Brake Hydraulic System; Brake Fluid - Jeep 1979 CJ-5 Technical & Service Manual

Table of Contents

Hydraulic System Inspection

Master Cylinder

Specifications

Wheel Cylinder

The brake hydraulic system consists of the dual reser-

voir master cylinder, combination valve, front disc

brake calipers, rear drum brake wheel cylinders, and the

connecting brake lines, hoses, and fittings (fig. 2G-8).

The hydraulic system is a closed system and must

remain free of contaminants in order to function prop-

erly. When servicing the system, prevent the entry of

contaminants by capping all lines and ports, and by

avoiding the use of cleaning solvents that have a mineral

CAUTION: Never use gasoline, kerosene, carbon tet-

rachloride, paint thinner, alcohol, or any similar fluid

containing mineral oil, to clean or lubricate

system components. These materials will cause swell-

ing, deterioration, and premature aging of rubber parts.

Use brake fluid or brake cleaning solvent only.

To determine if dirt, moisture, or mineral oil base

fluids have contaminated the hydraulic fluid, drain off a

sample and check for suspended particles, discoloration,

or separation of the fluid into distinct layers. Layering

indicates the presence of water or mineral oil. If system

contamination should occur, drain and flush the entire

brake hydraulic system with an approved brake fluid

l U I I F L U .,

When refilling or adding brake fluid to the hydraulic

Fig. 2G-8 Brake Hydraulic System (Typical)

H Y D R A U L I C S Y S T E M

Brake Bleeding

Brake Fluid Level 2G-21

Combination Valve

Troubleshooting