Wednesday, August 15, 2018 Detailed Auto Topics
You May Also Like
AGCO Auto Quick Tip:

Try our new Category View for Detailed topics segregated by their topic.

Now it's even easier to find the information you need.

AGCO Auto Quick Tip:

You can also receive our Detailed Auto Topics, delivered to your computer, as soon as†they are written.

AGCO Automotive Detailed Topic Blog

Please click this image to subscribe.

Detailed Topics

Brake hoses are one of the most overlooked problem areas on a vehicle
While technology has transformed almost every component, the lowly brake hose remains virtually unchanged. Failure can be disastrous and inspection is not difficult.

Brake hoses are made of several layers of rubber type material and cord. Each layer may be a different material, designed to resist the elements to which it is exposed. For instance, the inner layer is exposed to brake fluid. The outer layer must resist oil, grease, ozone and abrasion. The cord, between each layer gives strength. Brake hose operate at extremely high pressure and failure of a hose, means failure of the brakes.

Inside diameter of a brake hose

Brake hoses deteriorate over time and can fail in a number of ways. The most common failure is deterioration of the outer jacket. Ozone cause the outer lining to oxidize. This can be detected by appearance. Rubbing an oxidized hose with your fingers will leave substantial black residue. When the rubber transfers to your finger tips by rubbing the hose, it is time to consider replacement.

Oxidized rubber on a brake hose leave black mark on fingers when rubbed

Small dry rot cracks, revealed by bending the hose also indicates the need for replacement. Another problem is corrosion of the mounting brackets. Corrosion in this area can "expand" and actually pinch the relatively small channel in the brake hose. A common symptom is a pull to one side when braking.†

Inspecting a brake hose.  Click image for closer view.

Sometimes an inner liner can rupture. This can be caused by pinching the hose and sometimes results from age. When the inner lining is ruptured, the high pressure can cause a bubble or bulge†in the outer lining.† A brake†hose with a bulge†can be a veritable "ticking time bomb," and may show no symptoms.

Ruptured inner lining causing a bulge in brake hose

Brake hoses normally give years of service, but should be carefully inspected at every brake service. They should also be part of the annual inspection of any vehicle five or more years old. Close inspection and timely replacement can prevent a†dangerous situation. Preventing problems, thatís the AGCO way.





Post or Read Comments (0)

Please click the link above to leave your comments

 

Registered visitors†are always invited to leave their comments and thoughts by using the form above. If you need to you can login here or register here.

You can also win a free†AGCO coffee cup, by reporting any errors you find, with†this form.