Screeching noise

2168 Views 18 Replies 10 Participants Last post by Chris D., Apr 30, 2010

UndefinedTaco

Discussion Starter · Mar 16, 2010

Ok, so lately I started noticing this sound.

First of all some information:
99 Tacoma 2wd 2.4
5 speed
4"ish front drop
4.75-5" rear drop

It was only doing it from acceleration, but when I let off..in a low gear(mostly 1st, sometimes 2nd).

Now it does it MOSTLY from heaving braking..or pulsing the brakes.

I thought it was the tire hitting the bed(with 2 people in cab) I'm about a inch from tire to fender contact in the rear...and with the 225 series tires and the +32 offset wheels it rubs during contact.
I ruled that out though as it does it when the bed COMES UP..not down.

Ideas

1. Brake proportioning valve messed up:shrug:
2. Un-greased leaf spring bushings:thinking:
3. I ruled out carrier bearing as that's usually under acceleration AND it's more of a vibration..

I don't believe it's metal to metal contact, it's not high pitched..and it's not a "thud" sound(like axle slamming frame as I have cut bumpstops in there so..it's not metal to metal)

Any ideas:shrug:

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1 - 19 of 19 Posts

YankeeTaco72

· #2 · Mar 16, 2010

Driveshaft?:shrug:

SDRD

· #3 · Mar 16, 2010

is there any way you can get a video of this?

UndefinedTaco

Discussion Starter · #4 · Mar 16, 2010

SDRD said:
is there any way you can get a video of this?

I'll try and have my buddy use my camera tomorrow to do it tomorrow.

Like if it starts happening(the noise) while I'm braking and I step on them harder..it gets louder and does it more..I usually let off and just ease to a stop.

In an emergency..I don't even wanna know what it is.

Manny: I thought about that..but realized I don't think I'm low enough:shrug:
and do our trucks have u joints that mess up:shrug: it's not a vibration though...it's a NOISE.

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tacomaman

· #5 · Mar 16, 2010

Is it coming from the front or rear?

Voodreau

· #6 · Mar 16, 2010

Squeek plate :shrug: Whens the last time you changed your brakes?

UndefinedTaco

Discussion Starter · #7 · Mar 16, 2010

tacomaman said:
Is it coming from the front or rear?

It's coming from the rear, sorry I forgot to mention that.

and I just put new front pads in...pretty worn..past the wear bars
so I didn't notice it before as I barely had any braking power
(but I also wasn't as low either too..as I put new front pads in as I went from a 3/4 to a 6"ish/5..then to a 4/5..but I didn't drive it much at 6"/5"

Maybe it's the rear brake shoes:shrug:
I heard they don't wear down though really? or it depends on circumstances..
122k miles..no heavy hauling (just here and there..no major mileage though)

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tacomaman

· #8 · Mar 16, 2010

Maybe you have the same problem as me. My rear brakes squeak with a drop and bigger wheels but is fine when stock height with steelies. I even lowered the BPV hardware on the pumpkin and that didn't help anything. The brake shoes have 45 angles on the ends also.

UndefinedTaco

Discussion Starter · #9 · Mar 16, 2010

tacomaman said:
Maybe you have the same problem as me. My rear brakes squeak with a drop and bigger wheels but is fine when stock height with steelies. I even lowered the BPV hardware on the pumpkin and that didn't help anything. The brake shoes have 45 angles on the ends also.

Yeah I was thinking of doing something with the BPV

When I had the Hello Kitty Bumstops in and my dirtbike in the back..I heard the bed hit the BPV once...

but I'm not sure.

Oh btw I don't think it does it with weight in the bed(never really pulsed or hit the brakes hard though either with weight)...so that might be a suggestion it's the rear brakes.

Hmm...:thinking:
I'll have to check out the shoes

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Dmonkey

· #10 · Mar 16, 2010

if its a chirping lathe noise, ur drive shaft is hitting something. you can check that by looking for a shiny spot on the drive shaft.

ur proportioning valve itself wont cause any noise unless its fallen off, if your lowered 5 in the rear, with the valve adjusted all the way down its still supplying your rear brakes as if you had ur bed filled, consider flipping it around to the underside like in my build thread. that will apply less brake and actually gives adjust ability (mine is a 6 inch drop in the rear)

if all of that doesnt get it to stop, you probably have glazed rear brakes from the pro valve, take off the drum and use a light sand paper on the drum and pads, clean off all dust with brake cleaner, see if that does it

UndefinedTaco

Discussion Starter · #11 · Mar 16, 2010

Dmonkey said:
if its a chirping lathe noise, ur drive shaft is hitting something. you can check that by looking for a shiny spot on the drive shaft.

ur proportioning valve itself wont cause any noise unless its fallen off, if your lowered 5 in the rear, with the valve adjusted all the way down its still supplying your rear brakes as if you had ur bed filled, consider flipping it around to the underside like in my build thread. that will apply less brake and actually gives adjust ability (mine is a 6 inch drop in the rear)

if all of that doesnt get it to stop, you probably have glazed rear brakes from the pro valve, take off the drum and use a light sand paper on the drum and pads, clean off all dust with brake cleaner, see if that does it

Yeah I'm thinking I'm getting too much pressure to the rear right now...not too much where they lock up(so at least the valve is doing it's job), but enough to be ab-normal for what's going on(no weight in bed)

I'm gonna jack it up and check out the idea of flipping it tomorrow...good ideas Branden! thanks

I highly doubt it's the driveshaft, only at 5"(might even be 4.75..)..not sure never measured and don't have an accurate way to find out..

but I'll look into the driveshaft too

Proteus503

· #12 · Mar 16, 2010 (Edited)

pull your drums off and have a look. if they're glazed over then that is probably the source of your squeel.

if you have some 100+ grit sand paper laying around, give the insides of the drums a quick pass with the sand paper using a circular motion, dust 'em off, hose 'em out with some brake cleaner, and reassemble. Though this is a temporary fix, it will let you know if the drums are the problem. generally this trick doesnt last long, so if it does fix the problem, i'd recommend new drums in the near future.

I have also heard of the automatic adjusters on the rear drums going bad... but usually only on lifted 4x4's. might be worth jacking up the rear end and spinning the wheels to check the drag on them.

also, with regards to the brake proportioning valve... it doesnt matter if this valve is adjusted properly or not with regards to hanging brakes. the BPV only adjusts the ammount of pressure that the rear brakes can get, it does not affect whether or not the rear brakes are on or off. I know pleanty of off-road folks who've jacked their trucks up enough to where they have no idea where the BPV rod is supposed to be set, so they just zip tie it all the way up to the bed bottom so the rear brakes are getting a full 50% share of the brake pressure.

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UndefinedTaco

Discussion Starter · #13 · Mar 16, 2010

Well after I put new pads in..

I adjusted the rears like I always do when I put new pads in front
(back up, hit brakes, repeat)

This sound didn't start happening till about a week ago
(been like 3ish weeks since new pads?)

So now you mention the auto adjusters..I think there failing
_____

and I'll look into de-glazing the rear, I did the fronts myself with some 200grit when I put new pads in...works like a charm.

_____

Thanks for clearing up how the BPV works..didn't know that

It's funny though, when I was doing the front brakes..I was thinking "Hmm I should look at the rears I have a feeling there worn too"

"Nah I've done so much work on this truck in the past 3-4 weeks..I just wanna drive it now!"

So I never did...bad idea lol

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Dmonkey

· #14 · Mar 17, 2010

i re read what i wrote about the proportioning valve, and that'll just balance your breaking out to 80/20 or whatever its supposed to be.

if you adjust your brakes they'll still squeel, I think they're glazed from being used 50/50 from ur valve being all the way up after the drop

just use 100 grit like proteus said and you'll be set, remember to do the drums and the pads

or you can run it down a dirt road with ur foot lightly on the brake

UndefinedTaco

Discussion Starter · #15 · Mar 17, 2010

Dmonkey said:
i re read what i wrote about the proportioning valve, and that'll just balance your breaking out to 80/20 or whatever its supposed to be.

if you adjust your brakes they'll still squeel, I think they're glazed from being used 50/50 from ur valve being all the way up after the drop

just use 100 grit like proteus said and you'll be set, remember to do the drums and the pads

or you can run it down a dirt road with ur foot lightly on the brake

Hmmm that 2nd statement you said makes sense..

I did a little hard braking today and it didn't do it actually..I think it did it once.

It actually did it when I let off the gas on high rpms in 1st

Hopefully I'll have time to jack it up and check it out tomorrow...:waytogo:

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Bandito

· #16 · Apr 30, 2010

This sounds like a problem I am having. I suspect it might be the U-joints or the Cardan joint. The noise is a high pitch screeching noise when I press the gas, I checked the driveshaft and noticed a loose and un-greased u-joint. I plan on replacing them soon and see if that fixes the problem.

default83

· #17 · Apr 30, 2010

Bandito said:
This sounds like a problem I am having. I suspect it might be the U-joints or the Cardan joint. The noise is a high pitch screeching noise when I press the gas, I checked the driveshaft and noticed a loose and un-greased u-joint. I plan on replacing them soon and see if that fixes the problem.

fix them now. trust me on this. dont put off really bad u joints. it will be hell if they go out while driving.

Bandito

· #18 · Apr 30, 2010

yea, my thoughts exactly. Thankfully I have a second car to drive, the Taco is in the driveway for a week.

Question: I went to a few auto parts store looking for U-joints for my cardan joint right behind the center carrier berring. All the store say they dont have the u-joint for that. Anyone know what's up?

Chris D.

· #19 · Apr 30, 2010 (Edited)

undo your rear break perportioning valve bar on the axle and zip tie it higher upward,
take it for a drive and see if it goes away.. It's either a 10mm or 12mm bolt to undo..

the torque you only really see from the first 2 gears is causes the suspension
enough to make the ride height change causing the brakes to drag a little bit..

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