Brake Lines - Sweating Is a Normal Condition

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Bulletin No.: 008/92
Issued: 3/30/92


Category
P

Applicable Model/s:
1991 Navajo


Subject:
SWEATING BRAKE LINES


DESCRIPTION

When servicing 1991 Navajo vehicles, you may notice that the front brake lines are wet. The wet appearance of the outer cover of rubber brake hoses is called "sweating." This condition is normal for neoprene rayon braid hose. This condition is not evidence of a brake fluid leak and will not effect braking performance.


TESTING PROCEDURE

No action is required for normal "sweating" brake lines. However, if a hydraulic fluid leak is suspected, perform the following procedure:

1. Check the brake fluid level in the master cylinder. If necessary, add fluid.

2. Wipe off the hose(s) in question with a clean cloth and an all purpose cleaner, then dry them.

3. With the engine running, fully depress the brake pedal twice and hold for two (2) minutes.

a. If the pedal goes down, check all of the connections for leaks and repair as required (see Workshop Manual, Section P).

b. If the pedal goes down and no visible leaks are seen, the master cylinder is leaking internally and must be replaced (see Workshop Manual, Section P-04).