W124 300D Rear Brake Drag - PeachParts Mercedes-Benz Forum

Oldwolf · #1 09-10-2009, 11:20 AM

I’ve noticed lately that my left rear brake pads/caliper drag once when cold. I can back out of the driveway and when I go forward there is a drag and release sensation on the wheels first rotation. From that point on that brake works fine.

I don’t know when the fluid was last flushed. It doesn’t look too bad right now, but I still have that task on my checklist to do to this car which I’ve had for 4 months now.

I am planning to take the rear pads out this weekend and clean the calipers. Are there caliper slide pins on these cars that need grease like on US built cars? I’m not talking about the retaining pins that hold the pads in. What else should I clean and grease to help with this problem?

I’ll check the brake hose for swelling but I don’t recall seeing anything wrong last time I looked at it.

I think this car has the fixed rear caliper and I have already downloaded “42-0160 Checking and replacing brake pads” off the net. Ps2cho.net is such a great resource.

If you have any comments on my situation I’d like to hear them.

Thanks! - Brad

chasinthesun · #2 09-10-2009, 11:32 AM

Buy a set of brake hoses for the rear.My 1st guess is that if you have old ones that are collapsing .If you have a hand pump vac setup you can check to see if its flowing properly thru the hoses.They setup usually comes with clear hoses so you can see if you are getting bubbles thru the lines ,thus no bubbles no air.Brake open the bleeder screw while the hose is on the screw, (i believe its a 9mm open end wrench youll need) and pump the hand pump to see if you have any flow ,if its slow and air is present you have a leak in the line ,the cylinder is freezing up or a collapsing hose.Hoses if old would be my first buy. Good luck.

Oldwolf · #3 09-10-2009, 11:52 AM

I don't understand how pressurized hoses can collapse. Can you explain that to me please? Thanks.

babymog · #4 09-10-2009, 12:01 PM

The rubber swells inward.

Consider the parking brake also.

Oldwolf · #5 09-10-2009, 12:06 PM

Swelling closed, now I get it.

I don't use the parking brake while the car is parked in my garage. So I don't think it is the culprit.

Thanks for the ideas.