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bob_98sr5 08-24-2008 03:04 AM

Help needed asap re dragging rear passenger brake caliper
Hi folks,

I made some time to work on the 300DT today, but it was really hot today here in LA, so we tried to work as quickly as possible.

My friend and I had a pretty productive day. We installed my old 87 300D differential into the replacement subframe w/ brand new bushings and all the links as well. To make a long story short, after bleeding the brakes, we put it in gear and drove it for a few hundred feet down the street. Only the rear brake caliper is stuck, or as some posts I've read described as "dragging."

I really don't understand why the brake is dragging at all. All we did was replaced the differential that was still attached to the replacement subframe (from a 260E) with my old 300D differential. That entailed moving the driveshaft out of the way and installing the original diff. Of course, we needed to remove the 1/2 shaft XZN bolt and then reinstall the 1/2 shafts. But again, why did only the rear passenger caliper stick?

Tomorrow, we are going to try to unstick them based on some of the links I've found on the forum. Any last minute advice is appreciated.

toomany MBZ 08-24-2008 05:36 AM

Perhaps it needs replacement.
Good luck, and let us know how it turns out.

t walgamuth 08-24-2008 07:55 AM

If you kinked the emergency brake cable perhaps it is the emergency brake dragging.

Tom W

Shorebilly 08-24-2008 12:17 PM

Try this.....
Pull your brake shoes on that wheel......rotate the disc by hand to assure that the "Parking Brake" is free......

take a large screwdriver and pry the caliper pistons back into the caliper.....this might free them up enough to drive the car......

If the pistons will not move into the caliper, try cracking the brake bleed screw.....and pry.....if the caliper piston moves and fluid squirts from the bleed have a blocked brake line......

sometimes a bit of the rubber inside the hose can form sort of a check valve....and prevent the fluid from returning to the reservoir....

Caliper overhaul kits are relatively cheap, and easy to install......


bob_98sr5 08-24-2008 12:24 PM

ok gents, all great advice, thank you. off i go in this +90F heat!

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