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Clunking In rear goes away when brake applied? Help!
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xclemjustinx
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PostPosted: Sat Aug 10, 2019 9:05 pm    Post subject: Clunking In rear goes away when brake applied? Help! Reply with quote

Ok so hereís the deal. I am hearing a clunking sound in the rear drivers side of my van. Now I knowwwwwww there has been tons of threads about cv joints/ clunking/ noise. I feel this one is different though. This is my setup.

Burley rear disc conversion.
930 cv joints and upgrades axles (both sides)
Burley rear hub (both sides)
New hub bearings (both sides)
New stub axles and flanges
Fox 2.0 shock
Schwenk coils
Redline grease

All of these parts are only 3,000 miles old

So a couple of days ago I started to hear a clunking sound from what sounds like the drivers side.my first though is cv Joints. Checks my cv joints and they are good to go. When I turn the van right or left sharp, the noise is there but when I brake the noise is completely gone. Also the noise is intermittent. So far the cv joints look good. Tires are good and rotated. Rear disc brakes look good. Flanges and stub axles look good.

Any help on this I would greatly appreciate.
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E1
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PostPosted: Sat Aug 10, 2019 9:45 pm    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

Make sure the wheels aren't loose.

Seriously.
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xclemjustinx
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PostPosted: Sat Aug 10, 2019 9:47 pm    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

Wheels are not loose. They are torqued to 90 ft lbs.
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E1
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PostPosted: Sat Aug 10, 2019 10:56 pm    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

Torqued when the other work was done 3,000 miles ago?
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levi
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PostPosted: Sun Aug 11, 2019 2:18 am    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

I'd check every bolt on both sides, caliper bolts, shock bolts, etc.
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PostPosted: Sun Aug 11, 2019 2:58 am    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

Loose wheel
Loose CV bolts
Binding CV's from excessive lift

Inner boots clamped onto axle?
Remove clamps, center axle shaft in CV's left/ right, clamp boots to axle shaft.

Loose brake mounting hardware
Axle nut loose

Dave
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jlrftype7
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PostPosted: Sun Aug 11, 2019 5:33 am    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

Iím betting a shock bolt is loose... WAG on my part..... Razz
With that much upgraded parts, it will be interesting to hear what they find the source was.... Popcorn
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PostPosted: Sun Aug 11, 2019 8:26 am    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

Is the clunking sound consistent with mph? rpm? Or is it random?
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xclemjustinx
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PostPosted: Sun Aug 11, 2019 8:35 am    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

Every bolt is tight. The clunking sound is consistent with speed. As I go faster it increases. I have not tried to center the axle. I thought since the axles and cv joints were upgraded, this was not required.
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djkeev Premium Member
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PostPosted: Sun Aug 11, 2019 10:32 am    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

xclemjustinx wrote:
Every bolt is tight. The clunking sound is consistent with speed. As I go faster it increases. I have not tried to center the axle. I thought since the axles and cv joints were upgraded, this was not required.


It isn't required but sometimes the shaft moves to one side and starts banging itself at the end of the travel. Centering the shaft and using the boots to hold it in place has been proven to work.

Dave
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xclemjustinx
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PostPosted: Sun Aug 11, 2019 10:49 am    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

I will try that. Thanks.
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PostPosted: Sun Aug 11, 2019 10:52 am    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

Do it on the ground, not jacked up and hanging.
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xclemjustinx
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PostPosted: Sun Aug 11, 2019 1:59 pm    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

Well I canít even move the axles when the van is on the ground.
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PostPosted: Sun Aug 11, 2019 2:41 pm    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

Huh!

Well, do you have grooves in your axle shaft? Same number at each end?
Count the grooves, allow for boot expansion/contraction and clamp on the same groove.

Just put a jack under the lower control arm and take the weight off so the tire can rotate, joints are probably in a tension bind.
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xclemjustinx
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PostPosted: Sun Aug 11, 2019 2:49 pm    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

I have the upgraded axle for the 930 joints. They do not have grooves in them. Iíll jack up the rear just a bit to take tension off and see if that works.
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IdahoDoug
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PostPosted: Sun Aug 11, 2019 9:56 pm    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

I suspect your brake shoes are rattling in the caliper, and when you press the brakes, they stabilize under pressure. The rotors typically have sligjht surface irregularities such as when a vehicle sits for a while there's an outline of the pads that quickly wears off, etc. This is a constant process and can cause the pads to wobble/rattle.

I don't know how you'd do this but driving without the pads, or manually pushing them far off the rotors on a straightaway where you won't press them for long enough to establish if this is it might work. Best.
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GWTWTLW
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PostPosted: Mon Aug 12, 2019 9:02 pm    Post subject: Re: Clunking In rear goes away when brake applied? Help! Reply with quote

What Doug said...

I had a similar experience in my right front. It was a loose pad in the caliper.
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