Eezi-Bleed Pressure System
914 Brake Fluid Reservoir
|| The first step in bleeding the 914
brakes is to fill the system with brake fluid. Some people have suggested that
colored brake fluid be used in order to determine when fresh fluid has been flushed
through the entire system. I used a pressure bleeder like the Eezi-Bleed System
shown in Figure 2. The system works by
pressurizing a bottle filled with brake fluid from air in the spare tire. Inflate
your tire to 20 psi, fill the bottle, attach it to the top of the reservoir (Figure 3), and then connect it to the spare tire.
This will pressurize the system. Note: brake fluid is highly corrosive and
will mar paint very easily. Bleeding your brakes is a messy job; keep yourself away
from the paint and don't bleed the system in tight garage. The probability of
spilling on yourself and then leaning against your car is too great.
Now start bleeding the system. Start with the right rear caliper, the one that's
located furthest away from the master cylinder. You will have to remove the rear
wheels of the car to easily get to the rear caliper. The front wheels can be turned
for access to the calipers. Bleed the right rear caliper by attaching a hose to the
bleed nipple, placing it in a jar, and then opening the valve with a 7mm wrench. A
bleeder nipple is shown in Figure 4, and can
be opened by turning it counter clockwise. Let the fluid out until there are no more
bubbles. If you don't have a pressure bleeder system, you need to find someone to
press on the pedal repeatedly to force fluid through the system. Another solution is
to get a check valve and place it on the nipple while you stomp on the pedal. This
will work for getting fluid into the system but you will still need a second person to
make sure you have bleed the proportioning valve properly. If your rear caliper has
two bleed nipples (some have one, others have two), bleed the lower one first.
When no more air bubbles come out, then move to the next
caliper. Bleed them in this order:
- Right Rear Caliper
- Left Rear Caliper
- Right Front Caliper
- Left Front Caliper
Repeat until you can no longer see any air bubbles coming out of
any of the calipers. Make sure that you don't run out of brake fluid in your
reservoir, or you will have to start over again. It is wise to start with about a
gallon of brake fluid. Depending upon your car, and the mistakes you may make, it's
wise to have an ample supply.
Now, make sure that all the bleeder valves are closed
tightly. Disconnect the pressure system from the reservoir. Now, get your
family member to press down repeatedly on the brake pedal at least five times, and then
hold it down. Then open the bleeder valve on the right rear caliper. The
system should lose pressure, and the pedal should sink to the floor. When the fluid
stops coming out of the bleeder valve, close the valve, and then tell your family member
to let their foot off of the pedal. Do not let them take their foot off until you
have completely closed the valve. Repeat this motion for each valve at least three
times. Repeat this entire procedure for all the valves in the same order as
Then, let the car sit for about 10 minutes. Repeat
the bleeding process at each corner. The pedal should now feel pretty stiff.
If the pedal still feels spongy, make sure that you have
the proper clearances on your rear calipers. For more information on adjusting the
rear calipers, please see the Pelican Technical Article, Replacing and Adjusting 914 Brake Pads.
Also, you may need a new master cylinder, have a leaky caliper, or have old spongy
flexible brake lines.
If the pedal still feels spongy, Jim Pasha has another
method that I will describe here. He recommends having your family member step down
on the pedal repeatedly and then hold it down, while you crack open the inlet line from
the master cylinder. The inlet line is the one that comes out from the firewall of
the car. Wait until fluid stops, tighten the connection, and then have your family
member let their foot off of the pedal. Then, repeat the procedure for the outlet
line on the proportioning valve. He suggests that this will alleviate air pockets in
the internals of the valve. Be sure to wear eye protection and wrap the
proportioning valve with a rag so that brake fluid doesn't squirt everywhere. Be
sure to rinse off brake fluid that has spilled on painted surfaces with water.
Wiping it will only smear the paint more (I talk from experience here).
Well that's about all it takes. If you would like
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