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Anonymous Posted on Jul 13, 2014

Brake pedal goes hard

Why at 40mph the brake pedal is hard to push down but when the car slows up the pedal will work ok then, what causes that?

1 Answer

Dennis Mulford

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  • Master 1,055 Answers
  • Posted on Jul 27, 2016
Dennis Mulford
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Joined: Jan 24, 2009
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Bad booster, or vaccumme leak

5 Related Answers

Anonymous

  • 73 Answers
  • Posted on Mar 13, 2009

SOURCE: emergency brake foot pedal not working

Sounds like the cable is stuck also check the catch on the foot pedel

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co7196

Ned C Cook

  • 3433 Answers
  • Posted on May 25, 2009

SOURCE: hard brake pedal hear air leaking when pedal pushed

When you press on the brake? Have your brake vacuum assist checked. It,s that bigspaceship looking thing between the brake master cylinder an firewall. good luck and be safe.

Anonymous

  • 1 Answer
  • Posted on Jun 21, 2009

SOURCE: Parking Brake problem

2000 S-10: brake functions properly while pedal is held down, but when I remove my foot, the brake is released.
The following is not a repair so much as a solution to the basic problem and I guess it won't pass scrutiny of any state inspection. Nevertheless, this idea may skip around the automatic pedal stop malfunction and buy you some time while a proper part replacement is arranged.
The release cable ends at the ratchet assembly by the pedal and the lever which receives it can be pushed forward before depressing the pedal thereby engaging the stop which will hold the pedal down and keep the brake engaged. There is no click, or catch evident when the release lever is moved forward and it only moves a little bit.
Not the easiest reach from the driver’s seat. Also, the release cable is likely to jump out of its place if you just reach blindly and push.
From what I've read on this site, there are some design issues with the ratchet mechanism that commonly lead to failure of the pedal stop function.
Hopefully this will help those who still want to park on a hill.

Anonymous

  • 1 Answer
  • Posted on Dec 27, 2009

SOURCE: my brakes make a hissing noise inside by the pedal

i need a diagram of my brake line system on my 1997 chevy venture

kirkx

Kirk Augustin

  • 2019 Answers
  • Posted on Jul 08, 2010

SOURCE: my brakes are hard to push down and it sounds like

This one I can be fairly certain of. It sounds like a rip in the vacuum power brake booster diaphram. Usually you just replace the whole power brake chamber, which includes the diaphram. You have to first remove the 2 bolts holding the master cylinder to the larger booster chamber, but you don't normally have to open any brake lines.
When replacing, make sure the brake pedal rod goes down the center of the new booster, and that there is sufficient clearance or freeplay in the pedal rod when done. (like .1" is all you need)
Should not have to bleed after done.

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Related Questions:

1helpful
2answers

What is the problem brakes solid and just rolling, after 2 mins was ok "?"

Hi .
Brake booster or master cylinder so try the foot brake with engine off ,pedal should be hard now rest your foot on brake pedal and push down and start engine and the pedal should go down about 3cm
if it goes down but the car still rolls then you have a master cylinder problem.
Answer go to the brake people as your life is in danger.
3helpful
3answers

Are there vacuum hose on the brakes hydraulic system?

NO. the vacuum is used to make the brake pedal easy to push, power brakes. the pedal would be hard without vacuum, that is why the pedal gets hard with the key off and engine not running. the problem you are having is more of a hydraulic problem.
Have the brakes checked asap. the brake system may have a leak causing the pedal to go low. check the fluid level and if it is low or empty then there is a problem, could be a rotted brake line leaking or a wheel cylinder leaking.
0helpful
1answer

When i push on break pedal its hard to push down and there is air leaking from down by pedal

need to replace the power brake booster. the vacuum diaphragm in the booster has bursted causing the noiseand the hard brake pedal.
1helpful
1answer

My brake peddel is spongee-soft, and goes to the floor if i prees hard?

when you push pedal hard & pedal goes to floor does brake light come on?
assuming brake fluid leval is ok & didnt run empty have you checked for a leak?
pulling all wheels & inspecting brakes,cylinders, calipers,& lines for leaks.
does the pedal pump up & feel ok with engine running?if so there is air in the system
if it does'nt change the way the pedal feels & no leaks are found & brake linings are ok & adjusted
properly than your master cylinder is leaking internally & needs to be replaced
1helpful
2answers

My Lincoln Navigator 2003 has an air leak somewhere, however when I push the brake I don't hear it, but if the brake is pushed too long it goes down to the floor. What do I need to do to fi it?

i think your brake booster is gone i am not to sure where they are on the navigator but thats what will sound like air leaking when the booster goes bad
0helpful
3answers

How brakes work

the brakes slows the movement of the car then the trans and engine slows with that I guess you know you have brakes on all 4 wheels by braking you are slowing down the wheels
0helpful
2answers

Breaks will not work at random times?

YOU HAVE A BAD MASTER CYLINDER
HAVE IT REPLACED AHD YOU PROBLEM WILL GO AWAY
1helpful
1answer
0helpful
1answer

2003 dodge dakota

check 2 things first one is their is a plastic check valve that is inserted into the booster (under your hood) then goes to a vaccum line ,then to the engine, pull it out of the booster and check the valve it should be L - shaped. it might have a hole in it causing a vaccum leak. be carefull pulling it out not to break it just pull straight out. if that is ok put it back in. then your problem is going to be the brake booster the big black round case. sometimes the diaphram inside the booster rips causing a vaccum leak which causes a hard brake pedal and you have to stand on the pedal to stop. then you will have to repace the whole thing but not the master cylnder unbolt master cylder with the brake lines connected, the lines will give then disconnect brake pedal arm under dash inside of trk their should be 2 nuts or 4 buts under dash on inside of firewall near brake pedal then remove booster pulls out from under hood. there is not much to replacing them.
0helpful
1answer

Brake problem in pedal

you did'nt say why you changed the rf brake hose, but i'm assuming it was leaking, check to make sure the new one is not leaking and there is no other leaks in the system, this includes the other 3 calipers and hoses, the rear hose in between the rear hard line on the frame to the rear hard line on the rear axle. if there is still air in the right side line then the left side would be doing all the work and may cause your abs to kick in on the left side if it is attempting to lock up. this may be the noises you are hearing. if you still have power brakes after you shut the engine off, (you should be able to pump the pedal 3 or 4 times with the engine off before the pedal becomes hard) then the booster is ok. if it has a swooshing sound inside the car, (hard to describe that sound on a keyboard), then you may have a leak in the seal on the brake pedal side of the booster. brake master cylinder sounds like it is bypassing. if it still goes to the floor after you rebleed then replace the master cylinder. if a brake pedal goes all the way to the floor, it is possible to ruin the cylinder and cause it to bypass, this is caused by rust or corrosion, the seals on the plunger are compromised letting brake fluid leak past. any other questions please let me know. thanks
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