BLEEDING BRAKES

[Fernando Mendes]

joel gopan » Sun Aug 28, 2005 9:47 am
Bleeding Boosted Brake Systems as the Army taught me.


1. Fill the master Cylinder, and keep it full

2. Bleed the Booster (Hydrovac in your case) first

3.Start at the extreme rear Axle and work toward the front axle, (RH or LH first is not important)

4. Finish by bleeding the Booster again,as this will give you the optimum effect in bleeding.

It is not necessary to monkey with draining the opening for the stop light switch, or remove the various plugs at the front of the CCKW Master Cylinder. It helps to have an assistant that is 100% aware of the need to coordinate "pumping" and "holding" with the guy with the bleeder wrench. The truck need not be running. I have a professional pressure bleeder that I connect to the master cylinder , and the process can take as little as 10 minutes. It also helps to adjust your brakes. If this does not work, it is advised to pull all six wheels and service the wheel cylinders.

Do not be tempted to start playing with the adjustment at the rear of the Master Cylinder, one must assume that the brakes were previously up to spec. It is realistic to realize that time has taken a toll on your brake components, as parts do go bad.
Joel

[Fernando Mendes]

joel gopan » Sun Aug 28, 2005 5:42 pm
You will see two brake bleeder fittings on the outlet end of the Hydrovac, do the upper one farthest from end first, your on line manual illustrates the procedure, but always do the Hydrovac a second time.
Joel

[Fernando Mendes]

Who is the first? To me the sequence in hydrovac is:1)valve bleeding screw,2)slaving cylinder bleeding screw.