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Gm abs problems

On a 1998 chevy cheyenne 1500 pick up .Replaced wheel cylinders, brake booster and ABS system, only have pedal after bleeding brakes, but once truck is put in drive the pedal goes soft and barely have a traceof breaks

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Posted on Dec 19, 2013

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Posted on Jan 02, 2017

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SOURCE: 1998 chevy C-1500 brake problems

Try a clean and adjust on the rear shoes, because sometimes when they aren't properly adjusted they won't seem to work properly. Also there is a common "squishy" petal feeling after brake work on most all larger GM's around that year, wich I have run into several times. Try test driving it, and put a couple miles on it, That usualy helps.
Good luck!

Posted on Dec 17, 2008

dennymulford

Dennis Mulford

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SOURCE: brake pedal goes soft when engin is running on 1998 chevy 1500

pull your rear drums and inspect the shoes,you may have too addjust them out by hand too get the peddle you want

Posted on Mar 15, 2009

jatncbeach

  • 225 Answers

SOURCE: brake bleeding

if you didn't bleed the lines after putting the master in. then there is a good chance there is air in the lines now. may go through a quart of brake fluid before all the air is out. remember to start at r-rear/ l-rear/ r-front/ l-front last.will take some time. don't forget to adjust the rear brake while your there to help with the pedal

Posted on Aug 13, 2009

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Anonymous

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SOURCE: 97 Chevy Silverado Brake Problem

start bleding again from left to rigt all the way around.

Posted on Oct 09, 2009

Tom Ule

  • 19 Answers

SOURCE: Spongy brake pedal even after ABS bleed and base brake bleed.

Did you adjust the rear shoes out? If the rear drum brakes are out of adjustment they will give you a lot of pedal travel. If the pads are worn have no fear of that U-CLIP brake spring, just change one shoe at a time. Take the spring off one side, change the shoe, put the spring back on the post and do the same to the other shoe, no problem.

Posted on Dec 19, 2009

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1 Answer

Brake pedal soft


You still have air in the brake system and this becomes evident when the operation of the booster allows the pedal to do down as it is compressing the air in the lines more efficiently than what you can do with your foot. Try starting the bleeding procedure but undoing the lines at the master cylinder and priming the unit first to get the air out of both sides of the unit. Tighten the lines and with the help of a assistant start at the longest line first and work back to the shortest. Booster failure will result in no assistance or engine stopping from a massive vacuum leak when the valves are opened. The abs is just a motor driven pump that supplies pressure to the brake system when the wheel sensors come into operation otherwise the brake pedal pressure is operating through the ABS unit to the brakes. (An ABS is only there to keep the brake pressure constant as the sensor opens and closes a valve to stop the wheel skidding . If it is not working then pressure from the pedal may bleed back leaving you with no brakes.)

Nov 30, 2013 | Dodge Cars & Trucks

2 Answers

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.
  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.

Dec 18, 2010 | 1997 Chevrolet K1500

1 Answer

I have a 1997 chevy cavalier. I replaced wheel cylinders, brake lines, front calibers master cylinder and booster. When I bleed the brakes I only get brake fluid from the front bleeder on the ABS system. I...


sometimes if you leave the bleeder screw open it will gravity bleed the cylinder.Make sure master cyl is full and do one wheel at a time.I have seen this work, I have done it.

Nov 16, 2010 | 1997 Chevrolet Cavalier

2 Answers

'98 silverado 1500: anti-lock brakes were engaging just by turning the wheel, I replaced;calipers,flex hoses,wheel cylinders,bled them and pedal still goes to floor. Now what?


why did you change the calibers,hoses,wheel cylinders,they have nothing to do with the abs pump kicking on.Did you have a pedal before you changed all those parts?

Jan 25, 2010 | 1998 Chevrolet K1500

1 Answer

97 Chevy Silverado Brake Problem


start bleding again from left to rigt all the way around.

Oct 09, 2009 | 1997 Chevrolet K1500

1 Answer

Brake bleeding


if you didn't bleed the lines after putting the master in. then there is a good chance there is air in the lines now. may go through a quart of brake fluid before all the air is out. remember to start at r-rear/ l-rear/ r-front/ l-front last.will take some time. don't forget to adjust the rear brake while your there to help with the pedal

Aug 13, 2009 | 1998 Chevrolet C1500

2 Answers

BRAKE BOOSTER?


A bad brake booster will result in a hard brake pedal, stiff and more effort required to stop the truck. Here are my questions to you, first, you said you replaced the master cylinder, did you bench bleed it before you installed it? If not, there IS still air in it, regardless of how much you bleed the brakes at the wheels. Second, when you bled the brakes, after changing the calipers and master cyl., did you also bleed the proportioning valve? Sometimes air can get trapped in the valve, and its almost impossible to get it out bleeding just the wheels. And lastly, when the brake light comes on, does the abs light also come on with it? Air can also get trapped in the abs control module too.

Aug 11, 2009 | Chevrolet Tahoe Cars & Trucks

1 Answer

1997 FORD F250 XLT 4WD - Had a hard brake pedal with hardly any brakes while standing on them. Replaced booster and wheel cylinders at same time now the pedal is mushy and no brakes.


They need to be bleed again all four wheels but your vacuum pump may be bad since diesels don't have vacuum then have to have a pump, check that the booster one way check valve is good if you can blow thew it both ways it's bad, to bleed start from the wheel farthest away from the master cylinder pump the brakes 5 times and hold down then open the bleed valve keep doing this until you get clear fluid out of each wheel once you have done that if it is still mushy and you know you have vacuum re bleed with engine running this will help push more out with power assist. most like the hard brake pedal had to do with no vacuum check out the pump. You may also have to reset the 2 way check valve if you need help with this let me know.

May 27, 2009 | 1998 Ford F150 Regular Cab

1 Answer

1998 chevy C-1500 brake problems


Try a clean and adjust on the rear shoes, because sometimes when they aren't properly adjusted they won't seem to work properly. Also there is a common "squishy" petal feeling after brake work on most all larger GM's around that year, wich I have run into several times. Try test driving it, and put a couple miles on it, That usualy helps.
Good luck!

Dec 17, 2008 | 1998 Chevrolet C1500

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