How To Bleed Brakes on a Hybrid Vehicle Part 2

How To Bleed Brakes on a Hybrid Vehicle Part 2

This is part 2 of our Tech Tricks Tuesday on how to bleed brakes on a hybrid vehicle. If you missed last week's post, you can read it here.

Last week we covered:
  • The history of the Prius used in this write-up
  • Where the master cylinder reservoir is and how to remove the cap
  • The importance of the master cylinder cap
  • A brief overview of the brake system
This week we will cover:
  • How to properly prime the reverse brake bleeding tool
  • How to get started with reverse bleeding on the hybrid vehicle
  • How to proceed with bleeding the system
Hybrid Bleed 10 How to Bleed a Hybrid Step 10


Step 10

Fill the bleeder bottle from a clean unopened container of the correct type of brake fluid. In this case the vehicle specified DOT 3.

Hybrid Bleed 11 How to Bleed a Hybrid Step 11


Step 11

Next, put the cap containing the pickup tube onto the bottle.

Hybrid Bleed 12 How to Bleed a Hybrid Step 12


Step 12

After tightening the cap, install the return line onto the open cap connection.

Hybrid Bleed 13 How to Bleed a Hybrid Step 13


Step 13

Next, prime the hoses by pumping the bleeder handle until you have a solid stream of fluid flowing.

Hybrid Bleed 14 How to Bleed a Hybrid Step 14


Step 14

After filling the hose with fluid, attach a bleeder valve end to the hose.

Hybrid Bleed 15 How to Bleed a Hybrid Step 15


Step 15

With the bleeder ready to go, loosen the bleeder valve on the first component in the bleed sequence.

Hybrid Bleed 16 How to Bleed a Hybrid Step 16


Step 16

Squeeze the handle of the bleeder slightly to be sure the hose and bleeder end is full of fluid then place your finger over the bleeder end.

Hybrid Bleed 17 How to Bleed a Hybrid Step 17


Step 17

Place the bleeder valve end of the hose over the bleeder valve, which has been opened and will allow fluid to flow through it.

Hybrid Bleed 18 How to Bleed a Hybrid Step 18


Step 18

Pump the handle of the bleeder which forces fluid from the filled bottle through the bleeder and into the hydraulic circuit for this specific wheel.

Hybrid Bleed 19 How to Bleed a Hybrid Step 19


Step 19

After bleeding the first wheel in the bleed sequence, the fluid level in the master cylinder reservoir was checked and it was noted that the level was increased from when starting the bleeding. This was proof positive that the fluid was flowing upstream through the system.

Hybrid Bleed 20 How to Bleed a Hybrid Step 20


Step 20

The remaining wheels were then bleed flowing the bleed sequence stated in specifications. On the drum brake rear wheels the wheel cylinder bleeder valve was opened and the same procedure as on the front was applied.

Hybrid Bleed 21 How to Bleed a Hybrid Step 21


Step 21

After tightening the bleeder valve, the rubber cap was reinstalled. This is important as it prevents moisture from entering the center of the bleed valve and corroding the seat area of the bleeder valve.

This covers this week's post. Come back next week to discover how to finish up with the bleeding of the hybrid vehicle.
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