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Alison

Knocking when accelerating, stops when brake pedal is touched

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I have a 2015 Escape SE.  In February this year it started making a growling noise and my mechanic changed 2 press type bearings on the rear wheels. Immediately afterwards it started making an intermittent knocking sound when accelerating. As soon as I touched the brake pedal (not even applying pressure) the knocking stopped. I took it back to the mechanic and he drove it and couldn't hear it because it's intermittent and comes and goes at different times. He checked the car over and declared he could find nothing wrong. The knocking persists intermittently. Some days it happens, some days it does not. Can be at low speeds or high speeds. Only happens when driving straight, not when turning. I can make it stop by just touching the brake pedal, not even applying pressure. It can go a few days without knocking, or it can happen every day.

Six weeks ago I had the winter tires taken off and summer ones put on by my mechanic, and the steering started pulling to the left and right, so I took it to a Ford dealer to get a wheel alignment ( I didn't mention the knocking sound). They did the alignment and rotated the wheels and miraculously the knocking stopped. Last week I returned to my mechanic to get new shocks on the rear and he also did a new press type bearing on one front (waiting for the other front to be done this week), and the knocking immediately started again. 

By my deductions, my mechanic did something to cause the knocking when he replaced the rear bearings in February. It was alleviated when the wheels were rotated six weeks ago, and it came back when my mechanic put on new shocks and a new bearing on the front last week. My mechanic is a great guy and has worked on my cars for 14 years, always ready to help and be of service. He can't figure it out and I am at my wits end. It's a loud knock, and seems to correlate to the wheels turning because as I speed up the knock gets faster and as I slow down the knock gets slower. Touching the brakes without applying pressure immediately stops the knock. Doesn't happen every time I drive it. Can be at any speed.

Is there anybody here who can offer any advice? I want it to stop, and it could be dangerous.

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