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BRAKE BLEEDING INSTRUCTIONS CONT.
brake bleeding procedure. If the only components you replaced were downstream of the
ABS modulator, chances are normal bleeding procedures will clear the lines of any
unwanted air. Components such as the calipers, wheel cylinders, brake hoses or lines,
these are downstream. The most common bleeding procedure is to bleed the brake furthest
from the master cylinder first, passenger rear. Then follow the brake line to the other brake
that shares the same brake circuit. Typically it's the rear brake on the driver's side of most
cars and trucks. Sometimes it's the opposite front brake on a front wheel drive car or
minivan.
Always refer to the vehicle manufacturer's recommended bleeding sequence as this may
vary from one application to another depending on how the system is configured. Then
bleed the other brake circuit starting with the furthest brake from the master cylinder. If the
repair involves replacing the master cylinder, a brake line or valve ahead of the ABS
modulator. Or, if replacement of the modulator or high pressure accumulator was needed.
This is where the vehicles service manual becomes a necessity. Some ABS modulators
have special bleeder screws to help vent the air when bleeding the system. Others don't
and require an OBDII scan tool to cycle the ABS solenoids while you bleed the system.
BRAKE LINE BLEEDING
Most low and soft pedal problems are caused by air in the hydraulic lines, wheel cylinders
and calipers. The solution requires bleeding of the hydraulic brake system. By using the
pump with brake bleeding accessories, the system can be bled easily in a short period of
time. The vacuum pump kit provides a simple, clean, and quick method for bleeding the
fluid lines in the automotive brake system.
The order on most cars is starting with the passenger rear brake first, then driver rear, then
passenger front and finishing with the driver front. All bleeding fittings must be clean prior to
beginning the bleeding procedure. Dirt or contaminates can enter an open bleeder valve.
Be sure to check the brake fluid level in the master cylinder after bleeding each brake.
Don't let fluid drop below the indicator line inside the reservoir. The vacuum pump creates a
vacuum as you pump the handle, causing fluid to be drawn into the reservoir. Tiny bubbles
may form in the hose after the air is bled from the lines. This air is seeping around the
threads of the loosened bleeder fitting as you pump the trigger of the vacuum pump. Fill the
master cylinder reservoir with new, clean brake fluid. Be sure to have plenty of the proper
DOT type for your vehicle handy. Keep the lid on, but close by to top off the reservoir after
bleeding each wheel.
NOTE: Follow manufacturer's recommended bleeding sequence (if known). Begin at the
corner furthest from the driver and proceed in order toward the driver. (Right rear, left rear,
right front, left front.) While the actual sequence is not critical to the bleed performance it is
easy to remember the sequence as the farthest to the closest.
VEHICLE BLEEDING PROCEDURE
1. Find the wrench that fits your bleeder fitting on the caliper. Longer box end wrenches
work best for this. They help prevent stripping of snapping off the fitting. See
Performance Tools W80616, W80617, W80619, or W80620.
2. Place the wrench on the brake bleeding fitting. Select and press the adapter over the
top of the fitting.
3. Pump the handle several times, open fitting slightly watching for clean brake fluid and
fewer bubbles. It only takes about a 1/4 turn for fluid to flow into the jar. The vacuum
created should draw brake fluid as soon as the bleeder valve is opened. If it's not,
make certain the lid of the jar is tight. Vacuum cannot build if the lid was not replaced
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