2001 GMC Jimmy Logo
Posted on Sep 29, 2010
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Replaced brake line, rotors and pads bled brakes all around and the brakes when the truck is off work but once i start the truck the brake pedal goes to the floor and have no brakes at all?????????????????????

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Jeffrey Turcotte

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  • GMC Master 8,991 Answers
  • Posted on Sep 29, 2010
Jeffrey Turcotte
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You may need to pump the pedal a bit to bring the new pads into contact with the rotors. You may also have a bubble in the ABS system. There is a special procedure using an ABS scan tool:
Bleeding Procedure

Raise the vehicle in order to access the system bleed screws.
Bleed the system at the right rear wheel first.
Install a clear hose on the bleed screw.
Immerse the opposite end of the hose into a container partially filled with clean DOT 3 brake fluid.
Open the bleed screw 1 / 2 to 1 full turn.
Slowly depress the brake pedal. While the pedal is depressed to its full extent, tighten the bleed screw.
Release the brake pedal and wait 10-15 seconds for the master cylinder pistons to return to the home position.
Repeat the previous steps for the remaining wheels. The brake fluid which is present at each bleed screw should be clean and free of air.
This procedure may use more than a pint of fluid per wheel. Check the master cylinder fluid level every four to six strokes of the brake pedal in order to avoid running the system dry.
Press the brake pedal firmly and run the Scan Tool Automated Bleed Procedure. Release the brake pedal between each test.
Bleed all four wheels again using Steps 3-9. This will remove the remaining air from the brake system.
Evaluate the feel of the brake pedal before attempting to drive the vehicle.
Bleed the system as many times as necessary in order to obtain the appropriate feel of the pedal.

Mike

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  • GMC Master 4,383 Answers
  • Posted on Sep 29, 2010
Mike
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Bench Bleed the M/C first, then do not let it run dry during system bleeding. Parts stores sell a kit that helps installed m/c bleeding.

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1 Related Answer

emissionwiz

Marvin

  • 85242 Answers
  • Posted on Jun 27, 2009

SOURCE: brake pedel pushes to the floor

pump the pedal about 10 times and see if it comes back up, u need to pump the caliper pistons out after a brake job.

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Related Questions:

1helpful
2answers

Is there an answer brake pedal going to the floor after replacing front pads thought it must be the master cylinder replaced it and bleed master on bench and system

the full brake system has to be bled starting at the longest line first and ending at the shortest

when pads are replaced the piston has to be pushed all the way back into the calliper housing and the first application will always go well down as the pads are moved back out to contact the rotor
it will require several pumps for this to happen
priming the master cylinder before installing is good practice but unfortunately air sill gets into all the lines and that is why a full bleed is necessary
if you still have problems get a professional brake shop to diagnose the problem and a quote
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My 1998 ford taurus brake pedal goes straight to the floor .

Brake line busted somewhere? Is the linkage to the master cylinder intact? Master cylinder might have been installed incorrectly.
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Brake pedal goes nearly to floor front pads, calipers, brake hoses changed, rotors turned Master cylinder changed, brake booster check valve changed rear brakes checked, drums good no ridge, shoe's...

I would go with not bled correctly

The booster should hold up with a hard pedal until
you start the engine, then vacuum causes it to move
down when pressing on the brake
0helpful
2answers

Just replaced rotors, calipers, caliper brackets, and pads. Bled all four wheels, starting with the farthest away from the master cylinder working my way to the closest. Brake pedal feels firm when car...

Bleed with the car running and make sure all the air is out. Now make sure there is no leak and the pad contact are adjusted without much gap so that the calipers hold on. make sure the servo assist is correct, if so and the master cylinder was set right , it must work. Please recheck all your work once again to trim up.
6helpful
5answers

Brake pedal goes to the floor only when engine is running. Pedal is perfect with engine off.

your power brake booster is blown out
the seal has a leak in it
run the truck for 3 minutes and shut it off. with the windows up listen carefully while you gently apply the brakes
listen for a hissing sound of air leaking.
the sound of these leaking is a very soft sound
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1answer

Pistons in both front calipers stay out, both calipers replaced

You may have a leak in the booster or master cylinder. You can put a pressure tester on the system to test for leaks. It does sound like you have an air leak.
You can try to bleed the master cylinder, then slave cylinder, then brake lines.
0helpful
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1989 Ford F350 2 wheel drive dually 460 ci gas motor

5 Inspect Brake Fluid Type Brake fluid loss or contamination grey_line.gif 10 Inspect Master Cylinder (Brake System) Worn or leaking brake master cylinder. grey_line.gif 11 Inspect Brake Power Booster Damaged booster vacuum line/check valve, or diaphram
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