20-BR-001H
Service Bulletin Details
Public Details for: 20-BR-001H
This bulletin describes the procedure to properly bleed the brakes on sonata hev/phev (lf) and ioniq ev/hev/phev (ae) vehicles. This procedure applies when any air is introduced into the active hydraulic boost (ahb) system, which consists o
Models from 2019
2019 HYUNDAI IONIQ ELECTRIC |
2019 HYUNDAI IONIQ HYBRID |
2019 HYUNDAI IONIQ PLUG-IN HYBRID |
2019 HYUNDAI SONATA HYBRID |
2019 HYUNDAI SONATA PLUG-IN HYBRID |
Models from 2018
2018 HYUNDAI IONIQ ELECTRIC |
2018 HYUNDAI IONIQ HYBRID |
2018 HYUNDAI IONIQ PLUG-IN HYBRID |
2018 HYUNDAI SONATA HYBRID |
2018 HYUNDAI SONATA PLUG-IN HYBRID |
Models from 2017
2017 HYUNDAI IONIQ ELECTRIC |
2017 HYUNDAI IONIQ HYBRID |
2017 HYUNDAI SONATA HYBRID |
2017 HYUNDAI SONATA PLUG-IN HYBRID |
GROUP BRAKES DATE Technical Service Bulletin SUBJECT: FEBRUARY, 2020 NUMBER 20-BR-001H MODEL(S) Ioniq Electric/Hybrid/Plug-in (AE EV/HEV/PHEV) Sonata Hybrid/Plug-in (LF HEV/PHEV) SONATA HEV/PHEV AND IONIQ EV/HEV/PHEV BRAKE BLEEDING PROCEDURE This bulletin supersedes TSB 18-BR-003 to include noise diagnostic and repair information. Description: This bulletin describes the procedure to properly bleed the brakes on Sonata HEV/PHEV (LF) and Ioniq EV/HEV/PHEV (AE) vehicles. This procedure applies when any air is introduced into the Active Hydraulic Boost (AHB) system, which consists of the pressure supply unit (PSU), and the integrated brake actuation unit (IBAU). Improper bleeding of the brake system can result in the presence of air, which may reduce braking effectiveness. Applicable Vehicles: All Sonata Hybrid (LF HEV) and Plug-In Hybrid (LF PHEV) vehicles. All Ioniq Hybrid (AE HEV), Plug-In Hybrid (AE PHEV), and Electric (AE EV) vehicles. Circulate To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service Advisors, Technicians, Body Shop Manager, Fleet Repair SUBJECT: SONATA HEV/ PHEV & IONIQ EV/HEV/PHEV BRAKE BLEEDING SST Information Description Picture Active Hydraulic Boost (AHB) Brake Air Bleeding Tool Part Number: 09580-3D100 Active Hydraulic Boost (AHB) Brake Air Bleeding Tool Adapter Part Number: 0K585-E8100 NOTE: The special service tools listed above are available for order through Bosch: 1-866-539-4248. Warranty Information: Model Op Code Operation Op Time Causal Part # Nature Code Cause Code BRAKE FLUID REPLACEMENT OR Refer to Refer to the 58700A00 AIR BLEEDWEBLTS Applicable ADJUSTMENT for Vehicles list current ADDITIONAL TIME on page 1 LTS time 58700AH1 FOR HYBRID BRAKE BLEEDING 58500* N32 C26 *Refer to the applicable parts catalog for full causal part numbers TSB #: 20-BR-001H Page 2 of 14 SUBJECT: SUBJECT: SONATA HEV/ PHEV & IONIQ EV/HEV/PHEV BRAKE BLEEDING AHB System Noise IBAU: When the driver depresses the brake pedal, the IBAU opens a valve to transfer brake fluid pressure from PSU to the brake calipers. During this operation, some system noises can be heard. Most of these noises are normal. See below table for more information. Noise Type 1. Honking/Hissing https://www.youtube.com/watch?v=_3zQy9OhzwI 2. Click/Snap/Tok https://www.youtube.com/watch?v=Qkmz10w4DgI 3. Beep/Squeal https://www.youtube.com/watch?v=Fl40nnDDJyY 4. Groan https://www.youtube.com/watch?v=Y9iGJ8Suoqk PSU: Maintains brake fluid pressure between 160~180 bar using an electric motor. The operation of the electric motor may cause a normal noise to be heard during hydraulic pressure charging. Cause Presence of fine air bubbles in the system Image Repair Perform brake bleeding procedure described in this TSB. Noise when high pressure fluid passes through the valve Coil vibration noise when operating This is not a brake squeal from the pad/rotor interface. No repair necessary, these are normal system operation noises. PSU motor operation noise when charging pressure TSB #: 20-BR-001H Page 3 of 14 SUBJECT: SUBJECT: SONATA HEV/ PHEV & IONIQ EV/HEV/PHEV BRAKE BLEEDING Service Procedure Brake Bleeding: NOTE The brake system consists of 3 distinct hydraulic sections: low pressure, high pressure, and brake simulator sections. Because of this, the air bleeding procedure must be performed in the sequence described below. Air Bleeding Sequence: Step 1: AHB System Bleeding (IBAU ECU OFF) Step 2: AHB System Bleeding (IBAU ECU ON) Step 3: GDS Fluid Circulation Mode Step 4: GDS Pedal Travel Sensor Calibration Service Procedure Brake Bleeding Step 1: AHB System Bleeding (IBAU ECU OFF) 1. Ensure brake fluid reservoir level never drops below the halfway point between MIN and MAX. If the level drops below this point, there is a risk of air being introduced into the system, and the bleeding procedure must be started over. Ensure fluid level never drops below halfway between MIN and MAX NOTE Use DOT 3 or DOT 4 brake fluid. TSB #: 20-BR-001H Page 4 of 14 SUBJECT: SUBJECT: 2. SONATA HEV/ PHEV & IONIQ EV/HEV/PHEV BRAKE BLEEDING Disconnect the IBAU connector (A). A Sonata A Ioniq 3. With the air flow valve closed (as shown in image below), connect the pressurized brake bleeder tool (09580-3D100) to the brake fluid reservoir using the adapter (0K585-E8100). Air flow valve (closed) SST 0K585-E8100 Compressed air TSB #: 20-BR-001H SST 09580-3D100 Pressure regulator Page 5 of 14 SUBJECT: SUBJECT: 4. SONATA HEV/ PHEV & IONIQ EV/HEV/PHEV BRAKE BLEEDING With the air flow valve closed, connect a compressed air source. Regulate the air pressure to 50 psi. Open the air flow valve to pressurize the brake system. After the system is pressurized, inspect the integrated brake actuation unit (IBAU) and pressure source unit (PSU) fittings for leaks. Repair any leaks found before continuing with bleeding procedure. NOTE Always keep the air flow valve closed when connecting to a compressed air source. Open the valve as the last step. When removing pressure from the system, close the valve first before removing the compressed air source. 5. With the brake system pressurized, begin the bleeding procedure starting at the bleeder located at the PSU. Bleed the fitting until no air bubbles appear in the fluid. IBAU PSU bleeder PSU bleeder TSB #: 20-BR-001H Page 6 of 14 SUBJECT: SUBJECT: 6. SONATA HEV/ PHEV & IONIQ EV/HEV/PHEV BRAKE BLEEDING After bleeding the PSU, move to the IBAU. 1. Start bleeding at the LOWER port. Bleed until no air appears in the fluid. 2. Then, move onto the UPPER port. Bleed until no air appears in the fluid. 1st bleed the lower port of the IBAU. 2nd bleed the upper port of the IBAU. 7. Starting at the rear right wheel, attach a clear hose to the brake bleeding nipple. The other side of the hose should be immersed in a bottle partially filled with clean brake fluid. While pressurized with compressed air, bleed the brakes at each wheel in the correct sequence: 1. Rear Right 2. Front Left 3. Rear Left 4. Front Right Do not pump the brake pedal during this procedure. Use only air pressure to bleed. Repeat this sequence until no air bubbles appear in the fluid. Remember to maintain proper brake fluid level in the reservoir at all times. NOTE Bleeder screw tightening torque: 6.9~12.7 N.m (0.7~1.3 kgf.m, 5.1~9.4 lb-ft) TSB #: 20-BR-001H Page 7 of 14 SUBJECT: SUBJECT: 8. SONATA HEV/ PHEV & IONIQ EV/HEV/PHEV BRAKE BLEEDING Perform a second cycle of bleeding, this time with an assistant pressing on the brake pedal (and the SST still applying air pressure), as follows: 1. Starting at the IBAU lower port, depress the brake pedal five times and hold. Open the bleeder to bleed out any remaining air in the system. Close the bleeder before removing brake pedal pressure. 2. Repeat the above procedure 10 times. 3. Move onto the upper port, and bleed 10 times in the same fashion (applying brake pedal pressure). 4. After completing the IBAU bleeding, move to the calipers. Start at the right rear caliper, and bleed 10 times in the same fashion (applying brake pedal pressure). 5. Repeat this for the rest of the calipers in the order previously described. 6. Remove the SST and top off the brake fluid reservoir. Service Procedure Brake Bleeding Step 2: AHB System Bleeding (IBAU ECU ON) 9. Reconnect the IBAU connector. ESC OFF button Enable the IBAU ECU Air Bleeding Mode according to the following: 1. Turn the ignition ON. 2. Press and hold the ESC OFF button. Wait for the “Traction & Stability Control disabled” message to be displayed, and continue holding the ESC OFF button. 3. While still holding the ESC OFF button, depress and release the brake pedal from rest position to fully applied (40mm or more) 10 times. 4. Release the ESC OFF button. 5. Turn the vehicle ignition OFF. 6. Turn the vehicle ignition back ON. 7. Press and hold the ESC OFF button until “Traction & Stability Control disabled” is displayed. TSB #: 20-BR-001H IBAU ECU Air Bleeding Mode is established when the ABS and ((!)) lamps are illuminated. Page 8 of 14 SUBJECT: SUBJECT: SONATA HEV/ PHEV & IONIQ EV/HEV/PHEV BRAKE BLEEDING 8. The IBAU ECU Air Bleeding Mode should now be enabled. Verify by observing that the ABS and ((!)) lamps are illuminated on the gauge cluster. 10. NOTES The IBAU Air Bleeding Mode can only be enabled under the following conditions: - All doors, the hood, and the trunk or hatch must be closed. - The procedure to enter bleeding mode must be completed within 30 seconds. With the IBAU Air Bleeding Mode enabled, perform the following: For vehicles equipped with standard parking brake (non electric parking brake EPB): 1. Connect the SST and apply air pressure, as previously described. 2. Have an assistant press the brake pedal about half the stroke and hold. 3. Starting at the right rear caliper, open the bleeder screw to bleed the line. 4. Close the bleeder screw, then release the brake pedal. 5. Repeat steps 2 through 4 at least ten times, until no bubbles appear. 6. Move onto the next calipers in the correct bleeding order, and repeat the same procedure until all four calipers have been bled. 7. Remove the SST, top off the brake fluid, and replace the reservoir cap. 8. Cycle the ignition OFF, then ON again to disable the IBAU ECU Air Bleeding Mode. For vehicles equipped with electric parking brake (EPB): 1. Connect the SST and apply air pressure, as previously described. 2. Start at the right rear caliper. 3. Have an assistant press the brake pedal about half the stroke and hold. 4. While holding the brake pedal, have the assistant apply and release the EPB using the switch in the vehicle. TSB #: 20-BR-001H Page 9 of 14 SUBJECT: SUBJECT: SONATA HEV/ PHEV & IONIQ EV/HEV/PHEV BRAKE BLEEDING 5. Gently tap the rear caliper with a rubber mallet to release any potential trapped air bubbles. 6. Open the bleeder screw to bleed the line. 7. Close the bleeder screw, then release the brake pedal. 8. Repeat steps 3 through 7 at least ten times, until no bubbles appear. 9. Move to the next caliper and repeat steps 3-8 (skipping 4 and 5, which only apply to EPB rear calipers). 10. Move onto the next caliper in the correct bleeding order, and repeat the same procedure until all four calipers have been bled. 11. Remove the SST, top off the brake fluid, and replace the reservoir cap. 12. Cycle the ignition OFF, then ON again to disable the IBAU ECU Air Bleeding Mode. Service Procedure Brake Bleeding Step 3: GDS Fluid Circulation Mode IMPORTANT Before attempting to perform the Fluid Circulation Mode, ensure that the auxiliary battery is fully charged (higher than 12V). If the battery is not fully charged, connect it to a charger as needed. 11. Connect a tablet-based GDS to the vehicle as per the installation instructions found in TSB 15-GI-001. Connect the VCI to the tablet using the USB cable. Perform the Fluid Circulation Mode, as follows: 1. Select S/W Management. TSB #: 20-BR-001H Page 10 of 14 SUBJECT: SUBJECT: SONATA HEV/ PHEV & IONIQ EV/HEV/PHEV BRAKE BLEEDING 2. Select Fluid Circulation Mode. 3. Read the caution statement and click OK to continue. 4. Read the summary of the process and click OK to continue. TSB #: 20-BR-001H Page 11 of 14 SUBJECT: SUBJECT: SONATA HEV/ PHEV & IONIQ EV/HEV/PHEV BRAKE BLEEDING 5. Read the description of the process and click OK to continue. 6. Read the conditions and cautions, then click OK to continue. TSB #: 20-BR-001H Page 12 of 14 SUBJECT: SUBJECT: SONATA HEV/ PHEV & IONIQ EV/HEV/PHEV BRAKE BLEEDING 7. The fluid circulation process will begin. Chattering and clunking noises are normal. The process lasts about 20 minutes. Click OK when finished. 8. Check and clear any DTC(s). Service Procedure Brake Bleeding Step 4: GDS Pedal Travel Sensor Calibration 12. Connect a tablet-based GDS to the vehicle as per the installation instructions found in TSB 15-GI-001. Connect the VCI to the tablet using the USB cable. Perform the Pedal Travel Sensor (PTS) Calibration as follows: 1. From the S/W Management screen, select Pedal Travel Sensor (PTS) Calibration. TSB #: 20-BR-001H Page 13 of 14 SUBJECT: SUBJECT: SONATA HEV/ PHEV & IONIQ EV/HEV/PHEV BRAKE BLEEDING 2. Read the summary of the process and click OK to continue. 3. Read the description of the process and click OK to continue. 4. Turn the ignition OFF for 10 seconds, then ON again. Click OK to complete the PTS calibration. TSB #: 20-BR-001H Page 14 of 14 SUBJECT: