Bleeding the brakes Ε koda Octavia A5 Anti-lock system (ABS) is a procedure that requires not only basic auto repair skills, but also an understanding of the features of the hydraulic circuit with an electronic control unit. Unlike classical braking systems, you can not just "push-release" the pedal: improper actions can lead to air entering the ABS hydraulic accumulator or even failure of the pressure modulator.

In this article we will look at step-by-step pumping algorithm taking into account the specifics Octavia A5 (including versions with 1.6 MPI, 1.8 TSI and 2.0 TDI), let's reveal typical mistakesEven experienced craftsmen allow, and we will give recommendations on the choice of tools. We'll pay special attention. Diagnostics of malfunctions after pumping When the pedal remains soft or ABS errors appear on the dashboard.

Why is the pumping of brakes with ABS different from the classic?

The main difference is the availability battery and electronicswhich control the distribution of brake fluid. In the system Octavia A5 ABS modulator is used Bosch 8.0 or TEVES Mk60 (depending on the year of production), which has its own hydraulic channels. If air gets into these channels, it cannot be removed by standard pumping. scanner to activate the modulator valves.

In addition, on Octavia A5 implemented diagonal:

  • πŸ”Ή Front right + rear left wheel, first circuit;
  • πŸ”Ή Front left + rear right The wheel is the second circuit.

This means that the wheels need to be pumped in a strict sequence, otherwise the air can move between the contours.

πŸ“Š What type of brake fluid do you use?
  • DOT 4
  • DOT 5.1
  • DOT 4 LV
  • I don't know

Another feature - pressure-pressure. In classical brakes, the liquid moves only due to mechanical force on the pedal, and in ABS. Octavia A5 The electric pump is responsible for this. If it is not activated during pumping, the air will remain in the pump.

Preparing for pumping: tools and materials

To work you will need:

  • πŸ”§ Scanner for ABS diagnostics (for example, VCDS, Launch X431 or Autel MaxiCOM). Without it, it is impossible to open the modulator valves;
  • πŸ› οΈ Brake pumping kit (transparent hose, liquid container, key for 8 or 10 mm);
  • 🧴 Brake fluid DOT 4 (Not less than 1 litre in volume). For Octavia A5 with 2.0 TDI recommended ATE SL.6 or Castrol React DOT4 LV;
  • πŸ”‹ Battery charger. The ABS pump consumes a lot of energy and the weak battery can run out in the process.
  • πŸ“‹ Pumping scheme (see table below).
Engine model Pumping sequence Features
1.6 MPI (2004–2013) Left front, left front, right front, left back, right front ABS modulator Bosch 8.0. The pump is activated through the scanner.
1.8 TSI / 2.0 TSI Left front, right front, right back, left front Modulator TEVES Mk60. Possible pumping without a scanner (see para. spoiler below.
2.0 TDI (CR or PD) Left front, left front, right front, left back, right front High pressure in the system. It is recommended to pre-release the pressure through the valve on the TNVD.
Upgrade without scanner for TEVES Mk60

For the TEVES Mk60 modulators (installed on the Octavia A5 since 2008), there is a manual method for activating the ABS pump:

1. Turn on the ignition (without starting the engine).

2. Press the brake pedal 10 times at intervals of 1 second.

3. Hold the pedal pressed and turn on the passing light.

4. After 5 seconds, the ABS pump is activated (hear the characteristic sound).

Attention: This method does not work on all versions of the ABS software!

Critical error: Using DOT 5 brake fluid on the Octavia A5 will cause the rubber seals in the main brake cylinder and ABS modulator to break down. Only DOT 4 or DOT 4 LV is allowed.

Step by step: pumping brakes with ABS

Before starting work necessarily Check the level of brake fluid in the tank and add to the maximum. Make sure all pumping fittings on calipers are freely unscrewed (treat them if necessary). WD-40 1-2 hours before the start.

Wear protective gloves and glasses | Turn off ESP (button on the panel) | Check the tightness of the hoses | Make sure there are no leaks of liquid | Connect the charger to the battery-->

Step 1: Upgrade the rear wheels

Start with right rear wheel (for 1.6 MPI and 2.0 TDI) or left-handed (for 1.8/2.0 TSI):

  1. Put the hose on the pumping fitting and lower the second end into the container with liquid;
  2. Unscrew the fitting by 1/2 rotation;
  3. Ask the assistant to press the brake pedal to the end and hold it.
  4. Turn the screw and release the pedal. Repeat 3-4 times until the bubbles stop coming out.
  5. For ABS: connect the scanner and activate the pump (in the VCDS select 03-Brake Electronics β†’ Basic Settings β†’ Group 001).

Step 2: Upgrade the front wheels

Move to the front-wheeland the consistency of your model (see para. (a) the table above. It's important here:

  • πŸ”§ Use socket wrench for the snails, so as not to tear the edges;
  • πŸ’§ Monitor the level of liquid in the tank - it should not fall below the minimum;
  • ⚑ After pumping each wheel, turn on the ignition for 10 seconds to relieve pressure in the pump.
πŸ’‘

If after pumping the pedal remains soft, check the condition. vacuum brake booster. On the Octavia A5, its aperture often cracks, leading to air suction.

Step 3: Pumping the ABS modulator

This is the hardest part. For Bosch 8.0 and TEVES Mk60 the algorithm is different:

For Bosch 8.0:

  1. Connect your scanner and select a function Bleed ABS;
  2. Follow the instructions of the program (usually you need to press the brake pedal on command);
  3. After completion, check for no errors in the ABS block.

For TEVES Mk60:

  1. Activate the pump through the scanner (Actuator Test β†’ Pump Motor);
  2. Open all the pumping connections on the modulator (located on the ABS block);
  3. Wait until the liquid goes without bubbles (about 2-3 minutes).

πŸ’‘

If after pumping the ABS modulator on the dashboard an error burns, reset the adaptations through the scanner (Basic Settings β†’ Channel 001).

Common mistakes and how to avoid them

Even experienced masters make mistakes when pumping brakes with ABS. Here are the most common:

  • ❌ Pumping without activation of the ABS pump. The air remains in the accumulator, and the pedal remains soft;
  • ❌ Using the wrong liquid. DOT 5 or DOT 3 will break the seals.
  • ❌ Lack of consistency. For example, pumping the front wheels to the rear will lead to cross-contamination of the contours;
  • ❌ Forget to put pressure in the accumulator after pumping (on 2.0 TDI this is critical!).
⚠️ Attention: If after pumping the brake pedal "fails" at the first press, but then pumped - this is a sign of the scaling of the brake pedal. faulty ABS hydro-battery. It needs to be replaced, as the pumping here will not help.

Another common problem is error 01044 (Control Module Incorrectly Coded) after pumping. This occurs if the scanner has misreset the adaptation. Decision:

  1. Connect your scanner and select 03-Brake Electronics β†’ Coding;
  2. Enter the original code for your model (can be found by VIN in the database) ETKA);
  3. Execute Basic Settings β†’ Channel 060 to reset.

Diagnosis after pumping: what to check?

After completion of the work, it is necessary to:

  1. Check the brake pedal.:
    • πŸ”˜ It should be elastic and not "fall down";
    • πŸ”˜ Pedal movement - no more than 1/3 of the total;
    • πŸ”˜ When holding the pedal, the force should not fall.
  2. Test the ABS:
    • πŸš— Accelerate to 40 km / h and brake sharply. The vibration of the pedal should be felt.
    • πŸ”§ Check for no errors in the ABS block through the scanner.
  3. Check the system for leaks:
    • πŸ’§ Check the pumping fittings, hoses and main brake cylinder;
    • πŸ” Pay special attention tube connections with ABS modulator - they're often oxidized.

If the brakes are "cotton" even after proper pumping, the reasons may be as follows:

  • πŸ”΄ Worn brake pads or discs (especially relevant for Octavia A5 mileage of more than 150,000. km);
  • πŸ”΄ Stifling of vacuum amplifier (check the hose from the intake manifold);
  • πŸ”΄ Master cylinder malfunction (A sign of leakage of liquid under the pedal).
⚠️ Attention: On Octavia A5 with 2.0 TDI (especially with the system DSG) there may be an error after the brakes have been pumped. P1753 (pressure in the hydraulic system). This is because the ABS unit and gearbox use a common hydraulic main. Solution: Reset the box adaptation through the scanner (see below).19-CAN Gateway β†’ Adaptations).

Frequent questions about pumping the brakes Octavia A5

Can I pump the brakes on the Octavia A5 without a scanner?

Theoretically yes, but only for models with TEVES Mk60 (see para. spoiler above. For Bosch 8.0 The scanner is mandatory, since without activation of the modulator valves, air from the accumulator will not be removed. The alternative is β€œswifting” (opening all the connections for 1-2 hours), but this takes a lot of time and does not guarantee the result.

How often do you need to change brake fluid on an Octavia A5?

The manufacturer recommends replacement every 2 years or 60 thousand km. However, for regions with high humidity (for example, St. Petersburg, Sochi) the interval is better to reduce to 1 yearSince the liquid actively absorbs moisture, which reduces the boiling point. Nana 2.0 TDI with the system DSG fluid should be changed every time 40 thousand km due to increased pressure on the hydraulics.

Why does the ABS light bulb burn after pumping?

There are several reasons:

  1. Adaptations in the ABS block are not reset (you need to do it through the scanner);
  2. ABS sensor on one of the wheels is damaged (check the resistance with a multimeter - it should be 800-1400 Ohms);
  3. The modulator got air (requires a re-pumping with the activation of the pump).

On Octavia A5 with Haldex (all-wheel drive) ABS light bulb may light up due to clutch fault - check for errors in the unit 22-AWD.

What brake fluid should I fill in the Octavia A5?

Official recommendations:

  • πŸ”Ή DOT 4 - for all petrol models (1.6 MPI, 1.8 TSI);
  • πŸ”Ή DOT 4 LV (Low Viscosity) 2.0 TDI and versions from DSG;
  • πŸ”Ή DOT 5.1 It is allowed, but not recommended due to hygroscopicity.
Prohibited mix liquids of different classes (for example, DOT 4 and DOT 5.1)!

What to do if the bleeder fitting is broken?

If the squirrel or the squirrel breaks, act as follows:

  1. Take off the caliper and squeeze it into the vise;
  2. Heat the area of the fitting with a building hair dryer (temperature ~200 Β° C);
  3. Use plug-in (for example, Lisle 25800);
  4. If the fitting is turned - you will need to replace the caliper or brake cylinder.

On Octavia A5 Original Pumping Stitches Have Articularity 1K0 615 121 (for the front) and 1K0 615 451 (for the rear ones).