Normally you don’t need to bleed the brakes after simply replacing the brake pads or shoes. The exception is if while changing the brakes somehow you let air into the brake lines (like if the brake hose detaches from the brake assembly) – in that case you would need to bleed them. Many people also suggest that you should periodically (once every few years) bleed your brakes to help get new, clean fluid into the system.
Let me preface this post by saying that I have bled the brakes on my 1998 Nissan Maxima (now deceased due to a falling tree), but I have not yet bled the brakes on my 2001 Toyota 4Runner during the two years that I’ve had it. Nevertheless, the instructions below are specific to the 4Runner because someone emailed me recently asking for instructions on how to do this.
I think the best way to bleed your brakes is how the Toyota repair manual describes it. Note that the following are taken directly from the repair manual, so if you run into problems let me know and I’ll add your tips and observations to this write-up.
Setting Things Up
See in the first picture below how they attach vinyl tubing from the bleeder plug into a container that will catch the brake fluid that will be expelled from the system. Make sure that the tube goes to the bottom of the container – that way it will be immersed in the brake fluid and you won’t accidentally get air pulled back into the brake lines. You bleed one brake at a time, so you only need one container to do this.
Now look at the following three pictures to see where the bleeder plugs are on the front and rear brakes.
Location of Front Brake Plug
Location of Rear Brake Plug
Brake Bleeding Instructions
Now that you see where things are located, follow the steps that Toyota gives (with my own comments added in parentheses):
Bleed Brake Line
- Connect the vinyl tube to the brake caliper. (They’re talking about the bleeder plug – and remove the cap from the plug first.)
- Depress the brake pedal several times, then loosen the bleeder plug with the pedal held down. (This is where it’s handy to have your buddy help out – one person to do the brake pedal and the other person to loosen and tighten the plug.)
- At the point when fluid stops coming out, tighten the bleeder plug, then release the brake pedal. (Note the order – tighten the plug before having your friend release the brake pedal. Also make sure that you have plenty of brake fluid in the reservoir under the hood before doing this so that you don’t make it go empty which will cause a lot of extra work and headache.)
- Repeat (2) and (3) until all the air in the fluid has been bled out. (Once again, each time make sure that there is enough fluid in the reservoir before each repetition).
- Repeat the above procedure to bleed the brake line for each wheel.
After you’re done you need to check the fluid in the reservoir. Once again, follow Toyota’s instructions:
Check Fluid Level in Reservoir
- With the ignition switch OFF, depress the brake pedal more than 40 times.
- HINT: When a pressure in power supply system is released, reaction force become heave and stroke becomes shorter. (They’re just saying that each time you press the brake pedal it will get more and more difficult to depress it.)
- Remove the reservoir cap. Add brake fluid up to the “MAX” line.
Like I mentioned before, let me know if this works well for you or if you run into any hiccups. If it worked out OK then I’ll take some better pictures, describe it better, and put the write-up on my blog.