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Old 02-02-2012, 09:21 PM   Thread Starter #1
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Default Knocking While Braking???

Ok...I'm stumped here...

I took my '05 to get an oil change today at Texaco Quick Lube (which is probably mistake number one, I usually do it myself but didn't have time) and as I drove out of the lot I thought I heard a slight knocking, but wasn't sure. Come to find out, there IS a knocking coming from my front passenger wheel when I LIGHTLY hit the brakes. For example, if I'm doing a good speed (30-40 mph) and hit the brakes with some force, the sound is not there. If I I'm normal driving and coming to stop, it will knock with the rotation of the tire (Steady rhythmic knock that slows as the car slows). It only does it when I'm going straight. If I turn and lightly brake....nothing. No noise at all. I've checked under the hood, under the car itself, behind the wheel, and I don't see anything loose or missing.

I don't know what they could have done to cause this just changing the oil, but it also started as SOON as I pulled out of the lot.

Completely stumped. Any help would be appreciated.

Thanks
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Old 02-04-2012, 01:43 PM   #2
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Default Re: Knocking while braking???

Sounds like a bent wheel, or maybe a bent rotor if you're slightly more lucky.
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Old 02-04-2012, 03:23 PM   #3
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Default Re: Knocking while braking???

What I would recommend is the following if you cant see anything visual...and you havent hit anything recently. Also, assuming that you are doing your oil changes you are familiar with jacking a vehicle procedures. Please, use common sense and safety. Lift the front end of the vehicle of the ground on a level surface. Make sure the vehicle is secure, by applying slight pressure to the either the fendes/ front rad support (away from you) Grab each side of the tiire (9&3 o'clock position) and wiggle it back and forth, feel for inner/outer tie rod play. Now grab at 12&6 position and wiggle tire up and down to check ball joints, or use the more often preferred method of using a brybar between the spindle and control arm on the inside of the tire....

If you came up with no play on either side. Apply emergency brakes. Get a helper wearing safety glasses,(tire might have a rock or debris flying off) to lay under the vehicle, make sure you stay clear of any rotating parts! clear of any obstructions and see if he/she can see anything while you duplicate the symptoms under which the knock is usually occuring while driving, however this time you will be doing this in mid air. ( ABS light will come on, which is normal) as the rear wheels are stopped and fronts are spinning. ABS light will automatically reset once all 4 wheel sensors send approximately the same speed signal to ABS module....

If any of this sounds too dangerous or complicated, take it to a reputable shop and they should be able to find this on the hoist within short period of time. Aprox. 1/2 hour labour time charge, at least at my shop..
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Old 02-04-2012, 04:25 PM   #4
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Default Re: Knocking While Braking???

Is it a knocking, or like a metal scrape? I had something similar to this, didn't sound dangerous or anything it turned out it was the backing plate / dust shield on the back of the rotor. I thought it was a warped rotor, which it wasn't.. but the noise it made was a horrific sounds on slow stopping. While @ mechanics I grabbed his pliers and just bent it as hard as I could in toward in the engine bay and I haven't heard the noise since.
I would think if this was a bent wheel you would feel more of a very uncomfortable thumping?

Was it doing this before the oil change? Go back to the shop and tell them to fix that shit! Lol
& deff try what ^^^^ said to check for play. If you know somebody with a lift that would be prime..
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Old 02-05-2012, 02:50 PM   #5
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Default Re: Knocking while braking???

Originally Posted by gangledupjoe View Post
Ok...I'm stumped here...

I took my '05 to get an oil change today at Texaco Quick Lube (which is probably mistake number one, I usually do it myself but didn't have time) and as I drove out of the lot I thought I heard a slight knocking, but wasn't sure. Come to find out, there IS a knocking coming from my front passenger wheel when I LIGHTLY hit the brakes. For example, if I'm doing a good speed (30-40 mph) and hit the brakes with some force, the sound is not there. If I I'm normal driving and coming to stop, it will knock with the rotation of the tire (Steady rhythmic knock that slows as the car slows). It only does it when I'm going straight. If I turn and lightly brake....nothing. No noise at all. I've checked under the hood, under the car itself, behind the wheel, and I don't see anything loose or missing.

I don't know what they could have done to cause this just changing the oil, but it also started as SOON as I pulled out of the lot.

Completely stumped. Any help would be appreciated.

Thanks
I had this exact same issue, slow steady knocking while braking. I just took the car into a Big O Tires, they pulled the wheel and found the Endlink Nut had loosed up and fallen off. The endlink was just hanging there swaying back and forth, braking caused it to know against something near the wheel until I came to a complete stop. All the momentum gone, no knocking. They put the nut back on there, problem solved.,
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Old 02-05-2012, 04:45 PM   #6
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Default Re: Knocking While Braking???

A bent wheel would cause vibration at all speeds not knocking. Im inclined to say the hub or something to do with your brakes. The fact the it happened after they did the oil change could just be a coincidence.
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