Question about 1996 Chevrolet C1500

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Brake peddel seems to sink to the floor and you have to pump it to stop

I bled the lines and it was good for a day and then it started again what i am asking is the master ciylinder gone
(i think it is becase if i take the cap off and push on the peddle firmly it will blow all the fulid out and i don't know if it supose to do that or not.there are no external leaks in the system and brand new break pads also the fan heater fan onlt woks on high it is also band new

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  • chuck78mac Oct 16, 2008

    i changed the brakes after i bled it do i have to do it again

  • Anonymous Oct 16, 2008

    have a 97 tahoe same problem ex changed m c bench bled it put it in ,bled the whole system ,pedal still sinks

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  • Master
  • 360 Answers

Master cylinder and you need a blower motor resistor good luck justuscc

Posted on Oct 16, 2008

  • Jimmy
    Jimmy Oct 16, 2008

    if u bench bleed the new one you wont have to do the whole system........ you pump up the brakes and hold have some one crack the lines loose at the master cylinder one at a time repump for the other line good luck justuscc

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1 Answer

Brake pedal goes to floor


for the pedal to go to the floor there is still air in the brake system. Start again starting from the longest line bleeding each in turn to the shortest line . make sure you have adjusted up the rear brakes before bleeding as every time you press on the pedal the shoes expand right out and when you take your foot off the pedal the shoes go all the way back in. adjust them manually and do not rely on the self adjuster as it only adjusts on wheel movement

Jul 15, 2013 | 2002 Ford Explorer Sport Trac

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Had a clogged brake line changed it bled system no peddel changed calopper still no peddel changed master cylinder got peddel then i start truck loose peddel changed master cylinder again and the same...


You have to have the engine running to bleed brakes

Your need a helper to push the pedal while you crack
open the bleeders

Have to do all 4 corners

Just not bleed,have air in system

Never needed all those parts & you didn't have
a clogged brake tube.

May 25, 2011 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

After having changed the rear brake shoes and wheel cylinders, and bled them the pedal was good. Then the pedal was going to the floor slowly so I had to pump the brakes to get enough stopping power....


It sounds that you have done a pretty good job at this point. Remember that the brake adjustment will dictate the amount of brake pedal. Recheck to make sure the right brake linings were used. Recheck to make sure the brakes on the rear are adjusted up as far as possible. As far as the bleeding, I have had many cars that will not bleed the sytem without the engine running to give it the pressure needed to pass through the master cylinder and lines. Have a WELL ventilated area, car in neutral, wheels chocked, and bleed the brakes with the engine running. Remember to take all safety precautions to avoid injury before attempting this.

Dec 29, 2010 | Honda Civic Cars & Trucks

1 Answer

My brake light stays on and no brakes. replaced brakes, bled, replaced line, bled..works for a day or so and then brakelight comes on and no brakes again..what could be making this happen????


Check the master cylinder and if it's low again, check system for leaks...likely you have another you didn't see...Also check the rear of the master itself for seepage. If you can pump the brake and get the pressure back but it then sinks down while holding moderate pressure on it, the cylinder itself is bypassing.

Dec 01, 2010 | Jeep Grand Cherokee Cars & Trucks

1 Answer

New master cylinder and booster. Brakes stop good


Well if you have bled it correctly starting at the farthest out(PS Side Rear) and working to the closest(DR Side Front) and you make sure to close the bleeder valve before letting up and repumping the peddel,then I would say that the seals in your new master cylinder may be bad.When you bled the second or third time if there was no air then I would say you have a bad master cylinder.If there was air then you have another problem.Well hope this helps and good luck.

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3 Answers

Brake pedal going to floor need help finding out what it is


Most likely there is air in your brake lines. You must have them bled.
I have yet to find a good brake shop that can do this right. Make sure they road test it. If it doesn't work right when you drive it, take it back and make them do it right or get a refund.

Your master brake cylinder can also be worn; however, the pedal will sink to the floor slowly and you will be able to "pump" the brake pedal.

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3 Answers

Bleed brakes but no pedal


Good! You bled the master cyl. before installation! The proper order of bleeding the lines, is to start with the wheel the greatest distance from the master cylinder. Then work your way to the next greatest distance, and last, the closest wheel. Make sure all air is removed from the lines before you proceed to the next wheel, and frequently check the master cyl. level, because, as I'm sure you know, if you **** in air at the master, you have to start all over again. I'm assuming you don't have a power bleeder, so with a helper do this with car running (make sure it's on safety stands and not going to fall on you!) Pump pedal 3 times, no need to mash the pedal into the floor, just 3 pumps 1/2 way down, hold 3rd pump at half way down level while bleeder is opened, when flow is about to stop at bleeder, close bleeder and repeat til no evidence of any air. Let me know how it goes and if you need any help.

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1 Answer

Trouble Bleeding Break Line


you need to hold in the metering valve.when you bleed the front brakes.long as the valve closed off you wont be able to bleed front brakes.better to get extra help.hard to bleed by your self .

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2 Answers

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sense its a deisel i would go with the vacume pump, diesels don't put out any or very little vacume, if you don't have vacume than booster won't work hense hard peddel. when you say you let up on peddel and hit it again you got better break tells me it is not getting enought vacume to booster. i would go for the vacume pump.

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