New Rear brakes Squeak/ Squeal on right turns.

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Doc

Doc

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2 weeks ago I replaced the entire rear braking system in my 80. New rotors/ calipers/ pads/ even caliper brackets.

I bled the system really well, and took it for a test drive. The truck now has the habit of squealing or squeaking on right hand turns only. Also, it seems to be coming from the left rear wheel. At first (2 weeks ago) it was a long squeal, definitely a rotational noise because of the way it would get soft and loud on a regular basis based on vehicle speed.

Over the last week the squeal has progressed into a shorter squeak, but it's still there, only on right turns- still from the left rear side.

I was guessing it was the new pads breaking in, but I'm not sure. I can't really see anything rubbing when I look back there, but I can't really examine it while making right hand turns at speed.

Why would anything back there flex under turns?

Any ideas on the source of the squeak/squeal?

PS, my rear brakes must not have been working very well before, because the 80 is a little quicker to stop now.
 
How would I check that?

I would think they would be fine, no? They weren't making any noise before the brake job.
 
You would check them just like the front bearings grab the wheel at 12 and 6 and see if there is any play
Just a thought
Maybe something caught in the ebrake drum
 
haaha i had the same problem 2 when i did my brakes, My noise was coming from the hardware you install into the caliper. You have to be very careful they are put in the right way , and that they are centered. after that make sure you torque you wheels correctly and test drive it , 99.99 thats your problem.
 
Well, shortly after this summer weather took hold here in Utah and I started getting out more in the cruiser, some light wheeling and scouting for hunting season. Pretty soon after that, the noise stopped. So, I don't know if it was just wearing in, or what exactly occurred, but it's gone.

So, the Doc is giving you a prescription to go wheeling. Take daily until symptoms disappear.
 
Thanks, Doc. I'll be back in the shop tomorrow and plan on rechecking torque and such anyway since the tools are all still out. Plus, I didn't get my parking brake adjustment right (replaced the rusted out bell crank assemblies) so wheels need to come off anyway.

I wish there was somewhere to wheel around here but our one place, Uwharrie National Forest, closes Dec-Apr. I got the 80 a few weeks after they closed, about the same time I put new rubber on the 40 - I'm dying to try my 2 new toys!

--john
 
I also just drove mine a while , made some very drastic turns multiple times in both directions and it went away. AND LOOK AT THE HARDWARE!!!!!!!!!!!!!!!!!
 
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JohnVee said:
Thanks, Doc. I'll be back in the shop tomorrow and plan on rechecking torque and such anyway since the tools are all still out. Plus, I didn't get my parking brake adjustment right (replaced the rusted out bell crank assemblies) so wheels need to come off anyway.

I wish there was somewhere to wheel around here but our one place, Uwharrie National Forest, closes Dec-Apr. I got the 80 a few weeks after they closed, about the same time I put new rubber on the 40 - I'm dying to try my 2 new toys!

--john
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@JohnVee did you ever find out what was causing your noise. I just changed my rear pads and rotors and now have a pseudo rub/grind sound when turning right coming from driver side rear. Please let me know.
 
I just did the full brake job on mine and had the VERY same issue, Ended up being one of the retaining clips was sticking to far in on the inboard (rotor side) of the caliper bracket. Pulled the caliper, pulled the pads and the offending clip. A tap with a ball peen to the offending tab against the vice jaws, reassembled and all gone.

My new calipers were Beck&Arenly with EBC green pads..... Side note, I am not to happy with the B&A stuff lately, had to send a Fresh remand caliper back due to incomplete machined surface on the banjo bolt mating surface but fixed that with a hand file, only to find out the bleeder screw was not properly machined so it would not seat and seal either...
 
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If I were you I'd still check rear bearing tension.

Loose bearings may have allowed the hub to wobble enough to allow whatever was making the noise to make noise.. But just because the brakes have bedded and stopped making noise doesn't meant the hubs are now tight.
 
mtkreitz said:
@JohnVee did you ever find out what was causing your noise. I just changed my rear pads and rotors and now have a pseudo rub/grind sound when turning right coming from driver side rear. Please let me know.
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It's been a long time. I can't recall if I removed the clips or if it just went away. I think it went away after a short time.
 
Side load.....something a hair out of place rubbing. If it just goes away, most likely friction wore the clip or whatever down just enough to clear the moving part. Jmo
 
So the wheel bearing was a bit loose. Took it all apart, repacked the bearing and put it together thinking I had it licked.

WRONG...

Well at least the rear drivers side wheel bearing is tight again. Planning to pull the calipers off tomorrow and see if I can see anything out of place. If not, I may swap the rear discs to see if the problem moves with the discs...
 
So thanks to everyone that contributed ideas. Thankfully the rubbing sound is now fixed! :bounce:

It turned out to be the inside edge of the disc brake rubbing on one of the raised areas on the backing plate that the emergency disc shoes rests on.
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Makes sense now why some people say it goes away with time. If it grinds the backing plate or the rotor enough to clearance itself the sound should stop.

Might be wear on the rear bearings that causes it, who knows. All I can say is that it is nice to know what it was for sure.

I took the rotor off, ground it down a bit with a Dremel and lubricated it and the backing plate with some high-temp disc brake grease.

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Had the rear pads changed a few weeks back and all was fine. Tried the parking brake the other day and now have the squeal /rubbing others are talking about here. Need to pull the wheel and see what the issue is for real, but at least I have a place to start. Mine happens when first driving in the morning or when making a left turn. Seems to be coming from the left rear.
 
Cass007 said:
Had the rear pads changed a few weeks back and all was fine. Tried the parking brake the other day and now have the squeal /rubbing others are talking about here. Need to pull the wheel and see what the issue is for real, but at least I have a place to start. Mine happens when first driving in the morning or when making a left turn. Seems to be coming from the left rear.
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When you tried the parking brake, had you previously service the parking brake linkage? These are known to be an issue and get very rusty and tend to bind unless used daily. I had to take mine all apart, hammer out a couple pins, then get new retainers, and clean and paint all the parts. Then I packed the rubber boots FULL of white lithium grease to keep out water and the keep the brake hardware lubed.

I'll bet it's binding at the rear wheels. Get a hammer and lay under the back of the truck and tap the parking brake lever arm to get it to release. Then either use it and repeat or take it apart, clean and lube and reassemble.
 
Any idea if the parking brake is actually supposed to hold the truck solid? I know the P-brake does in my manual sports cars, but the weigh 1/3 what the truck weighs. It needs an adjustment at minimum since it doesn't hold the truck at all.
 
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