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Old 05-13-2010, 12:12 AM
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Join Date: Oct 2006
Location: Maui, HI
Posts: 111
300D brakes intermittent...

Ok, so I've read a bunch on here about brakes right now but I can't seem to figure out what my exact problem would be. So a month or two ago, I would once in a while get a brake pedal that goes all the way down to the floor. I didn't lose the ability to brake by any means, I just had to push way lower. I looked this up and it seems this would be the master cylinder failing intermittently. Then, the problem went away. The brakes where fine for these last couple months. Anyways, yesterday, I was driving on a windy road with lots of inclines and declines. At some point 15 miles in, I had to push way far down to brake, just like before, but after another couple minutes, it just became super hard to actually stop the car. I'd be pushing so hard and although the car would eventually come to a stop, it was hard and had there been more cars on the road, dangerous.

Anyways, I stopped the car on the side of the road and it didn't turn off right away, indicating a vacuum leak. Which seemed crazy to me since I recently did redid a lot of vacuum lines including the brake booster line. After reading on here it seems that I might not have a leak, but the car didn't turn off because I probably pumped the brakes, therefore using all the vacuum up.

So... continued driving a couple more minutes. Problem went away. Totally brake pedal was even firm.

Fast forward a couple days of no driving and the same thing happens again on the same road going back home. After 15 miles again. This time I pulled over, braked as hard as I could to stop the car, it smelled pretty bad, turned off the car (turned off right away this time), left it sitting for 5 minutes and started driving again. Brakes were totally normal the rest of the drive home. Firm even.

So.... I just don't understand what my problem is. Vacuum? Master cylinder? Lines? Booster?

Seems like it's not vacuum since the car almost always shuts off right away. Master cylinder seems shot for sure. Wouldn't the problem have to affect all the brakes, so therefore brake lines would mean it's all 4 brake lines? Which would be unlikely, right? Booster? That would mean the brakes are difficult to push, but not falling down to the floor, right?

Thanks,
David
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1985 300D. 179,000 miles.
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