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Bill Henson
Bill Henson Posted on Jan 07, 2014
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Hard bake pedal

Hard brake pedal when applied hard. Soft application is normal

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William R Wentzel Jr

William R Wentzel Jr

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  • Expert 137 Answers
  • Posted on Jan 08, 2014
William R Wentzel Jr
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Joined: Jan 07, 2014
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That is a Vacuum Problem, You need to Check the vacuum lines @ the Brake Booster, while car is running Listen for Air leak While someone Presses On Brake peddle, Either the Booster is leaking Or 1 of the lines

5 Related Answers

Anonymous

  • 182 Answers
  • Posted on Aug 24, 2008

SOURCE: 96 F350 Hard Brake Pedal

My '96 f350 7.3 did the same thing. It was working fine I drove to the store then came out and the brake was hard. Then it was fine then hard again......turned out to be my vacuum pump. $100 fix now it brakes fine.
Hope this helps!

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Anonymous

  • 366 Answers
  • Posted on Nov 07, 2009

SOURCE: can vacumn pump make brake warning lite come on it

yes, if the vacuum assist goes bad, the brake warning light should come on.

Anonymous

  • 56 Answers
  • Posted on Oct 24, 2010

SOURCE: 89 ford e350. Brake

If the truck has RABS, the ABS system needs to be bled.

Anonymous

  • 318 Answers
  • Posted on Feb 06, 2011

SOURCE: brake pedal soft when truck

Sounds like your brake system has air in the lines. You will need to bleed your brakes starting with the longest line from your master cylinder. be sure your master cylinder is full and open the bleeder valve on the furthest line and have someone slowly push on the brake pedal till it is to the floor then close the bleeder and have the pedal returned to the rest position. Continue until no air comes from the bleeder. Move on to the next longest line and repeat until all lines are clear of air. Be sure to not run master cylinder low of fluid or you will have to start over. Let me know if this helps. Thanks.

Anonymous

  • 1 Answer
  • Posted on Dec 11, 2011

SOURCE: 95 f350 hard brake pedal

did you get your brakes fixed? If so what was wrong?

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Changed brakes and rotors on 2005GMC Envoy,now brake pedal is hard when not running and soft when running?
This is the usual behavior. When the engine is running, it is generating a vacuum, which pulls on a diaphragm in the brake booster. This is what is called "power brakes". It uses engine vacuum to help push hydraulic fluid thus reducing the amount of pressure you must apply to the brake pedal. When the engine is off your foot has to make up for the force that engine vacuum usually applies, which makes the pedal feel much more firm.
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Feb 14, 2017 • 2005 GMC Envoy
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Why is it so hard to apply brake pedal?
_______power brake booster, check vacuum to booster and the check valve for brake booster. primary symtom is high hard pedal that requires greater then normal pedal pressure to stop car. testing booster= pump brakes several times with engine off to deplete stored vacuum. turn on engine with pushing slightly on brake pedal. you should be able to feel the pedal fade away a bit, and then become firm. But not hard. if you feel nothing at the pedal when engine starts. Brake booster is not working. Good-day! make sure vacuum is going to booster with engine running. it may just be a bad vacuum line or check valve.
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Apr 30, 2014 • 1984 Buick Skyhawk
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Hard brakes
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Jan 07, 2014 • 1992 Ford Thunderbird
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Vw golf 2000 the brake pedal is to soft when you apply it and seems like is not going to stop but it does, what is the problem?
Not sure if you have done all this.



BRAKE BOOSTER INSPECTION

Functional test:
1. With the engine stopped, Depress the brake pedal several times, then depress the pedal hard and hold that pressure for 15 seconds. If the pedal sinks, the master cylinder, brake line or a brake caliper is faulty
2. Start the engine with the pedal depressed. If the pedal sinks slightly, the vacuum booster is working. If the pedal height does not vary, the booster or the check valve is faulty

Leak Test:
1. Depress the brake pedal with the engine running then stop the engine. If the pedal height does not vary while depressed for 30 seconds, the vacuum booster is OK. If the pedal rises, the booster is faulty
2. With the engine stopped, depress the brake pedal several times using normal pressure. When the pedal is first depressed, it should be low. On consecutive applications, the pedal height should gradually rise. If the pedal position does not vary, check the booster check valve.

Check valve test:
1. Disconnect the brake booster vacuum hose at the booster.
2. Start the engine and let it idle. There should be a vacuum available. If no vacuum is available, the check valve is not working correctly. Replace the check valve and retest.

END TEST
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Nov 06, 2012 • Volkswagen Cars & Trucks
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Brake pedal hard 1988 300c mercedes
If it is hard upon starting that is normal, if varies from hard to soft and vice versa when driving it could be air in brake system (faulty cilinder or gasket)
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May 17, 2012 • 1988 Mercedes-Benz 300
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Brake pedal soft after changing pads and bleeding brakes
You will need to bleed the brake system. I would start with the rear brakes lines and work towards the front.You must have key off engine off when bleeding brakes, apply pressure on brake pedal 10 times and hold. The brake line is now ready to be open. Open and let the stream of fluid come out and close the line tight. Then release brake pedal once bleeder screw is close. This procedure must be repeated twice front and back. After, brakes have been bleed pump the brake pedal before putting in drive.
Note: Don't let the resevoir run low on brake fluid. This will cause air bubbles to accumulate on the brake system. Always top off before opening bleeder screw.
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Nov 21, 2011 • 1992 Chevrolet Corsica
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1992 F250 460 cid automatic 2w drive 85000 mi. Just replaced my master cylinder, all 4 brakes, and both front rotors. Afterward I blead the brakes and got bubbles out of fluid. Problem is : when not...
There is never a test or reason to pump your brakes

Accomplishes absolutely nothing.

There is no pressure in a braking system at all,
until you SLOWLY apply the brake pedal.

Then less than 1" off movement in the master cyl,
will develop 600 to 1800 lbs at the wheels

Release the brake pedal, the system goes to zero,
IT DOES NOT HOLD ANY PRESSURE

To answer your question

You not suppost to press the pedal hard
The saying goes--you apply the brakes,
not force the pedal arm and pin into the
vacuum booster, as though you want to damage it

When your driving what happens ?
You have higher manifold vacuum and
thus your pedal is normal,why the VACUUM
brake booster

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Mar 31, 2011 • 1992 Ford F250
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Hi can you help i have a vw golf gttdi on an 02 plate ive tried everything to get the brakes working but still when i turn the engine on they go soft
they will go soft a bit when engine runs as the servo is applying a lot more pressure its normal ,make sure you have removed the rear brake drums and adjusted the back brakes up manually and the pedal will go hard and the handbrake will tighten up as well
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Nov 28, 2010 • 2002 Volkswagen Golf
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Hard brake pedal while applying brakes
with the sound of air when applying the brakes, sounds like a bad power brake booster, located behind the master cylinder,large round peice
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Jul 06, 2009 • 1996 Chevrolet Blazer
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Spongey brake
Adjust rear bake shoes ( if applicable ) some 1500's had Pads
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