Question about Toyota RAV4
I have an automatic 2008 Rav4. Lately when I brake I hear a knocking sound. At first we thought it. Was the brake pads but having those checked I was told it wasn't. Another guy thought it might be the gearbox oil and filter needed changing but I don't have a problem whatsoever with the gears or driving it. It's perfect other the this knocking sound once I hit the brakes. Any idea what this could be? Thanks.
The noise will be in the brake disc rotors and could be the inside face cracked . Have a brake specialist shop do the check as the knocking noise under brakes will have nothing to do with a transmission.
Posted on Mar 25, 2014
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
SOURCE: Automatic gearbox
How to prevent the transmission from damage
(The filter usually is screen type and can be cleaned when remove bottom cover. but this is not to be done at regular maintenance inspection.)
- Regularly check your parking space for leaks. Doesn't matter, is it the engine oil leak, power steering fluid or transmission fluid; if you discover any, get it fixed before it caused something serious.
- Once in a while check the transmission fluid level and condition. Not all cars however have the automatic transmission dipstick, in some cars, for example, in late Volkswagen models, the transmission fluid can only be checked by the dealer. Consult with your owner's manual for details. If the transmission fluid level is too low, there is a leak somewhere that needs to be fixed.
- Change the fluid as often as it said in your owner's manual or when it becomes too dark (rather brown than red) or dirty.
Also, keep in mind that an automatic transmission can not be drained completely - there is always some transmission fluid left inside the transmission (the torque converter, in the valve body, etc.) which means you only can change about %60 of the fluid at once. This is one more reason to change it more often.
- Use only the same type of the transmission fluid as specified in the owner's manual or on the dipstick. Some vehicles (e.g Dodge Caravan) are very sensitive to fluid type
- Never shift to the Reverse or Parking until the car comes to a complete stop.
- Never shift from the Parking mode when engine rpm is higher than normal idle.
- Always hold a brakes down when shifting from Parking.
- The automatic transmission can be damaged if towing with the drive wheels on the road. Always use a dolly or place powered wheels on the towing platform (if the vehicle is front wheel drive - tow it from the front leaving rear wheels on the road.
Posted on Jun 12, 2008
SOURCE: KNOCKING SOUND WHILE BRAKING
The key sentence is "KNOCKING OCCURS WHEN BRAKING AT ANY SPEED." With out being able to test drive the car I would have to say from experience it is the ROTOR. The rotor had a bump or a high spot on it. The rotor suppose to worn evenly but for some reason you did not.
The solution is you have to take the rotor out and have it machine flat.
Some time it can be machine and sometime it has to be replace.
You have to replace both rotors at the same time not one.
This is because both has to have equal size.
I do hope this help you.
Posted on Mar 14, 2009
See if you can bounce car and replicate the noise. If you can, you should be able to find it, and put your hand on it. Stabilizer bushing are a place to look, both at the lower a arm and on the frame. If you narrow it down to the strut, it will need to be replaced. The front trans mount also goes bad, try putting it in drive with your foot on the brake and give it some gas and see if the engine moves an excessive amount.
Posted on Nov 23, 2009
Tips for a great answer:
Sep 24, 2015 | Honda Cars & Trucks
Dec 11, 2013 | Cars & Trucks
Nov 30, 2013 | Hyundai Sonata Cars & Trucks
Oct 22, 2013 | Cars & Trucks
Jan 28, 2013 | Cars & Trucks
are many possibilities that can cause car to make noise.
actually from where the noise is coming from. Front end or rear end. From
engine area or from inside the steering or from brakes.
is N-number of possibilities for the car to make knocking noise or any other
kind of noise.
step by step troubleshooting this problem, I suggest you to refer the help
links mentioned below. Its a complete solution with proper explanation to
identify the cause of problem: ------
the link below: -----
CAR NOISE ISSUES
Dec 07, 2012 | 2008 GMC Sierra Denali
Apr 20, 2012 | 2008 Toyota Camry
Apr 07, 2009 | 1997 Nissan Maxima
177 people viewed this question
Usually answered in minutes!