Question about 2001 Chrysler Concorde

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Why does it have trouble stopping?

Brake problem. New pads, hard brake pedal- barely stops car. Slight hissing noise under dash.

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  • Chrysler Master
  • 3,679 Answers

It sounds like the brake servo isn't working but you should still have some better brakes than you dascribe so i would also check the master cylinder , whick is connected directly to the servo , quick check ,engine running remove, brake fluid resovoir cap, pump brake pedal and get some to look into the fluid resovoir and tell you is there are air bubbles or not , if bubbles most likely a seal has blown if no bubble then most likely a mechanical part of the brake system ie master push rod at fault , either way i'd get a mechanic to check as you dont take chance's with brakes

Posted on May 02, 2015

  • steve May 03, 2015

    Also check the brake caliper and piston are running free and not seized as this will account for a hard pedal a little braking force

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Posted on Jan 02, 2017

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1 Answer

My brake pedal will not budge, and a hissing noise present when running


The stop lights won't go out until the pedal is depressed, as there is a switch which is activated by the pedal.

A hard brake pedal is probably caused by a defective servo. The hissing noise is probably an air leak in the servo.

Switch the engine on, open the bonnet (the hood..) and see if you can locate the hissing - that'll probably be in the brake servo area.

If you don't know what a brake servo looks like here is a generic image:



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You have a iar leak on the vacumn pipe which is most likely or the diaphragm inside the servo has split so ask a local mechanic for a opinion

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Sounds like a possible air pocket in the braking system. Do you know how the bleed the brakes? They may need to be bled. Also, if you've added brake fluid recently, and didn't put the cap back on, it could create a suction. Another note is to check the cap to the brake fluid reservoir. It's rare, but, it could be bad.

Jul 10, 2013 | Cars & Trucks

1 Answer

Brake Problem


yes but up to a point
the brake pedal should move about 1" to take up the pedal free play and then be applied smoothly as you press further
the harder you press the more solid stopping action you will get
that way you can feel the brakes working so that you can adjust the braking action for stopping
there should be no hissing noise that occurs when the brakes are being applied
you say hydro booster which is hydraulic booster but a hissing noise will come from an air leak in a vacuum brake booster which indicates that it needs repalcing

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1 Answer

I hear a hissing noise from behind the dashboard of my 93 supercab 150. It stops a second or so after turning off the engine. I have no accessories turned on.


Sounds like a vacuum leak coming from either the HVAC controls or the brake booster. Does the noise get louder or change pitch when you depress the brake pedal? If so then you need a new power brake booster. If not then check for cracked or broken vacuum lines under the dash.

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There are 2 things that can use vacuum near the brake pedal. If you have cruise control, there is a safety switch on the pedal to shut off the curise when you apply the brake. This switch may be leaking.
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If you have a vehicle with brake shoes instead, you need to replace and calibrate brake shoes .

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