Hydraulics are the number one fault area on British cars, primarily because moisture gets in the fluid and causes problems. The most common repair issue in the hydraulic system is leaking or seized wheel cylinders, master cylinders, and slave cylinders… but there is one issue that sometimes gets lost in the shuffle during maintenance proceedings… rubber hydraulic hoses.
This week, we had a Bugeye up on one of our lifts for a complaint of sticking rear brakes. The car would stop, but the rear brakes would stay applied even after the brake pedal returned. After a few minutes, the rear brakes would release and the cycle would repeat itself. This is a tell-tale sign that your brake hoses need to be replaced. In the below photo, you can see why:
Brake hoses are made of rubber. As with any rubber part exposed to the elements, brake hoses deteriorate over time; standard hydraulic fluid, which absorbs moisture from the atmosphere, doesn’t help matters, either. The “fun” part about brake hoses is that they are double-layer hoses, two layers of rubber bonded together. The most common failure point on hoses is not an external rupture and susequent leak; what usually happens is the two layers of rubber separate, the inner layer collapses on itself, and your brake hose turns into a one-way check valve. This allows brake pressure to travel to the brakes and applying them, but not allowing the fluid to travel away from the wheels to allow those brakes to retract. It will feel like your parking brake is stuck on, but in reality, your brake hose is holding the fluid hostage!
[Read more…] about Nick’s Tech Tips: Don’t let broken brakes leave you hosed!