Hey guys, looking for some help here. I have a 1989 Mercedes 300E (W124). The car has been sitting on the side of my house for almost two years. I replaced a brake line awhile back and ran into problem after problem. Anyways... here's the dilemma. I took out the master cylinder and replaced a line that went from the master cylinder to the ABS unit. I paid a guy to torch 3 of the bleeder valves because i learned the hard way and sheered one of them off. The car is all back together and sitting on blocks. I'm having trouble bleeding the system. For one thing when I start the car the idle sky rockets and won't level down (Vacuum leak? Yeah but where and why? It didn't do it before i attempted to bleed the system). Now the main problem is I don't have any brake fluid at any of the calipers!! I pumped the brakes and even used a manual vacuum pump but still nothing. The master cylinder reservoir won't go down. So I'm convinced that there are several or a large air pocket in the ABS unit. I don't know what to do, and it's tough finding the answers online. Right now I cracked all the bleeder valves and opened the lid to the MC and doing a "Gravity bleed". Read it online..... But yet the MC level still hasn't changed. Any input would greatly be appreciated. Thanks

Can you pressure bleed it? As i am sure you know gravity sucks.

Well I tried using a manual vacuum pressure bleeder but had no luck..... I have some news; however, I went outsidew after about an hour....and started to pump the brake pedal and I can see the reservoir going down. Looked around tthe car and it was the front passenger side leaking out a lot.....the rear still have nothing....Should I just keep waiting?

Did you bleed the master cylinder by itself? You got to do that first.

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Jim

Yup... I blead the MC . That was the first thing I did....Can the ABS unit by Bosch be blead? I see a little torx screw in the back at the bottom ...Also the driver caliper is the one where I broke the bleeder valve so I'm going to bleed it through the hose....why isn't any fluid getting to the rear? Is my assumption about an air pocket in the ABS plausible?

Once the m/c is bled it should be just like any other bleed job.

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Jim

Hmm.... You know maybe I didn't bleed the MC right....what I did was I unscrewed the screw at the bottom right of the MC, stuck a nipple and clear vacuum hose to one end and the other inside the MC....Filled with fluid and pumped the pedal....I watched the air bubbles go through the hose and it was clear fluid after.....Was I suppose to plug the 2 holes where the lines come out of?