Brake Hose Problems
Internal brake hose damage during inspection or service
Brake Hose Problem 1:
Use of non-approved hose clamping devices such as vise grips (See Figure 58.1) Vise grips or similar tools can permanently damage the internal structure of even a new hose.
Brake Hose Problem 2:
Hanging caliper by the hose during inspection or service as shown in Figure 58.2. Hanging a caliper by the hose puts undue stress on the internal structure of the hose and can cause permanent damage. Some light truck calipers weigh as much as 18lbs. Calipers should be supported during service, as shown in Figure 58.3.
Cause Solution 1:
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 another suitable tool. Do not rest the caliper on suspension or frame as it will probably fall off and could create even more 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 hoses during inspection or service can result in ether a restricted hose or a one way check-valve condition.
Are you looking to learn more mechanical tips and tricks? Please join our Facebook group “Mechanic Mafia.” The group is a great place for mechanics from all backgrounds to interact, learn and share experiences. Otherwise, feel free to check out some of our other articles by selecting the button below:
I still remember the first time that, out of curiosity, I cut an old brake line and discovered how small the fluid passage was. And “passage” is probably not the right word since, once the line is filled, brake fluid in disk systems hardly “passes” anywhere. It mostly just pressurizes and depressurizes.
All the best.