After having all hard lines replaced the brake pedal goes to the floor

KENM2

MEMBER
2000 BUICK LESABRE
3.8L
6 CYL
2WD
AUTOMATIC
189,000 MILES

I had all hard lines replaced. When I got the car back, the brakes seem to work fine, but when holding pressure on the pedal, it will go all the way to floor. Mechanic bled system again, but still after pumping pedal several times with pedal stopping where it should, if maintaining pedal pressure it will go to floor. My guy says this is normal. I do not think so or is it?

1 Reply

ASEMASTER6371

MECHANIC
52,797 POSTS

Good afternoon.

It does sound like you have air in the system. Did they bleed the ABS system?

Roy

Bleeding the ABS/TCS System
Perform a manual or pressure bleeding procedure. Refer to Hydraulic Brake System Bleeding. If the desired brake pedal height results are not achieved, perform the auto bleed procedure below.
The auto bleed procedure is used on Delco Bosch 5.3 equipped vehicles. The procedure cycles the system valves and runs the pump in order to purge the air from the secondary circuits normally closed off during non ABS/TCS mode operation and bleeding. The auto bleed procedure is recommended when air ingestion is suspected in the secondary circuits, or when the BPMV has been replaced.

Notice: The Auto Bleed Procedure may be terminated at any time during the process by pressing the EXIT button. No further Scan Tool prompts pertaining to the Auto Bleed procedure will be given. After exiting the bleed procedure, relieve bleed pressure and disconnect bleed equipment per manufacturers instructions. Failure to properly relieve pressure may result in spilled brake fluid causing damage to components and painted surfaces.

1. Raise the, vehicle on a suitable support. Refer to Vehicle Lifting.
2. Remove all four tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation.
3. Inspect the brake system for leaks and visual damage. Refer to Brake Fluid Leak or Brake System Diagnosis. Repair or replace as needed.
4. Inspect the battery state of charge. Refer to Battery Inspection/Test.
5. Install a scan tool.
6. Turn ON the ignition, with the engine OFF.
7. With the scan tool, establish communications with the ABS/TCS system. Select Special Functions from the ABS/TCS menu. Select Automated Bleed from the Special Functions menu.
8. Bleed the base brake system. Refer to Hydraulic Brake System Bleeding.
9. Follow the scan tool directions until the desired brake pedal height is achieved.
10. If the bleed procedure is aborted, a malfunction exists. Perform the following steps before resuming the bleed procedure:
If a DTC is detected, refer to Diagnostic Trouble Code (DTC) List/Type and diagnose the appropriate DTC.
If the brake pedal feels spongy, perform the conventional brake bleed procedure again. Refer to Hydraulic Brake System Bleeding.
11. When the desired pedal height is achieved, press the brake pedal in order to inspect for firmness.
12. Remove the scan tool.
13. Install the tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation.
14. Inspect the brake fluid level. Refer to Master Cylinder Reservoir Filling.
15. Road test the vehicle while inspecting that the pedal remains high and firm. Refer to Diagnostic Test Drive.
Notice: The Auto Bleed Procedure may be terminated at any time during the process by pressing the EXIT button. No further Scan Tool prompts pertaining to the Auto Bleed procedure will be given. After exiting the bleed procedure, relieve bleed pressure and disconnect bleed equipment per manufacturers instructions. Failure to properly relieve pressure may result in spilled brake fluid causing damage to components and painted surfaces.