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#1
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My car is w123 300D,
hydraulic brake is working properly when I depress it as normal or suddenly.Yesterday,I would like to check its system, so I drove it with low speed and I depress it a little but several time before sharp depress. The result was : It 's very hard (strength)to depress it and the car was not stop. It ran for a long distance. Itseem to be the brake was not applied. Is it abnormal ? How to solve this problem ? |
#2
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my 2 cents..... might be your master cylinder.
A bad diaphram? Did somebody bleed the brakes at some point and step on the pedal all the way to the floor as they pumped air out? This can mess up the master cylinder. Good luck.
__________________
1979 300D 220 K miles 1995 C280 109 K miles 1992 Cadillac Eldorado Touring Coupe 57K miles SOLD ******************** 1979 240D 140Kmiles (bought for parents) *SOLD. SAN FRANCISCO/(*San Diego) 1989 300SE 148 K miles *SOLD |
#3
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This type of symptom is typical of MB diesels with some vacuum problems. Each time you depress the brake pedal you use some of the vacuum the pump has produced. If there are other consumers of Vacuum (leaks in ACC,or door locks) or the pump is beginning to fail. You will get a hard pedal. The brakes will still work fine but you have no power assist. If you push down on the pedal and hold it and after a few seconds it gets hard or pushes back your booster is probably on the way out.
Bob D. |
#4
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Yes, this is most definitely a vacuum problem. You could have anything from a leaky reservoir to a serious leak somewhere in the accessories.
The best way to begin isolating the problem would be to disconnect and plug everything except the brake booster and see if the problem remains. If it works normally during this temporary arrangement, you need to look for a leak in the accessories, if not you need to check the pump and associated plumbing. Good luck, |
#5
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Last night I checked the vacuum system and found that
1.The vacuum central lock system was replace with electrical system by the former onwer. 2.The vacuum line between vac. pump and booster has 3 way connection and contected with small vac.line to start switch.(If i am incorrect) 3.The vac. line from the end of injection fuel pump is connected to start switch (same switch in item 2 but another port) 4. Other vac. line are disconcected from the system and remain open. I would like to know the operation of this system,Why it has vac. line from injection pump to start switch and tab from vac.main line with small one to start swich also. I do not know this is normal or has been modified by former onwer. Can i plug the small line that connected from main line to start switch? I do not want to use vac. central lock anymore |
#6
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That vacuum line running to the ignition switch needs to be there. That is what "turns" the vacuum on/off to the shut off valve, allowing you to start/stop the engine.
__________________
Mike Tangas '73 280SEL 4.5 (9/72)- RIP Only 8,173 units built from 5/71 thru 11/72 '02 CLK320 Cabriolet - wifey's mid-life crisis 2012 VW Jetta Sportwagon TDI...at least its a diesel Non illegitemae carborundum. |
#7
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What is the purpose of another main line from vac. pump
to air filter cover? |
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