Brake issues?

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Sep 26, 2021 | 04:53 PM

#16

KU4OJ

Fleet Mechanic

Joined: Jul 2008

Posts: 1,937

Likes: 1,221

From: Southern Crescent

Quote:

Originally Posted by Frank79

Just noticed on my truck that when you slow down and the speedometer gets to around 3-4 mph, the truck seems to “jar or bounce” back and forth slightly until you stop. Truck is 2020 6.7 and only has 2400 miles. Any one else experience this?

Quote:

Originally Posted by Frank79

Yes when brakes are applied coming to a stop.
Yes, this is exactly what it does. "Like the pads grip and ease up, grip and ease up." Sorta feels like the ABS is kicking on and off for the last few seconds.
If I gently let off the brake before it hits 3-4 mph, the grip and ease up, grip and ease up is not that noticeable.
Just took the truck for a drive with my neighbor and upon going from 50-0 like a kid walked in front of your truck, its definitely noticeable.

Quote:

Originally Posted by acadianbob

Could it possibly be the automatic transmission trying to decide what gear to be in?

Quote:

Originally Posted by mwheue

My 6.7 does this also. I noticed that on mine the rpm's bounce a little as it is happening. Almost like the engine is trying to slightly overpower the brakes or the transmission hasn't fully disengaged. If I roll to a stop in neutral it doesn't do it.

Quote:

Originally Posted by ChrisK2001

Mine has done that since the day it was delivered to the dealer. I feel it is the transmission as it is dropping into 1st in prep for speeding back up.

New truck here, under 400 miles and it has done this a time or two, as suggested during a relatively hard braking. I think the transmission is trying to help with a little engine braking, (even though this is a 7.3) but can't downshift fast enough to keep up with the braking required. I haven't watched the tack during hard braking, because usually during hard braking there is something else going on that commands my attention.

I think it's just the transmission downshifting faster than it would like and is harmless. As noted above, one owner reported his truck doesn't do it under load. ( I haven't towed yet) Our trucks seem to do everything better with something of a load.

Sep 26, 2021 | 06:00 PM

#17

zeroo

Cargo Master

Joined: Mar 2005

Posts: 2,368

Likes: 620

Quote:

Originally Posted by Frank79

Just noticed on my truck that when you slow down and the speedometer gets to around 3-4 mph, the truck seems to “jar or bounce” back and forth slightly until you stop.

Truck is 2020 6.7 and only has 2400 miles. Any one else experience this?

could be the tranny thing 2020’s are having.