I hear a "thud" after braking.

[Parsonmoon]

Hi everyone, I have a 98 ex sport. I have noticed a thud kinda noise that occurs after I brake and come to a stop. I Check the u joints, they seem tight, no play in them. Has anyone had or heard this noise before?

 

[my pos mounty]

Yes, If it is the same as what I had. You need to go jack it up and double check the caliper mounting bracket bolts. The ones that go thru the steering knuckle. I lost one and was unaware of it. The caliper wore a groove right thru the aluminum rim quite quickly.

 

[Parsonmoon]

Thanks, I'll check that out. Heading out to the garage now.

 

[Carguy3J]

If that checks out, you might also want to grease the CV joints in your driveshafts, especially the front. They are know to dry out, and cause clunks.

 

[BrooklynBay]

Welcome to this forum! I've moved your thread into the stock 95-01 section.

 

[scucci]

It might be this: ( you can usually feel the clunk too)- remove the slip yoke boot and clean the splines and then apply grease and add 1 0z. of grease in the boot.

tsb 04-23-7 Driveshaft thump/clunk on light acceleration from a stop or when braking and coming to a stop.

This may be caused by axle wind up creating a stick/slip condition at the rear driveshaft slip yoke splines.

A new grease is available which will greatly reduce the sticking/binding condition.


Parts kits:
F87Z-4K277-AA Drive Shaft Slip Yoke Kit (Steel Shaft)
4L5Z-4K277-AA Drive Shaft Slip Yoke Kit (Aluminum
Shaft)

 

[79broncojosh]

X2 on the slip yoke needing greased!

 

[gijoecam]

x3 on the slip yoke. Common problem across Ford vehicles with driveshafts. Wish they would have fixed this years ago!

 

[Carguy3J]

If that checks out, you might also want to grease the CV joints in your driveshafts, especially the front. They are know to dry out, and cause clunks.

When I said this I was, in fact, referring to the "slip yoke" that the last few people have pointed out. Looking back it at, I guess saying CV-joints wasn't entirely clear, although, the "slip yoke" in the front driveshaft is a CV-joint.....Just sayin'

I found that an easy way to do it, is to get a 2cycle oil mixing syringe that wal-mart ha in the auotmotive section. Remove the clamp on the boot ("front" side of the driveshaft). Slip the rubber tube from the syringe under that to inject the grease, then use zip ties to seal up the boot. I used CV grease. The parts store should have it in individual "packs".

 

[Parsonmoon]

Thanks for all the info. I will check out the "slip yoke". I just replaced the shocks thinking that might help as well. I am also installing new brakes and rotors on the rear. I thought I might rebuild the brake calipers while I'm at it. Hopefully, by doing all this, the thud will go away.

 

[akvanden]

You just fill the boot with grease? I've tried to grease this thing several times now and nothing. I thought you would have had to get the grease where it moves in and out but it's such a horrible angle to get anything in there with that damn boot being to hard to pull back. Any suggested techniques would be very much appreciated.......

 

[Carguy3J]

You just fill the boot with grease? I've tried to grease this thing several times now and nothing. I thought you would have had to get the grease where it moves in and out but it's such a horrible angle to get anything in there with that damn boot being to hard to pull back. Any suggested techniques would be very much appreciated.......

umm, did you read the whole thread? Look at my post (#9). Put the grease into that "syringe" and inject away. It will take quite a bit of grease. I think I used two "bags" of cv grease. Each bag is intended to be th eright amount for one cv-axle joint, I think. Once you get a good amount in, work the cv "ball" around in a circular motion and in/out a little to help spread it around. It also helps if you inject the grease while holding the driveshaft vertically, with the "ball" facing down. This allows gravity to help get the grease up towards the joint.


EDIT: As I was clicking "submit". I re-read your post. I gather you're attempting to do this with the driveshaft installed? It will be much easier with it out.

 

[akvanden]

yeah - just trying to avoid having to remove the drive shaft if at all possible. just might have to though.

 

[Parsonmoon]

Finally, the thud noise went away. I think it was mainly the slip yoke, but I changed the shocks and checked the bolts on the brake calibers, anyway. What I ended up doing was using a lithium spray grease. I sprayed it into each grove, forcing up inside where the yoke slides together. Then I packed the boot full of lithium grease. Wrapped a zip tie around the boot. Took about fifteen minutes. Noise went away. Scucci was right on the money.

 

[BrooklynBay]

Thanks for the update!

 

[IraqVet07]

If that checks out, you might also want to grease the CV joints in your driveshafts, especially the front. They are know to dry out, and cause clunks.

I'm kinda leaning toward this on my girls 4x4 sohc 4.0 seems to only do it though in 4high & 4low is that a common problem just to do it in those selections?

It might be this: ( you can usually feel the clunk too)- remove the slip yoke boot and clean the splines and then apply grease and add 1 0z. of grease in the boot.

tsb 04-23-7 Driveshaft thump/clunk on light acceleration from a stop or when braking and coming to a stop.

This may be caused by axle wind up creating a stick/slip condition at the rear driveshaft slip yoke splines.

A new grease is available which will greatly reduce the sticking/binding condition.


Parts kits:
F87Z-4K277-AA Drive Shaft Slip Yoke Kit (Steel Shaft)
4L5Z-4K277-AA Drive Shaft Slip Yoke Kit (Aluminum
Shaft)

I need to find a DIY or something on this. Esp w/ our 4yr old riding in the truck w/ my finance'. Sound i hear seems to be coming from the front def. i had though at first it was the transfer case lockin up being she is on her 3rd transmission but now this makes more sense.