Question about 1994 GMC Suburban

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How do you go about bleeding the breake system

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  • Master
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The easiest way is with two people.First locate the bleeder valves on the back side of each brake assembly and find the wrench that fits it properly.you will need a bottle of brake fluid per specification.Locate your mastercylinder and fluid resivoir.Have your helper get in the truck and pump the brake pedal untill the pedal pumps up and tell them to hold pressure on the pedal go to the back wheel farthest from steering wheel and open the bleeder counterclockwise it will squirt fluid out.Make sure your partner hold the pedal down untill you tighten back the bleeder.You will see the air coming out,when it stops go to the next back wheel.check orten to make sure fluid is full.Continue finishing with the wheel closest to steering wheel.when you are done you should have a full pedal,if not repeat the procedure.Good luck.

Posted on Aug 02, 2010

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Posted on Jan 02, 2017

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1 Answer

My rear back breaks won't bleed.We have replaced master cylinder,break cylinder,front&back breaks,resivor.We have the front breaks that bleed every time.My pedal goes to the floor.Any ideas?


Jennifer, some brake systems have special procedures to bleed brake systems, some systems have to be plugged into a special scan tool which will cycle different solenoids to allow proper bleeding. You may have to get a good technician with proper equipment to bleed the brakes.

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You still have air in the system.(not bled properly) If you let the Master cylinder drop down to nothing then you need to bench bleed that before bleeding the lines again.

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Probably will have to bleed the master cylinder.

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My way is to start furthest from the master cylinder & work to the closest. Make sure the master cylinder remains toped up throughout the procedure. With any luck with the lid off the master you can gravity bleed it, ie: just crack the bleed nipple & fluid should start comeing out. Let the fluid bleed a little then tighten the nipple. Repeat for all for. If it will not gravity bleed let me know & i'll give you another procedure. Gravity is best though

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WELL THE DELCO MORAINE ABS BRAKE SYSTEM HARD TO BLEED WITHOUT A TECH 1 SCAN TOOL.YOU HAVE TO RAISE PISTONS IN THE HYDRALIC MODULATOR TO THE HOME POSITION BEFORE BLEEDING THE SYSTEM. THE DEALERSHIP OR GARAGE WILL HAVE TO PRESSURE BLEED AND USE TECH 1 SCAN TOOL.IF YOU HAD THE OLD SCHOOL NON ABS BRAKE SYSTEM YOU CAN MANUAL BLEED BRAKE SYSTEM WITH NO PROBLEMS.

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You are either low on brake fluid or you have a vacum problem. It is a long shot but possible the Master Cylinder is having an issue or an air bubble in the system. Start the vehicle and make sure it is blocked. With the engine running perform system bleeds on all four calipers. Pump 3 times then release bleed valve. You are going to need a couple bottles of brake fluid to bleed all these calipers and get the air out of the lines. You should make sure the primary vacum is connected to the master cylinder and that there are no leaks on any lines before you start the bleeding process.

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There is probably still just some air in the system, it only takes a small amount to have no pedal. Did you bench bleed the master cyl before installing? Start bleeding the brakes again, start with the wheel the greatest distance from the master cyl. bleeding until no air is evident, working your way closer to the master cyl, doing the closest wheel to it last. Check all the new brake line connections. A slightly loose connection would allow air into the system, making it impossible to bleed it all out. Make sure the master cyl level never drops too low, or you will be pulling in air and have to start all over. Good luck.

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could be could be broken lines or rear drum cylrnder problems look underneath for leaks.

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http://www.popularmechanics.com/automotive/how_to/4213448.html

go here and follow the instructions and thats the best way to bleed the brake system

Jul 24, 2009 | 2007 Nissan Quest 3.5 Minivan

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