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Mercedes 300D Suggestions

2231 messages,  Last post on Nov 11, 2009 at 9:21 AM

You are in the Classic Cars Forum. Your Host is mr_shiftright

What is this discussion about? Mercedes-Benz 300-Class, Engine, Fuel System, Diesel, Coupe, Sedan


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#2143 of 2231
Re: vacuum pump [calaismarie] by burdawg
Apr 05, 2009 (5:07 pm)
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Replying to: calaismarie (Apr 05, 2009 4:44 pm)

If if the vacuum boost to the master cylinder went out, the brakes would still work. You would have to push the pedal harder, but they would still work. Are you saying that the brakes went completely out, pedal to the floor with no braking?
#2144 of 2231
Re: vacuum pump [burdawg] by Mr_Shiftright HOST
Apr 05, 2009 (8:48 pm)
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Replying to: burdawg (Apr 05, 2009 5:07 pm)

burdawg's on the scent here.
 
HARD pedal = bad vacuum booster or vacuum leaks somewhere
 
SOFT/sinking pedal to floor = master cylinder or brake caliper or brake line issue or air in the lines. (refill, bleed, inspect).
 
Step on pedal with both feet, press hard. If it keeps sinking and sinking until it hits the floor, that's a bad master cylinder for sure or a big leak somewhere or lotsa air in the lines.
 
If you press and press and the pedal hits a point and refuses to sink further to the floor, then there's nothing wrong with the hydraulics, it's in the booster.
#2145 of 2231
Re: vacuum pump [Mr_Shiftright] by calaismarie
Apr 05, 2009 (9:10 pm)
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Replying to: Mr_Shiftright (Apr 05, 2009 8:48 pm)

thanks - a friend bled the lines not long ago - i bet he just wasn't careful enough to get the air out. that makes a lot of sense.
 
another question - another thing they told me at the shop was that the ball joint had a lot of play, but the parts list they printed out showed a replacement for the control arm. i'm regretting not having the time to ask them to show me exactly what they were seeing. any idea how big of a job that's going to be? It's not show in the 123 Manual (or at least I'm not finding it yet) Especially if I'm already planning to replace the rotors up front there.
#2146 of 2231
Re: vacuum pump [calaismarie] by Mr_Shiftright HOST
Apr 06, 2009 (7:54 am)
Reply

Replying to: calaismarie (Apr 05, 2009 9:10 pm)

did they tell you the amount of play in the ball joint? More than 1/8th inch is no good but less than that is okay. This shop you go to doesn't do a lot of explaining, do they?
#2147 of 2231
Re: vacuum pump [Mr_Shiftright] by calaismarie
Apr 06, 2009 (8:05 am)
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Replying to: Mr_Shiftright (Apr 06, 2009 7:54 am)

all they said was "really really loose" which doesn't sound very good. i had planned on having them give me a lot more information, but i ended up back at the shop super late (actually they held open for 10 minutes for me to get there) because of delayed subways. i didn't feel right about staying and making them explain when i was there so late and didn't even allow them to do any work on it.
#2148 of 2231
Re: vacuum pump [calaismarie] by Mr_Shiftright HOST
Apr 06, 2009 (8:25 am)
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Replying to: calaismarie (Apr 06, 2009 8:05 am)

Okay fair enough, but "really loose" is not very precise.
 
Sometimes things are allowed to be loose---it doesn't matter so much.
 
Replacing an entire control arm---yeah, that can add up, because you'd probably need to do both sides and then it's one of those "while we're in there" kind of jobs.
 
I'd ask them to measure the play.
 
I mean, if it's ready to FALL OUT, sure---that's dangerous.
#2149 of 2231
85 300D climate control unit by seh43
Apr 06, 2009 (5:20 pm)
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I recently purchased an 85 300D project car. Most problems are relatively easy to fix, BUT, the CCU has me stumped. No matter which button I push or which dial I turn, it does absolutely nothing. there is no air entering the cab at any time or speed. I don't even know where to start. Any help would be appreciated!!!
 
thanks
#2150 of 2231
Re: 85 300D climate control unit [seh43] by burdawg
Apr 07, 2009 (5:36 am)
Reply

Replying to: seh43 (Apr 06, 2009 5:20 pm)

It's nearly impossible to say. You need a FACTORY manual, I'm not sure if the CC manual is separate in 85 like earlier or not. It could any number of problems, vacuum or electrical, in the control panel itself or somewhere else. It doesn't do anything, even when you put it to defrost? Have you checked the main fuse?
#2151 of 2231
Re: 85 300D climate control unit [burdawg] by seh43
Apr 07, 2009 (9:34 am)
Reply

Replying to: burdawg (Apr 07, 2009 5:36 am)

The fuse is ok. When I unplug the harness to the CCU it has power to terminal 7.
 
I will check the fan motor today and see if I can find a manual.
 
thanks for the info.
#2152 of 2231
Mushy brake problem solved... Finally. by jameslei
Apr 07, 2009 (10:33 am)
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Mushy brake problem on my 1982 300TD was not ameliorated by a new master cylinder, or fiddling with the vacuum system. The problem was the badly worn disks
(rotors?) inside the front wheels where the brake pads do their thing; I think they've been on the car since 1982. The bill was $950 Canadian, but now I can come to a stop without prayers!
 
Many thanks to folks who gave me advice.
James.

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