BRAKE Problem
#1
BRAKE Problem
Hello every. I am new to yotatech and i have been reading constantly every day since i joined. I have a 97 4runner 2wd sr5 auto with 169xxx on it. I just recently purchased it. The other day i was driving, in a hurry. I was driving fast and of course when drivng fast you have to break hard. well about after 10 mins of navagating through back street short cuts (lots of speed bums and stop signs) i could smell my breaks and even see them smoking with i came to a complete stop. Now i understand that when drving hard you are using your breaks harshly, but i do not think i was abusing them that way, and not to mention that it was a cold rainy day. And even now that i am paying more attention to them i notice that even everyday driving will result in a break oder. everything appears to be okay, i am not sure where to go from here. Any advice would be a big help! Thanks!
#2
Contributing Member
Smoke/smell was definitely coming from brakes? Smoke from all 4 brakes??? Front(s)? Rear(s)? If rears is there any sign stuff has been leaking out of the drum (look on insides of tires for splattered oily stuff)?
Last edited by habanero; 11-18-2011 at 05:39 AM.
#3
Smoke and smell def coming from the FRONT breaks. the truck was not under load, my E break was not on. and like i said, there really was no reason for them to be getting smoking hot. even today when i got out of the truck i bent down and i could feel the extreme heat coming off the breaks and i could kinda see what looks to be metal chippings, but i dont know for sure.
#6
Not too bad. Put the front on jack stands now, turn the engine on, and press the brake pedal a few times. Then go and spin the front wheels with your hands. They should make several revolutions from a push.
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#9
Registered User
iTrader: (1)
Looks like really warped rotors.
Hard to tell from the pictures . I would pull the caliper up out of the way and check with a dial indicator to check run out. Which is .15mm
Another thing it could be but both sides is that the for some reason a washer got underneath the rotor when installed but both sides.
I will be curious how this plays out.
Hard to tell from the pictures . I would pull the caliper up out of the way and check with a dial indicator to check run out. Which is .15mm
Another thing it could be but both sides is that the for some reason a washer got underneath the rotor when installed but both sides.
I will be curious how this plays out.
#10
#11
Looks like really warped rotors.
Hard to tell from the pictures . I would pull the caliper up out of the way and check with a dial indicator to check run out. Which is .15mm
Another thing it could be but both sides is that the for some reason a washer got underneath the rotor when installed but both sides.
I will be curious how this plays out.
Hard to tell from the pictures . I would pull the caliper up out of the way and check with a dial indicator to check run out. Which is .15mm
Another thing it could be but both sides is that the for some reason a washer got underneath the rotor when installed but both sides.
I will be curious how this plays out.
#12
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Join Date: May 2006
Location: Orland Park, Il.
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Try pushing the pistons back into the calipers. All 4 in each caliper. If they all push in relatively easily, your calipers are probably OK. Now make sure the pads aren't binding. i.e. stuck on rusty guide rods or rusty caliper body like mine were. ( Chances are, if you've never flushed your brake fluid, your calipers are probably shot) Brake fluid absorbs moisture from the air and lowers the boiling point of the fluid which can cause the pads to drag. If the calipers check out ok, and there are no kinked or crushed brake lines, try flushing the brake system... hopefully you,ll be lucky. Watch the fluid level in the res. when you,re pushing the pistons into the calipers so you don't overflow it.
#13
When you say 'it sounds like the brake is still engaged' that's normal. It's not bicycle rim brakes, it doesn't have to float on air. The side where it grabs the caliper, that's certainly a warped disk, but it's not that bad. Your hands pushing those disks around is about 25 watts of energy. Briskly stopping a car is over 100,000 watts of energy. In other words, that drag isn't going to matter much.
I didn't hear the engine running though. You should start it up and pump the brake pedal a few times. That will simulate real driving conditions as best as you can.
I'd drive around and confirm the brakes are indeed getting hot. An infrared thermometer is best, but just putting the back of your hand near them should be enough, if you say they are hot enough to smell.
I didn't hear the engine running though. You should start it up and pump the brake pedal a few times. That will simulate real driving conditions as best as you can.
I'd drive around and confirm the brakes are indeed getting hot. An infrared thermometer is best, but just putting the back of your hand near them should be enough, if you say they are hot enough to smell.
#14
When you say 'it sounds like the brake is still engaged' that's normal. It's not bicycle rim brakes, it doesn't have to float on air. The side where it grabs the caliper, that's certainly a warped disk, but it's not that bad. Your hands pushing those disks around is about 25 watts of energy. Briskly stopping a car is over 100,000 watts of energy. In other words, that drag isn't going to matter much.
I didn't hear the engine running though. You should start it up and pump the brake pedal a few times. That will simulate real driving conditions as best as you can.
I'd drive around and confirm the brakes are indeed getting hot. An infrared thermometer is best, but just putting the back of your hand near them should be enough, if you say they are hot enough to smell.
I didn't hear the engine running though. You should start it up and pump the brake pedal a few times. That will simulate real driving conditions as best as you can.
I'd drive around and confirm the brakes are indeed getting hot. An infrared thermometer is best, but just putting the back of your hand near them should be enough, if you say they are hot enough to smell.
#15
be sure the disk is not loose when you test it with the wheel off .
you can run a few lugnuts down to be sure
if the calipers are seizing you will see that the inboard pad has significantly more wear than the outward pad
also be sure that the pads are floating on the pins and that there are no grooves on the pins
you can run a few lugnuts down to be sure
if the calipers are seizing you will see that the inboard pad has significantly more wear than the outward pad
also be sure that the pads are floating on the pins and that there are no grooves on the pins
Last edited by dustrider; 11-20-2011 at 09:04 AM.
#17
be sure the disk is not loose when you test it with the wheel off .
you can run a few lugnuts down to be sure
if the calipers are seizing you will see that the inboard pad has significantly more wear than the outward pad
also be sure that the pads are floating on the pins and that there are no grooves on the pins
you can run a few lugnuts down to be sure
if the calipers are seizing you will see that the inboard pad has significantly more wear than the outward pad
also be sure that the pads are floating on the pins and that there are no grooves on the pins
#18
well there ya go , bingo
if I was going to throw down a bet it would be that whoever did the brakes installed new rotors and did not clean off the shipping grease coating , some people arent aware that the disks would be rust coated if it wasnt there and it should be cleaned off before use
it takes a while to burn it off
it could explain the smoke and is probably burned off by now judging by the rust colored look in the video
also , cheap pads will sometimes stink a lot
premium ceramic metalic pads seem to burn cleaner
hard to tell which it is without having my nose there
you can wash the disks down with brake cleaner spray and/or get some high dollar pads
or drive drive it hard till it burns off,( if its the disk coating)
if I was going to throw down a bet it would be that whoever did the brakes installed new rotors and did not clean off the shipping grease coating , some people arent aware that the disks would be rust coated if it wasnt there and it should be cleaned off before use
it takes a while to burn it off
it could explain the smoke and is probably burned off by now judging by the rust colored look in the video
also , cheap pads will sometimes stink a lot
premium ceramic metalic pads seem to burn cleaner
hard to tell which it is without having my nose there
you can wash the disks down with brake cleaner spray and/or get some high dollar pads
or drive drive it hard till it burns off,( if its the disk coating)
Last edited by dustrider; 11-20-2011 at 03:25 PM.
#19
well there ya go , bingo
if I was going to throw down a bet it would be that whoever did the brakes installed new rotors and did not clean off the shipping grease coating , some people arent aware that the disks would be rust coated if it wasnt there and it should be cleaned off before use
it takes a while to burn it off
it could explain the smoke and is probably burned off by now judging by the rust colored look in the video
also , cheap pads will sometimes stink a lot
premium ceramic metalic pads seem to burn cleaner
hard to tell which it is without having my nose there
you can wash the disks down with brake cleaner spray and/or get some high dollar pads
or drive drive it hard till it burns off,( if its the disk coating)
if I was going to throw down a bet it would be that whoever did the brakes installed new rotors and did not clean off the shipping grease coating , some people arent aware that the disks would be rust coated if it wasnt there and it should be cleaned off before use
it takes a while to burn it off
it could explain the smoke and is probably burned off by now judging by the rust colored look in the video
also , cheap pads will sometimes stink a lot
premium ceramic metalic pads seem to burn cleaner
hard to tell which it is without having my nose there
you can wash the disks down with brake cleaner spray and/or get some high dollar pads
or drive drive it hard till it burns off,( if its the disk coating)
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