Help! Hit dip and now my brakes are gone! - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 10-25-2007, 02:01 PM Thread Starter
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Exclamation Help! Hit dip and now my brakes are gone!

Ahhh, I need help!

This afternoon I was cruising in my 1980 450SL and I came up on a hidden dip in the road...the front end bottomed out pretty hard and then my brakes suddenly stopped working.

When I hit the brakes, it doesn't go all the way to the floor, and I have to press down REALLY hard to make it stop at all.

I took a look under the car and nothing is hanging or seems to be broken loose, and nothing is dripping or leaking.

Does anyone have any thoughts on what the problem may be, or what to look for to test?

Thanks!

________________________________________
Zack Fogelman
Austin, TX
1980 450sl - My "learn how to work on cars" car
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post #2 of 7 (permalink) Old 10-25-2007, 02:53 PM
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Sounds like you broke a brake line. Put is on a lift, add fluid, have someone step on the brakes, look and see where it’s spraying.
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post #3 of 7 (permalink) Old 10-27-2007, 06:39 PM
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It's also possible you did other damage...bottoming "pretty hard" covers a lot of territory, doesn't it? Bent parts could also have crushed a brake line, there's a whole host of things that could be affected as well.

For safety's sake, I'd strongly encourage you to stop driving it immediately and have it towed to a good indie (or even the stealer) for a proper inspection. Unless you're very close to one and can travel sidestreets at such a slow speed you can safely stop it with just the parking brake no matter what. While this might be your DIY car, if you're not up to a proper inspection so you know what to DIY, then you need to leave that to a professional.

Take care and enjoy the ride,
Greg

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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post #4 of 7 (permalink) Old 10-28-2007, 12:45 PM
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Hi!

It strongly sounds like you'd have a damaged powerbrake. Check the hose(s) and pipe connections around the vacuum system of the brake servo. If no other damages occured in the hidraulic system, maybe that's the problem. Don't you have a higher idle speed since the hit?

regards,
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post #5 of 7 (permalink) Old 10-28-2007, 10:04 PM
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What everyone else is saying.

If I think correctly, the W116s have ABS and those are hard brake lines that run under the car and could be damaged by something like bottoming out, depending on where they are positioned.

You could have damaged one by blocking it and preventing the flow of fluid.

Either that or your snapped the belt running your ABS pump...if there is such thing????? Or you damaged your power brakes pump....I know there's such thing as that

Quote:
Originally Posted by MarcusF View Post
Sounds like you broke a brake line. Put is on a lift, add fluid, have someone step on the brakes, look and see where it’s spraying.
If you lost fluid, I would think that you'd be able to floor the pedal and have no reaction since there's no pressure build up within the lines....no?
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post #6 of 7 (permalink) Old 10-29-2007, 12:15 AM
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Quote:
Originally Posted by chinny4290 View Post
If you lost fluid, I would think that you'd be able to floor the pedal and have no reaction since there's no pressure build up within the lines....no?
Depends. How big is the hole?
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post #7 of 7 (permalink) Old 10-30-2007, 08:54 AM Thread Starter
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(Thread Starter)
Found the problem!

Thanks everyone for your help with this, I had no idea where to even start looking, but after some of the responses I got, I was able to locate the problem!

As soon as I looked under the hood, by the Master Cylinder, I noticed that the check valve on the brake booster vacuum hose had completely broken in half. I ordered the part the other day and expect it to come in any day now. In the meantime I was able to temporarily fix it with duct tape, to ensure no vacuum loss, and now I have brakes again.

Thanks again!

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Zack Fogelman
Austin, TX
1980 450sl - My "learn how to work on cars" car
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