What are the negative effects of a power brake? - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 04-03-2006, 07:22 PM Thread Starter
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What are the negative effects of a power brake?

I was in a discussion with some morons and was wondering what are your takes on this issue. What are and can be the negative side effects of a power brake?
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post #2 of 8 (permalink) Old 04-03-2006, 07:55 PM
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RE: What are the negative effects of a power brake?

Failure of the power booster would be the biggest concern I can think of. You lose the power assist, which leaves the brakes much harder to apply than they would be if they weren't power brakes in the first place (yeah, I'm old enough to remember driving cars that didn't have power brakes). And depending upon the type of failure, you could create a nasty vacuum leak that results in serious and potentially dangerous driveability issues. Related to that is when the seals in the master cylinder start to wear and seep, the vacuum from the power boost will suck that into the engine, not that bad, but it greatly increases the rate at which you run out of brake fluid (and ultimately, brakes).

From a driving enthusiast's standpoint, power brakes (like power steering) remove some of the ability to sense exactly what the contact patches are doing, and thus negatively affect the ability of a capable driver to more closely modulate the brake pressure. (ABS and traction control take up most of the slack for the more casual driver, though.)

All of that said, I still prefer power brakes for regular old street cars. Technology and engineering has made them much more reliable and let's face it, it's easier to press that pedal. [:)][;)]
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post #3 of 8 (permalink) Old 04-03-2006, 07:58 PM
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RE: What are the negative effects of a power brake?

You talking about when you hold the brake and put gas on with an auto transmission... Well its not good since the fluid heats up quick and puts a ton stress on the transmission. If you are going to power brake dont sit there power braking only power brake for a short amount of time like less than 10 seconds and you should be safe. And i wouldnt get your revs above 2,000 rpm and i wouldnt repeat it a bunch of times in a row.
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post #4 of 8 (permalink) Old 04-04-2006, 10:50 AM
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RE: What are the negative effects of a power brake?

funny to see this question, not a power brake, but close

I had a freind in high school that decided to show off one day in his mom's benz. I don't remember which model it was but it was old in 95ish, so, i'll say it was a 80ish 300??

So, car in neutral full throttle WAAAAAAAH, boom!
into drive, car hops about 3 feet, and the tranny is holding the back wheels off the ground.

needless to say, i didnt see ryan for a while.
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post #5 of 8 (permalink) Old 04-04-2006, 11:54 AM
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RE: What are the negative effects of a power brake?



Whenever I was taking my Porsche for new boots,I would make sure on the way to the shop that I would smoke the old ones down to the beading.It kept the guys doing the changing amused anyway.I have some photos of one of the smokescreens somewhere.[:p]
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post #6 of 8 (permalink) Old 04-04-2006, 12:26 PM Thread Starter
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RE: What are the negative effects of a power brake?

Good stuff fellas, thanks for all the input. Did not know the stuff about tranni and master cylinder thanks again.
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post #7 of 8 (permalink) Old 04-04-2006, 02:25 PM
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RE: What are the negative effects of a power brake?

A normal power brake usually just eats up your rear pads faster. U joints, tranny, diff, are all also capable of failing under the higher than anticipated torque and stress but usually do not fail unless weak or old. So 90% of the time nothing except brake wear and tear happens. You may also get driveline slack as well far prior to an outright failure of some component.
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post #8 of 8 (permalink) Old 04-04-2006, 03:13 PM
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RE: What are the negative effects of a power brake?

Deathrattle...

I always do the same thing on my bikes, when I buy new rears. The svc guys always treat you different when they just watched you light up a tire and let it burn for a minute or two!!
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