15 Smart electric coupe 28,000 miles 
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#5
12-23-2007, 10:01 PM
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Agree:
Quote:
Support the trailing arm. Rock the tire top/bottom = any motion = bad bearing. |
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#6
12-24-2007, 12:27 PM
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I'm not sure which rear wheel your emergency brake cable is attached to, but I had the same symptom on my W124 when the e-brake spring near the hub broke, resulting in the loud banging you describe.
One way to test is to drive the car and depress the the e-brake lever slightly to see if anything changes or the noise disappears...
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2009 ML350 (106K) - Family vehicle 2001 CLK430 Cabriolet (80K) - Wife's car 2005 BMW 645CI (138K) - My daily driver 2016 Mustang (32K) - Daughter's car |
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