When braking, right before car stops there is a noticable knock - is it normal?

[supri]

I am new 2007 Camry LE owner and new member to this forum. I noticed when I am braking, just before the car stops there is noticable knock. My guess it is related to gear switching, but it is just a guess.

Just wondering if it is normal, or if it is not - how it can be fixed?
It becomes quite annoying.

My car has relatively low milage - 40K and mechanic did not find any major problems (but he is not sure about this knock).

Any help is greatly appreciated.

P.S. I already read the forum thread about the clunk sound when the car starts, but it is different.

[gdanaher]

I'm afraid you are going to have to proved a better description of what you are talking about. During braking, your ENGINE knocks? Or there is a thumping/knocking sound from the brakes? or you feel a downshift thump from the transmission? A single sound or repetitive? Is there a relationship to the engine rpm or not? Does it happen when the car is coasting in neutral? Get the idea?

[workerant]

a video should help... that or a mind link so we can read your mind and see and hear what you heard.

[supri]

Hi guys, thanks for your replies. Here is what I observed so far:
- I don't think there is any sound involved or it is very quite. It is more "touch" type of sensation like there is something clutching under the carpet. I think this sensation is coming through the break pedal (sorry for such bogus explanaition, but it is the best I can describe it)
- There is only one knock at about 3-5 Mph before car stops.
- Knock is not consistent. I think it is best reproducable after the car reaches at least 40 Mph.
- I tried to switch to neutral before stopping today (as per clever advise from this forum) and I never was able to reproduce the knock. Will test more tomorrow.

Thanks again,
supri

[Luna2]

Originally Posted by supri

Hi guys, thanks for your replies. Here is what I observed so far:
- I don't think there is any sound involved or it is very quite. It is more "touch" type of sensation like there is something clutching under the carpet. I think this sensation is coming through the break pedal (sorry for such bogus explanaition, but it is the best I can describe it)
- There is only one knock at about 3-5 Mph before car stops.
- Knock is not consistent. I think it is best reproducable after the car reaches at least 40 Mph.
- I tried to switch to neutral before stopping today (as per clever advise from this forum) and I never was able to reproduce the knock. Will test more tomorrow.

Thanks again,
supri

TSB "TC10-06" was applied to my 07 LE and corrected the problem with a "Thump" when braking.

Some 2006 – 2007 model year Camry vehicles equipped with the 2AZ-FE engine and U250E automatic transaxle (ATM) may exhibit a harsh 5–4 downshift under the following conditions:

ATM at normal operating temperature After driving above 45 mph (72 km/h) Decelerating through 28 mph (45 km/h)

The line pressure control solenoid assembly (SLT) has been improved to reduce this condition on customer complaint vehicles.

Mine was listed after the Production Change Effective VINs, but it was still applied, by the dealer and it corrected the problem....

"This repair is covered under the Toyota Powertrain Warranty. This warranty is in effect for 60 months or 60,000 miles, whichever occurs first, from the vehicle’s in-service date."


PM me with an email address and I will send you the PDF of the TSB....

[supri]

Hi Luna2, thanks for your hint. Will go to the dealership this week as my powertrain warranty is about to expire (or already expired). I sent you a message with my email address.

Thanks again!
supri

P.S.