Rick's Free Auto Repair Advice

Posts Tagged: brakes hard to push

P0171 Hard brake pedal

Fix Hard brake pedal – P0171 Hard brake pedal on 2005 Ford F-150 pickup with the 5.4-litre engine, no power brakes, P0171 P0171 System too Lean (Bank 1). This vehicle is with vacuum assist power brakes. The power assist is provided by a vacuum booster. The booster is a dual chamber unit with a rubber diaphragm separating the two chambers. When the engine is running, engine vacuum is applied to both chambers. Then, when you press on the brake pedal, a valve allows atmospheric pressure into one chamber. With atmospheric … Read More

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