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Chevy k10 1978 brake pedal slow on the return no brakes

No brakes pedal when pressed just goes to the floor when released it acts like there is suction as it slowly rises bleed the brakes and nothing any help to lead me to my next venture would be great

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  • Jay Plesset Apr 24, 2015

    Add brake fluid. Bleed air out of system. Does it bleed, or does nothing come out the bleed ports when brake pedal is pumped? Does brake fluid come out the master cylendar?

  • JaMes Bryant
    JaMes Bryant May 30, 2015

    yes fluid is present at all bleeder valves

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  • Chevrolet Master
  • 14,585 Answers

Let me save you a lot of headaches. First it is a 78. If it runs good and you absolutely want to keep it. Just replace all of it. Master cylinder, brake pads and shoes, brake lines, calipers, brake cylinders, brakes hoses, drums, and rotors. This will save you loads of time, just do it all at once. Yeah it's costly. About $400 in parts. But you don't have to worry about brakes not stopping you because you only fixed one thing. You will eventually replace all of these parts any way. Let it sit , if you can, and get all the parts together and do the job. This would cost $1200+ at a shop.

Posted on Apr 24, 2015

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  • Chevrolet Master
  • 2,826 Answers

Sounds like a bad master cylinder.

Posted on Apr 23, 2015

  • JaMes Bryant
    JaMes Bryant Apr 24, 2015

    Is there a easy way to test so I am not throwing money away on new parts

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1 Answer

How to fix brakes that goes to the floor after i replaced the master cylinder


You must have air in the brake lines. You will have to bleed the lines to get the air out. You will have to locate the bleed valve near each wheel. It is easier to take off the wheel so you can see everything. The brake line will have a drain screw near the place that the line goes into the brake caliper assembly. You will need a helper. Loosen the screw a bit then have your helper press the brake to the floor. Fluid and/or air will come out. While they hold it to the floor, tighten the screw so it won't such air back in when the brake peddle is released. With the brake pedal released, open the drain screw again and have the helper press the brake to the floor again. Repeat this until no more air comes out when the brake pedal is pressed. Then move to the next wheel and repeat. During the process make sure that the fluid in the master cylinder does not run out. The level will drop each time you bleed some of it from the bleed valve (or drain screw or whatever you want to call it). It helps to open the drain screw just enough to let a little fluid out. You won't waste as much that way. By time you get through with the last wheel the brake should not go to the floor anymore.

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sounds like you are low on brake fluid and probably have a leak someplace in the system. i would suggest not driving it till its fixed right.

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First, check your brake fluid levels, if it is low then that enplanes your problem. Also, when was the last time you had the brakes changed? if the are worn down, then this will also cause a low fluid level. if the brakes are fine and the fluid level is good and you still have the same issue, then your problem is probably your master cylinder. Brake boosters hardly ever go bad.

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My 1997 chevy 1500 z71 brakes suddenly going all the way to the floor. Checked brake fluid and it was low. Could be wheel cylinder? Master cylinder? or ?


well, check the brake lines for leakage after adding brake fluid to the full mark. If the brake pedal goes all the way to the floor, it's likely there is a leak somewhere after the master cylinder. If the pedal gets hard after adding fluid, and pumping it several times with the car off, then the master cylinder is still ok.

If air has gotten into the master cylinder, it may have to be bled out on a bench, or using a scanner if that's the way your vehicle is.

Bleeding the Brake System (ABS) Auto Bleed Procedure NOTE: Perform a manual bleeding procedure. If the brake pedal height and firmness results are not achieved, perform the auto bleed procedure below.
NOTE: Perform this procedure when replacing the brake pressure modulator valve or electro-hydraulic control unit.
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  2. Check the master cylinder fluid level often to prevent running the system dry.
  3. Press the brake pedal firmly and run the Scan Tool Automated Bleed Procedure (for Gas engines) once, or the Function Test (for Diesel engines) four times. Make sure to release the brake pedal between each test.
  4. Perform the manual bleed procedure again. This should remove the remaining air from the brake system.
  5. Bleed the system as many times as needed to obtain the appropriate feel of the brake pedal.

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you either have air in the brake lines, a cracked brake line, or low of brake fluid... either way you will need to bleed the brakes

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Parking brake pedal goes to floor


Hello;
The parking brake cables may be stretched and in need of adjustment. Follow the cables along to a nut. Then you can tighten the adjusters up on both sides until you have the proper tension. Also make certain none of the brackets are bent or broken that the cables ride through.
Thanks;
RPM Northwest

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