Question about 1997 Ford Contour

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Brakes seem to work when engine is not running, when engine runs, breaks do not work

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Bad master cylinder or check the vacume line going to the booster for leaks if leaking repair leak on vac then check brakes again if still bad then I bet the master cylinder is bad and this with assuming all other brake parts on your car are good operating condition .....

Posted on Nov 17, 2009


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Break pedal is extremely hard to push and i can hear a hissing noise, also my truck will not idle well in gear but when you put it in park it seems to revive its self.

Check for vacuum line leak by removing the hose from the booster and plugging off. If the engine settles down and runs ok then there is a problem in the booster controls or diaphragm. Replace the booster if that is the case. Hard brakes is the result of no vacuum assist when you put the brakes on and the noise is air escaping into the manifold through the hole and making the engine run rough.

Sep 23, 2013 | 1995 Toyota 4Runner

1 Answer


Brakes and engine are totaly diferent systems. Do you have brakes when engine is off? If so the only conection between engine and brakes could be vacume which is created by the engine stored in the chamber at the master cylinder to assist with brakes but does not overide personal brake presure only help increase braking. If trully you have less breaking preasure with the engine running then check the vacume line at the master cylinder to see if there is a vacume or maybe preasure?

Sep 18, 2012 | 1993 Plymouth Acclaim

1 Answer

My silverado is running about 1200 rpm"s, i changed the throttle body sensor, no difference, if i take out the pcv valve, it slows down, but shake it, it is good, the oil cap unscrew it it barley...

look for the idle air bypass valve it sounds like it is stuck open leaving the engine idle at too high of an rpm, that would explian the hard braking because it cant build any vacum for the brake booster to work.

Jun 12, 2011 | 1996 Chevrolet K1500

2 Answers

The ABS light came on and is staying on. Why and what do I need to do? The vehicle doesn't seem to drive any differently. I did notice a motor of some kind running after I turn the engine off. Could...

abs stands for anti breaking system its something strting to go wrong with your brakes it throws that code until you fix the problem could be serious could be low break fluid find a honest mechanic shop most of them will tell you what it means free they can pull the abs code that tells them what it is good luck

Nov 29, 2010 | 1995 Isuzu Trooper

1 Answer

Non-functioning power brakes and rough running engine

You have an air leak from the brake servo.Block the hose at the servo and see does it run better,if it does then its the servo.Also check the vaccuum hoses off the main servo hose.You have no vaccuum in your servo and thats why the brakes are solid.

Mar 03, 2010 | 2001 Volkswagen Cabrio

1 Answer

Have to press hard on breaks to break on 528i bmw 2000

sounds like brake booster not working
check vacuum hose that goes to booster is ok and not leaking
engine off
pump up brake pedal several times
hold brake pedal down
start engine
pedal should sink down approx half to 3/4 way down indicating booster is working
if pedal doesnt go down when engine is running booster has leak or no vacuum supply from engine which requires great pedal effort to try and get vehicle to stop.

Jun 26, 2009 | 2000 BMW 5 Series

1 Answer

Brake pedal goes to floor when engine is running

You need to see if you have fluid in the master cylinder's resivoir.. low fluid or no fluid could be a low break pads or out of adjustment problem ....if fluid is low add dot3 break fluid..and step on the pedal a few times...if the level seems to hold it could be out of adjustment or low pads . If the fluid leaks out then you have a leak and must attempt to find it yourself or with a mechanic. It is possible you may have air traped in the system and it may need to be bled out by a mechanic. I say a mechanic because this is a crittical safety system needed to stop the car !! If you are not sure of how to repair a leaking brake line or caliper or master cylinder leave it to a pro . At least you may be able to find out what is leaking with this help .

Apr 04, 2009 | 1994 Toyota Camry

1 Answer

No nighttime running lights 2001 Toy Solara

Hiyah lsutigersare!

This may seem like a stupid solution, but check to see if your parking break is on. It may not be on enough for you to notice while driving.

Having the parking break on even a 1/4 inch will turn off your running lights.

Hope I've helped, don't forget to rate.


Feb 24, 2009 | Toyota Solara Cars & Trucks

1 Answer

Keep getting air in break lines

1. bleed your vehicle while the engine is running. 2. Check ALL your brake lines, connections and wheel brakes cylinders or calipers of any leaks or moisture. 3. If nothing happens, your brake masters or your caliper's pistons may be weak and needs replacement.
post me of any development

Dec 09, 2008 | 1987 Mercedes-Benz Mercedes Benz 500 Class

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