Question about 1997 Chevrolet K1500

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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 ?

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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.

  1. Perform the manual brake bleeding procedure. Refer to Bleeding the Brake System (non-ABS).
  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.

Posted on Dec 18, 2010

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Brakes wont work after replacing everything new on the truck wheel cylynders brake pads all around master cylynder brake shoes front caliper and rotors and brakes wont work at all all the way to the floor

Posted on Jul 14, 2011

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Brake pedal is intermittent spongey on my 2005 silver ado Z71


One of two issues are typical. Either a bad wheel cylinder(s), or a bad Master Cylinder. The sponginess is caused by air or some other contaminant in the hydraulic fluid. It's intermittent because the more often you use the brakes, the hydraulic pressure is built up. If you pump the brakes before stopping, the sponginess will be less. Check all brake cylinders, and Master Cylinder, and possibly a complete Brake system fluid flush.

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Check the brake fluid level in the master cylinder. If it's low or empty refill it and check for a leak. If the master cylinder is full of fluid the cylinder itself could be bad.

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Brake pedal goes to floor


From the symptom you have stated, there is a problem with brake system. You have not mentioned whether you have any braking effect on the vehicle when the brake pedal goes to floor. Anyway, you may check the following:
1. Check brake fluid level in the brake fluid reservoir. If the level is less, then you have to go to a garage as just filling up the fluid will not help and the brake hydraulic system needs bleeding.
2. Get the brake adjustment of all the wheels checked by an experienced garage mechanic.
3. Get the Brake Master and Wheel cylinders checked by an experienced garage mechanic.
4. The brake liners might be worn out. Get the same checked by an experienced garage mechanic.
5. Brake pipes which convey brake fluid from Master cylinder to the wheels might be leaking. Get the same checked by an experienced garage mechanic.
Whatever may be the cause of the symptom, do not use your vehicle till you get the problem solved as you are accedent prone without the brake system proper functioning.
Good luck..

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Brakes are going to the floor most of the way checked rear brakes and they are still good bleed them and problem still there


Normally when the brake pedal goes almos to the floor it is an indication of low brake fluid. Low brake fluid is an indication that front and/or rear brakes are wearing. As the brake pads wear down more brake fluid will be required in the wheel cylinders or calipers. Hint, the front brakes usually wear much faster than the rear due to the fact that the fronts due a much greater braking function that the rear. Check the front pads. Don't let them get down to the metal scraping metal stage before you change them out. This causes unnessary damage to the rotors. Look at your master cylinder on the firewall under the hood in front of the steering wheel. If the fluid level is belowhte "max" mark add fluid. Low fliud should also show as a red "brake" light on your dash, but not always.

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Hi:
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After that then have someone get in car and pump up brakes, you then bleed them one at a time.
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

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