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Brakes are hard to press down and does not stop truck, when releasing brake the engine idle falls and it almost dies

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The power assist unit just behind the master cylinder is not working and has a huge vacuum leak. That is causing the idle rpm to fall.

Posted on Dec 06, 2016

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You don't say how old your truck is or what type it is. But if I were to guess I would say that you have a vacuum problem. Can you hear a hissing sound under the hood? Look for cracked or holes in your hoses that go to the master brake cylinder.

Posted on Dec 06, 2016

Testimonial: "It's a1994 Dodge Dakota, we hear no hissing under hood, this started after the caliper was changed"

  • Lawrence Oravetz Dec 06, 2016

    Make sure the brake pad faces are parallel to the rotor (not worn slanted). This condition can cause the pad to bind on the caliper.

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Could be servo not working

Posted on Dec 06, 2016

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4 Answers

1984 Honda Accord Brake Problem


well aside from the boosters you may also want to check the possitioning rotor and calipers. there is a possibility that something slipped, or leaked, check for brake fluids and try to trace where it is comming from.

the picture below shows how to disassemble the brakes of an Accord, the only special tool you will need is a ball joint fork to seperate the upper and lower ball joints. You have to remove the whole steering knuckle assembly to get to the bolts in back of the rotor and hub assembly.

b8487ef.gif
hope this helps

Aug 05, 2008 | 1984 Honda Accord

1 Answer

What would cause engine yo die at a stop light and not start again. The engine almost turns over but doesnt.


engines stopping at lights can sometimes be attributed to a vacuum leak in the brake booster
test by idling the engine with the hand brake on and no foot brake then apply the foot brake and if the engine dies then it is the brake booster
hard to restart may be the vacuum leak if you still have your foot on the brake.

May 12, 2015 | Cars & Trucks

1 Answer

Why does my 2003 ford taurus idle up when i apply the brakes


There are a few obscure potential causes, but these are less likely than the most common reason: The power assist brakes are operated by a vacuum diaphragm which is provided vacuum from the engine. When the diagram inside the brake booster has a leak, when you apply the brakes it causes a vacuum leak for the engine which will raise the idle.

With the car in park, engine running, make sure that it comes and goes every time that the pedal is depressed and released. Another way to check it is to turn off the engine, wait about five seconds, then depress the brake pedal, counting how many times it can be pressed before the assist goes away (you will see a difference).

If you can press it four times or more, the leak may be elsewhere, however if it only presses once or twice (before it gets hard, and only goes halfway down), it has a leak and will need to be replaced.

Good Luck!

Apr 05, 2014 | 2003 Ford Taurus

2 Answers

Idle


MAYBE CHECK (MAF) MASS AIR FLOW SENSOR

Jun 29, 2013 | 2000 Chevrolet Tracker

1 Answer

Finding the idle goes up n down/die out when using Defrost


Sounds like a vacuum problem. Do you have a seemingly hard brake pedal? If you do chances are your brake booster is leaking vacuum. If not check your vacuum lines. Your heater system is controlled by vacuum.

Feb 22, 2013 | 2002 GMC Envoy

2 Answers

I have 1999Chevy suburban with 6.5 turbo diesel motor.it idles up and down and when driving the gas pedal is real touchy Wat is the problem and were do i locate the problem


Check the help links related to this problem.Click the link below to go through its troubleshooting procedure :-----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html---------
Car won't start without hitting the gas pedal? http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-without-hitting-gas.html
-------Complete loss of brake pedal then all gets normal? http://repairhelpcenter.blogspot.com/2012/01/complete-loss-of-brake-pedal-then-all.html
------Car dies when gas pedal is pressed? http://schematicsdiagram.blogspot.com/2011/12/car-dies-when-gas-pedal-is-pressed.html
--------Pushing on the gas pedal, but the car slows down? Gas pedal to the floor and the car slows down?

http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html

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After replacing brake rotors and pads, brake pedal remains on floor? http://technoanswers.blogspot.in/2012/02/after-replacing-brake-rotors-and-pads.html

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accelerator pedal sensor? http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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For rough idle issues and problem troubleshooting,go through the help links provided below :----- van idles rough?

http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html

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will not idle when cold?

http://technoanswers.blogspot.in/2012/02/ford-explorer-40-will-not-idle-when.html

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runs lean and idles rough?

http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html

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Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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Erratic idle on car?

http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html

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Low idle when cold out side?

http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html

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Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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Engine quits at idle?

http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html

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Car overheats and Air blows hot at idle?

http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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This will help.

Thanks.

Mar 01, 2012 | 1999 GMC Suburban

1 Answer

When push brakes you have to push really hard to make them go in then the truck barely stops. Replaced the MC and bled the brakes now every time push brakes truck acts like its going to die. Brake light...


Sounds like you will have to bleed your brakes again, but thats not the problem og hard brake peddle, need to check your power brake booster, sit right in back of master cylinder, check make sure it has vacum going to it, also to test it with engine off, press on brake peddle three time, then state engine with foot on peddle, peddle should go down a few inches, also with engine of peddle should feel soft for three pumps, if you have none of this , power brake booster is bad.

Jul 04, 2010 | 1995 Toyota 4Runner

2 Answers

Stalls out when braking quickly, worse with going down hill


Assuming that the vehicle is equipped with an automatic transmission, it looks like the torque converter lock-up system doesn't release as fast as it should, so if you brake hard, the converter is still locked up and your wheel brakes stall your engine (just like pressing ******* the brakes with the clutch pedal released on a manual transmission vehicle). Normally, when you brake hard, the lock-up should release and prevent the stall from happening. Might be a bad torque converter, or a bad lock up solenoid in the transmission... Before jumping to anything else, i'd try checking the fluid level in the transmission and an oil/filter change in the transmission. Lots of times one or the other can cure the problem.

Jan 13, 2009 | 1995 Nissan Pathfinder

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