Toyota4runner 1999 why my toyota 4runner when Im running fast and stop fast and back fast and stop fast the wheels keeping breaked for some time? is that a breake problem or is't normally?

https://www.youtube.com/watch?v=dp0haTIErvU this video will point you in the right direction here is a link to a picture https://www.2carpros.com/images/external/79028252.gif

Have you had your wheel bearings checked ? You can check them yourself if you put the wheel and tire off the ground and try to press each side of the wheel in opposite directions and the same on the top and bottom. do this with strength and try to do it fast. If it seems to have slack in it then it is probably your wheel bearing. Your tire alignment could also be out. Have you hit a curb hard or anything? The tire and wheel could also be out of balance. Try having them computer balanced at a tire shop. Sometimes tires with several miles on them will start to wobble. Sometimes the tire weights that are used to balance a tire actually come off and the tire will then be out of balance.

Id get the VIN and go to the Toyota Owners website and see if the previous owner kept up with regularly scheduled maintenance. Then id have the brake calipers checked for frozen pistons....4runners are notorious for that. Id also have the actuator checked on the 4Wheel drive system....this switches it from 4High to 4Low.

The V6's timing chain doesnt get replaced. Only the V8's timing belt.

Good luck!

Calipers need to be replaced.
Brake fluid needs to be flushed completely through 4 wheels.
If you are not comfortable to do it your self then have a shop to do it. These calipers can be rebuilt, but I would go with new ones.It is recommended to have brake fluid flushed every 3 years. The brake fluid is subjected to absorb moisture over time. When it has moisture, it combines with dust causing some clogged up at moving surface locations as cylinders inside calipers. New brake fluid in the line can maintain the brake performance as it is designed to do so. Flushing is not the same as filling up. Good luck.

sounds like a burnt valve or a flat camshaft or a broken rocker arm .is it a 6 cylinder or a 4 cylinder the cost will depend on that

Did you install the bearings correctly, did u pack the bearings right?

You cant tighten down the bearing nut alot, you have to tighten it down, spin the rotor around a few times, losen the nut back up( like barley touching the bearing and then put the nut crown and cotter pin in

could be tie rod ends. but you should have a toyota tech check them.

hope this helped.
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Hello, the torsion bars on toyotas especially the 4 wheel drives can sag over time and I have seen them break also. Matter of fact I had a 4runner break one three times. They were all new. Just the type of roads we have in the good ole USA. Thank you

might be engine running hot check fan..