First time post. If this topic exists somewhere else please help me out with where to go.

Just bought a 2000 E320 with 220k miles for my son who just turned 18. Car looks good on the inside but was driven up in New Jersey in an earlier life and is baked in rust underneath. Got it for $1700... probably paid to much, but he and I can work on it together.

The brakes felt squishy and we found the right front brake hose cracked. Got the part and installed the hose. As we were bleeding the brakes with a power bleeder we noticed the left front had sprung a leak. After a thorough inspection and to our consternation we found a tiny pin hole in one of the very thin black hoses that go behind the suspension to be the cause of the leak. When we press on the brakes with the car running it produces a fine mist of brake fluid.

Tracing the thin hose looks like it runs into the ABS via a wheel well connection where it meets up with another thin black hose down to the caliper.

In all the you tube videos I've found on the brake system there is no mention of these lines or how to change them out.

Appreciate the help in advance with any part info/ videos on how to get this fixed.

 

See attachments, BTW model is 210 should be posting here: https://mbworld.org/forums/e-class-w210-2/

 

thanks for the diagrams. However it looks like the hose that is leaking isn't part of the diagram. It's a thin black tube that's maybe 2mm outside diameter. It gets routed behind the shock (where the leak is) and then around and to the brakes on one end and then up and to the wheel well (near the engine when it connects into another line that goes down into the wheel (i think this is the ABS wheel speed sensor line). ON the engine side where the connectors come out of the wall the lines trace back into the ABS.

I've bled all the brakes with a power bleeder at 1 ATM... while doing the bleed under pressure is when i noticed the leak. It was dripping pretty rapidly from the wheel well behind the shock. After the completion of the bleed, I tested the brakes with the car running and pressed on the brakes. I could hear air/ fluid moving from the ABS and then a mist of brake fluid shot out from behind the shock area along this thin black tube. I think i can feel a pin hole leak where air is coming out.

I'm thinking the next step is to splice this tube with an oversized piece of tubing and retest the system. Anyone have any other thoughts?

 

Without a picture, I think you're seeing 3/16 steel brake line. By your description, it sure seems like #120 in the second file (A 123 420 65 28) Looks like it does not come pre-bent, so probably easier to check the flares, fittings, and length of your line and get a replacement at almost any parts store

 

No it's flexible black thin 2 to 3 mm hose (rubber or plastic) for sure. I'll get some pictures up when I'm back home on Thursday. Thanks for the reply!

 

See attachment.

 

found the leak... not black hose. Hard brake line...ughh got the rusted out one out now to order the new line and install.

Anyone recommend going with mb part or flexible copp
tubing sold on Amazon and bending myself with a flare kit (never done this before)?