Brake Bleeding Technique

1964-2010 Mustangs


  Brake Bleeding Directions by Baer Brakes

It is a common misconception that bleeding the brakes is done with pressure, the more the better. In fact, if you were taught the two-man process there is a strong chance you're under the impression that bleeding is actually a contest to see how far you can shoot the fluid out of the caliper! Nothing could be further from the truth. A gentle stroke and firm but light pressure does the trick every time. The key is to gently but firmly move the fluid through the system while displacing the air trapped in it.

Here is what you will need: a properly sized box wrench and a clear plastic bleed hose are essential. Good quality, non-silicone fluid is also a must. In addition, you'll need to enlist the help of a coworker or friend. Though you may have purchased a brake bleeding tool, either vacuum or pressure, and are satisfied with your results, approaching this task as a two-person operation will achieve the best results.

1. Slowly pour fluid into the master cylinder so as not to aerate the fluid.
2. Next, move to the caliper farthest from the master cylinder and attach the clear plastic bleed hose to the bleeder and open it. VERY SLOWLY stroke the brake pedal by hand or foot until fluid comes out. Now close the bleeder.
  a. Have your partner very slowly, with modest pressure (approximately 25-30 ft./lbs.), stroke the pedal one time until hydraulic resistance is encountered. Ask your partner to hold at this point with the same modest and even pressure and notify you that he is "holding."
  b. Open the bleeder, letting the pedal go to the floor or until it stops using the same modest level of pressure, then close the bleeder again. Notify your partner "the system is sealed."
4. Repeat the bleeding sequence (never stroke the pedal more than one time) until all signs of air are purged (no bubbles) from the fluid. DO NOT LET THE MASTER CYLINDER RUN DRY. Check the fluid level every third bleeding sequence or sooner, depending on the size of the reservoir.
5. Before moving to the next caliper, take a small block of wood or a plastic hammer and carefully tap the calipers to dislodge any additional air bubbles that may be trapped. Then bleed one last time.
6. Move to the location that is the next furthest from the master cylinder and repeat the above process. Continue until all calipers have been bled.

Before re-installing the wheels, we recommend that all surfaces are wiped clean-including calipers, hose joints, fittings, and rotors-to make sure they are dry and free from seepage, dirt and oils.

According to Baer, bleeding the brakes is one of the most important tasks you can perform on a vehicle. The above technique will get the job done in the most straightforward and thorough fashion possible.

Back to the Tech Articles

* Please be advised that this information is for suggestion only and is based on prior experience. We at CJ Pony Parts can not be held responsible or liable for any mistakes or injuries connected with the topics covered.