Brake pedal going to the floor

Tiny
BMOVRE
  • MEMBER
  • 2009 TOYOTA COROLLA
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
A car sat for two months without being driven. Went to drive the car and the pedal pulsated. Replace front rotors and pads, also found front right caliper seized, replaced caliper and bled. With the engine not running I have a hard break pedal. Start the engine and I can slow push the pedal to the floor. Bled the whole brake system and replaced fluid. Problem is still there. Replace the master cylinder for possible internal bypass and bled system again, problems still there. Try driving the car and dry payment and the car stops good. Next day it snowed so I drove car and ABS activated car stopped good. With the engine running I can slowly push the brake pedal to floor. I need help. Thanks
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Friday, November 30th, 2018 AT 8:33 AM

5 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good afternoon,

It sounds like you still have air in the system. You should get a pressure bleeder and force the fluid through the system and get rid of the rest of the air.

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

Just having someone pushing the pedal is not enough sometimes to get all the air out.

How is the reaction time of applying the brakes?

Roy
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Friday, November 30th, 2018 AT 2:24 PM
Tiny
BMOVRE
  • MEMBER
Reaction time appears normal. I used pressure blender and did not see any air coming out. Pedal still goes to floor with engine running.
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Friday, December 7th, 2018 AT 10:03 AM
Tiny
ASEMASTER6371
  • EXPERT
Sounds like you need a master cylinder. Did you do this yet?

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

Roy
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Friday, December 7th, 2018 AT 10:22 AM
Tiny
BMOVRE
  • MEMBER
Yes, I replaced master cylinder. Is there an accumulator in this ABS system explaining maybe where the fluid is going?
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Friday, December 7th, 2018 AT 2:11 PM
Tiny
ASEMASTER6371
  • EXPERT
Okay, I found that there is a accumulator and does need to be bled.

The down side is you need a scan tool to perform the process.

Roy

NOTICE:
- Use a torque wrench with a fulcrum length of 250 mm (9.84 in.).
- This torque value is effective when the union nut wrench is parallel to the torque wrench.

4. BLEED BRAKE LINE See: Brake Fluid > Removal and Replacement
5. BLEED BRAKE ACTUATOR (w/ VSC)
NOTE: After bleeding the brake system, if the specified height or feel of the brake pedal cannot be obtained, bleed the brake actuator assembly with the Techstream by following the procedure below.

(a)Depress the brake pedal more than 20 times with the ignition switch off.
(b)Connect the Techstream to the DLC3, and then turn the ignition switch to ON.
NOTE: Do not start the engine.

(c)Turn the Techstream on and select "Air Bleeding" on the screen.
NOTICE:
- Refer to the Techstream operator's manual for further details.
- Bleed air by following the steps displayed on the Techstream.

(d)Bleed air according to "Step 1: Increase Line" on the Techstream display.
NOTICE:
- Make sure that the master cylinder reservoir tank does not run out of brake fluid.
- Add brake fluid to keep the level between the MIN and MAX lines of the reservoir while bleeding the brakes.
(1)Connect a vinyl tube to either one of the bleeder plugs.
(2)Depress the brake pedal several times, and then loosen the bleeder plug connected to the vinyl tube with the pedal depressed*3.
(3)When fluid stops coming out, tighten the bleeder plug, and then release the brake pedal*4.
(4)Repeat *3 and *4 until all the air in the fluid is completely bled out.
(5)Tighten the bleeder plug completely.
Front bleeder plug - Torque: 8.3 Nm (85 kgf-cm, 73 in-lbf)
Rear bleeder plug (for Drum Brake) - Torque: 8.5 Nm (87 kgf-cm, 75 in-lbf)
Rear bleeder plug (for Disc Brake) - Torque: 10 Nm (102 kgf-cm, 7 ft-lbf)
(6)Repeat the above procedure for the rest of the wheels to bleed the brake lines.
(e)Bleed the suction line according to "Step 2: Inhalation Line" on the Techstream display.
NOTICE:
- Bleed the suction line by following the steps displayed on the Techstream.
- Add brake fluid to keep the level between the MIN and MAX lines of the reservoir while bleeding the brakes.
(1)Connect a vinyl tube to the bleeder plug at the right front wheel or the right rear wheel and loosen the bleeder plug.
(2)Operate the brake actuator assembly to bleed air using the Techstream*5.
NOTICE:
- During this step, be sure to release the brake pedal.
- The actuator operation stops automatically in 4 seconds.
(3)Check that the actuator operation has stopped by referring to the Techstream display, and tighten the bleeder plug*6.
(4)Repeat *5 and *6 until all the air in the fluid is completely bled out.
(5)Tighten the bleeder plug completely.
Front bleeder plug - Torque: 8.3 Nm (85 kgf-cm, 73 in-lbf)
Rear bleeder plug (for Drum Brake) - Torque: 8.5 Nm (87 kgf-cm, 75 in-lbf)
Rear bleeder plug (for Disc Brake) - Torque: 10 Nm (102 kgf-cm, 7 ft-lbf)
(6)For the rest of the wheels, bleed air in the same way as stated in the above procedure.
(f)Bleed the pressure reduction line according to "Step 3: Decrease Line" on the Techstream display.
NOTICE:
- Bleed the pressure reduction line by following the steps displayed on the Techstream.
- Add brake fluid to keep the level between the MIN and MAX lines of the reservoir while bleeding the brakes.
(1)Connect a vinyl tube to either one of the bleeder plugs.
(2)Loosen the bleeder plug*7.
(3)While keeping the brake pedal fully depressed, operate the brake actuator assembly using the Techstream.
NOTICE:
- The actuator operation stops automatically in 4 seconds. When performing this procedure continuously, an interval of at least 20 seconds is required.
- After the operation is completed, the brake pedal goes down slightly. This is a normal phenomenon when the solenoid opens.
- During this procedure, the pedal seems heavy, but completely depress it so that the brake fluid comes out from the bleeder plug.
- Be sure to keep the brake pedal depressed. Never depress and release the pedal repeatedly.
(4)Tighten the bleeder plug, and then release the brake pedal*8.
(5)Repeat steps *7 to *8 until all the air in the fluid is completely bled out.
(6)Tighten the bleeder plug completely.
Front bleeder plug - Torque: 8.3 Nm (85 kgf-cm, 73 in-lbf)
Rear bleeder plug (for Drum Brake) - Torque: 8.5 Nm (87 kgf-cm, 75 in-lbf)
Rear bleeder plug (for Disc Brake) - Torque: 10 Nm (102 kgf-cm, 7 ft-lbf)
(7)Repeat the above procedure for the rest of the brakes to bleed the brake lines.
(g)Bleed the brake lines again according to "Step 4: Increase Line" on the Techstream display.
NOTICE:
- Bleed air by following the steps displayed on the Techstream.
- Add brake fluid to keep the level between the MIN and MAX lines of the reservoir while bleeding the brakes.
(1)Connect a vinyl tube to either one of the bleeder plugs.
(2)Depress the brake pedal several times, and then loosen the bleeder plug connected to the vinyl tube with the pedal depressed*9.
(3)When fluid stops coming out, tighten the bleeder plug, and then release the brake pedal*10.
(4)Repeat *9 and *10 until all the air in the fluid is completely bled out.
(5)Tighten the bleeder plug completely.
Front bleeder plug - Torque: 8.3 Nm (85 kgf-cm, 73 in-lbf)
Rear bleeder plug (for Drum Brake) - Torque: 8.5 Nm (87 kgf-cm, 75 in-lbf)
Rear bleeder plug (for Disc Brake) - Torque: 10 Nm (102 kgf-cm, 7 ft-lbf)
(6)Repeat the above procedure for each brake to bleed the brake lines.
(h)Finish "Air Bleeding" on the Techstream, and then turn the Techstream off.
(i)Disconnect the Techstream from the DLC3.
(j)Turn the ignition switch off.
6. INSPECT FOR BRAKE FLUID LEAK
7. INSPECT FLUID LEVEL See: Brake Fluid > Component Tests and General Diagnostics > On-Vehicle Inspection
8. INSTALL CENTER COWL TOP VENTILATOR LOUVER See: Brake Fluid > Removal and Re
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Friday, December 7th, 2018 AT 2:20 PM

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