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Old 10-02-2013, 07:30 PM   #1
03SVT_PWRWRKS
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Question Brakes Get Hard while driving. Help?

I drive a 2003 SVT. The brakes work fine, but lets say I am coming to a stop and I repeatedly press and release the brakes, the pedal will get hard; Just as if you do it with the car turned off.

If I am rolling and I do one hard brake press, the car will stop as it should. It only happens If I am on and off the brakes.

Is there a small amount of air in the system? It cant be brake fade, could it?

Hoping it's not the brake booster going. Could it be a VAC leak? No codes.

Tried to search and find answers, but no similar problems.

Thanks for the help!


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Old 10-02-2013, 09:02 PM   #2
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You should be grateful that they get hard LOL

But it does sound like a booster issue.

Spay some carb cleaner around the vacuum lines(all of them). It the idle jumps up, there is the leak or two or six..........
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Old 10-04-2013, 06:09 AM   #3
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First question would be why do you stop like that?

Second would be do you know the condition of the one way check valve in booster vacuum supply line, it is supposed to stop that.

If you are one of those ricky-racers who comes up to a stop with one foot feathered on power slightly then that alone will do it, you are stopping motor from going to decel which makes the big vacuum that boosts the brake.

Every one of these (at least the early) cars I've seen has a problem with brake vacuum as the motor gets older, it falls off as the motor gets older and looser and results in a car that seems to brake fine until you call for a super panic stop like NOW, the car then freaks you out by refusing to stop for spit. Some of the problem is from glazed discs but changing does not fix it 100%.
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Old 10-07-2013, 10:53 AM   #4
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Quote:
Originally Posted by amc49 View Post
First question would be why do you stop like that?

Second would be do you know the condition of the one way check valve in booster vacuum supply line, it is supposed to stop that.

If you are one of those ricky-racers who comes up to a stop with one foot feathered on power slightly then that alone will do it, you are stopping motor from going to decel which makes the big vacuum that boosts the brake.

Every one of these (at least the early) cars I've seen has a problem with brake vacuum as the motor gets older, it falls off as the motor gets older and looser and results in a car that seems to brake fine until you call for a super panic stop like NOW, the car then freaks you out by refusing to stop for spit. Some of the problem is from glazed discs but changing does not fix it 100%.
I don't stop like that, I just happened to notice how non-normal it felt. And then started to relate those symptoms to what I feel during AutoX.

No I do not keep my foot on the gas while braking.

Based on the other replies I was getting, I believe it is common symptoms with these cars and also because I have a supercharger. I'm going to change the PCV valve out to see if that will help the engine get back to VAC quicker.
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Old 10-07-2013, 06:27 PM   #5
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The supercharger I'm sure would have effect there.
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