Problem: Internal brake hose damage during inspection or service
Cause 1: use of non-approved hose clamping device such as vise grips (See Figure 58.1) Vise grips or similar tools can permanently damage the internal structure of even a new brake hose.
Figure 58.1 Figure 58.2
Cause 2: Hanging caliper by brake hose during inspection or service as shown in Figure 58.2. Hanging a caliper by the brake hose puts undue stress on the internal structure of the brake hose and can cause permanent damage. Some light truck caliper weight as much as 18lbs. Calipers should be supported during service as shown in Figure 58.3.
Cause 1 Solution:
Use an alternate method for preventing fluid loss during service such as:
- Use a tire valve stem to plug the brake hose at the banjo bolt opening.
- Change the caliper only when the replacement part is available to prevent excessive fluid loss.
Cause 2 Solution:
Support caliper during inspection and service using pipe hook or other suitable tool. do not rest caliper on suspension or frame as it will probably fall off and could create even ore damage to the hose.
More Info: The brake hose is made up of a series of layers of rubber and a woven fabric. These layers give the hose the ability to withstand high pressures and prevent leaking. Failure to properly handle the brake hoses during inspection or service can result in ether a restricted brake hose or a one way check-valve condition.