If the booster fails the test: Inspect the vacuum supply hose that goes to the booster for kinks, cracks, or damage. If you don’t see any visible issues, move on to the vacuum supply test.
If the booster fails the test: Check the power steering system to see if the problem is the pump or the booster (if you know how). Otherwise, bring your car to a mechanic to diagnose and fix the issue. [3] X Research source
If your reading is 16 or lower: Check the vacuum hose for kinks, clogs, and damage. The hose could also just be worn out and needs to be replaced, so take the car to a mechanic for evaluation. If the hose looks fine, you may have a mechanical problem like leaky valves, worn rings, an intake manifold vacuum leak, or improper cam timing.
If the hose looks fine, you may have a mechanical problem like leaky valves, worn rings, an intake manifold vacuum leak, or improper cam timing.
If you don’t hear anything when you disconnect the hose: take you car to a mechanic and have the check valve replaced. [6] X Research source You can also try blowing into the vacuum supply hose once you disconnect it. If air passes through the valve into the booster, the valve needs to be replaced. [7] X Research source The check valve is on the brake booster. Consult your car’s owner manual if you aren’t sure where to find it.
High brake pedal position Increased braking distance Activated warning lights on your dash Fluid leakage Poor engine function Failed power steering
It also depends on the make and model of your car; if you have a foreign sports car, those parts have to be ordered and tend to cost more.
Power brake booster Power brake system Brake power booster Vacuum booster
