Figure 4-31. Master Cylinder Cross Section

Figure 4-31. Master Cylinder Cross Section

Make certain that pressure bleeder tank is

certified for use under pressures exceeding

30 psi before using.

4 - 1 9 . BLEEDING BRAKE SYSTEM. Whenever

the brake system is opened for any reason, such as

a. Clean all dirt, grease, etc., from around the

repairs to master cylinder, wheel cylinder, valves or

master cylinder reservoir cap on both the brake

tubing, air will enter the brake system and must be

and inching master cylinder.

expelled through the bleeding procedure outlined

in the following paragraphs. Pressure bleeding, as

outlined in paragraph 4-20, is the preferred method

b. Remove the master cylinder reservoir cap and

if the proper equipment is available.

fill reservoir with SAE 70 R3 Heavy Duty

Hydraulic Brake Fluid to within l/4 inch from the

4-20. PRESSURE BLEEDING. Make certain that

top of the reservoir.

the pressure bleeding equipment will hold enough

of the right type of brake fluid to do the job

c. Fill the pressure bleeder reservoir with about 2

(about 2 quarts). Do not intermix different types

of brake fluid, and never reuse fluid that has been

quarts of the same fluid, and pressurize the tank to

drained from the brake system.

not more than 30 psi.

4-22