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BRAKE BLEEDING INSTRUCTIONS CONT.
5. Replace the plug tightly, move to the second outlet port and repeat the steps for the
second circuit. Be sure to replace the plugs tightly because hydraulic pressure will be
applied in the next step.
6. Now adjust the master cylinder in a vise with the push rod end down slightly. Slowly
push the master cylinder push rod in about a 1⁄8", release it should return to its original
position. Repeat this several times until no air bubbles can be seen in the reservoirs. If
you master cylinder doesn't have a push rod use a rounded piece of wood, or
something that won't harm the push rod seat. Slotted and Philips screwdrivers seem
ideal, but can damage the seat or the rear seal.
7. Remount the master cylinder with the push rod end up slightly and repeat the bleeding
steps from above one more time. Plug both outlet ports tightly.
8. The master cylinder is now free of air and ready to install.
ANTI-LOCK BRAKE
Many newer vehicles are equipped with an Anti-Lock Brake System. Some of those could
include the use of a high pressure pump to keep the system pressurizes. Special
procedures are needed when servicing. Consult your service manual for those procedures.
Observe the following precautions when servicing Anti-Lock brake system:
• ALWAYS wear safety goggles when servicing high pressure brake systems.
• ALWAYS depressurize the ABS system prior to servicing, making repairs or adding fluid.
• NEVER loosen a hydraulic line or open a bleeder fitting while the ABS system is
pressurized.
• NEVER use silicone brake fluid in ABS equipped vehicles. Consult service manual for
brake fluids type.
• ALWAYS reference the manufacturer's service manual for information on Anti-Lock
brake systems.
DEPRESSURIZING ANTI-LOCK BRAKE SYSTEMS
This procedure works on most Pressurized Anti-Lock brake systems. Always refer to the
appropriate service manual for manufacturer's information on depressurizing procedure.
Ignition switch has been turned off, and the negative battery clamp has been disconnected.
1. First pump the brake pedal until a change in the peddle pressure is felt. This takes 25
or more pumps before a noticeable change is felt.
2. Pump the pedal a few more times, this will remove most system pressure.
3. Open the fluid reservoir or loosen brake lines, but still use caution. Leave the reservoir
off if you intend to change the brake pads prior to bleeding the brakes.
4. Top off the brake fluid with whats recommended for your vehicle.
5. Reconnect negative battery clamp when finished.
BLEEDING ANTI-LOCK BRAKE SYSTEMS
Bleeding the brakes after brake any components have been replaced is a step you don't
want to skip. Air trapped in the lines, calipers or wheel cylinders will make the pedal feel
soft and spongy. Air is compressible, so any air bubbles in the system will get compressed
first. Then as you continue to apply the brakes, the hydraulic fluid transmits pressure to
apply the brakes. Typically the front brakes on most Anti-Lock brake systems can be bled in
the usual manner. Some automotive manufacturers use bleeding procedures which require
specialized equipment. Always reference the manufacturer's service manual for the proper
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