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'78 240D Brake Booster Test/Question
Hi Folks,
I've got a really hard brake pedal on the 240D lately, and am trying to do some tests to verify it's the booster or not. One test I did was to disconnect the vacuum like to the booster, then draw a vacuum directly on the booster with my vacuum pump. I can get it to pump up and hold 15hg (before my hand gets tired), but when I put the slightest pressure on the pedal (like 1/4"), all the vacuum drains out very quickly. Sometimes it takes a while for the engine to shutdown, but I think I found a correlation between that issue and touching the brake pedal. I recently replaced the MC and put the new gasket in...that was working great for about a month. The booster had a lot of fluid in it at the time I replaced the MC, and I sucked as much out of there as I could. Sounds to me like the booster is done, but wanted an opinion from you guys before I bit that bullet. If I do bite that bullet, any thoughts on reman vs. new? Seems like reman would be fine. Thanks! JC
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Jonathan 1978 240d Automatic 1977 F-250 1966 VW Bus 1963 Thunderbird 1979 Audi 5000 1970 VW Bus |
#2
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It sounds to me like its done too. You had a master that leaked fluid in it, and that fluid did in the booster. Pretty much what you suspect.
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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12 1982 380SL 1978 450 SEL 6.9 euro restoration at 63% and climbing 1987 300 D 2005 CDI European Delivery 2006 CDI Handed down to daughter 2007 GL CDI. Wifes |
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Awesome. Thanks for the confirmation.
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I just did the exact same thing on my '78 240d. Replaced both the MC and booster. I used a reman. Shoot, the MB part was over $600, which is almost half what I paid for the car.
BTW, if you post questions like this over on the diesel forum you'll get a lot more response.
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-Scott J 1978 240D |
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