Having problems with my 1983 300sd brake system - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 04-11-2004, 04:23 PM Thread Starter
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Having problems with my 1983 300sd brake system

Hi,
I am having problems with the brake system on my 1983 300SD Turbo. I replaced the master cylinder, and the front left caliper. I bench bled the master cylinder and reconnected all 3 brake lines. Then, with the help of a friend, I bled the rear brakes and got fluid through the bleed valves and no air. I then tried to bleed the front brakes and got nothing. I didn't even get air after the brakes were pumped. I disconnected the brake line on the side that the caliper was replaced
and checked the output port with a vaccuum pump tool and I didn't get any fluid out of the port. Yet when I used the vaccuum pump during the bench test, I got fluid through the port.
HELP
Jerry Golem
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post #2 of 5 (permalink) Old 04-11-2004, 05:12 PM
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RE: Having problems with my 1983 300sd brake system

The only thing I can think of is to make sure there’s no leak around the bleed tube and bleed port.

If you have not already, post this in the w126 forum (that’s the chassis type for your car).

Someone may have experienced the problem there.
[?]
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post #3 of 5 (permalink) Old 04-12-2004, 07:52 AM
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RE: Having problems with my 1983 300sd brake system

There are two chambers in the reservoir container. It takes awhile sometimes for the rear container to fill up. The rear container feeds the front brakes. Take your shop light and shine it on the reservoir and see if the fluid made it to the rear chamber. You have to fill the front chamber pretty full in order for the fluid to overflow into the rear chamber.
And then you have to keep it full to completely fill the rear chamber.

Len
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post #4 of 5 (permalink) Old 04-12-2004, 01:45 PM
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RE: Having problems with my 1983 300sd brake system

you might have to replace the brake lines going to the calipers , when they get old they implode and corrode on the inside of the line preventing full flow of brake fluid to the caliper. good luck.
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post #5 of 5 (permalink) Old 04-12-2004, 08:22 PM Thread Starter
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RE: Having problems with my 1983 300sd brake system

Thanks everyone!!! It turns out that the reservoir wasn't filled properly. I didn't have both chambers leveled. Had to tilt back and forth to get both chambers level then I re-bled the master cylinder. A friend of mine got the plans to build a pressure tank to assist in the bleeding of the brakes at the wheels. What a nice device!! No more pumping and you can bleed the brakes yourself. Just connect to the reservoir cap and put 20 psi into the system and voila` you can bleed the brakes at each wheel. I purchase a hand vacuum bleeding device which was a mistake, pressure works much better.
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