backing, breaking, clunk, ??
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From: Houston Tx
backing, breaking, clunk, ??
I've been having a strange "clunk" that I feel (and hear) all the way up through the brake pedal when I'm backing out of a drive way. Happens one time after about 10-12ft of backing. First time I thought I ran over a tool or something. It seems to be coming from the rear but I can't swear to it since I can't make it happen on demand (where someone can be listening for where it's coming from). You can feel it through the brake pedal but not the steering wheel. It only happens once and pulling foreward and back again does nothing. Stop for 10 minutes and back out of a parking place and "clunk". Try to make it happen in the street by backing, going foreward does nothing. Seems like something in the suspension slowly creeping foreward while driving then suddenly moving backwards when I touch the brakes in reverse?????????
86 z51, all stock components (original actually with 133k miles)
86 z51, all stock components (original actually with 133k miles)
Thread Starter
Instructor
Joined: Jul 2006
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From: Houston Tx
Originally Posted by vader86
U-joints probably
Safety Car
Joined: Jul 2004
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......when you back out of your driveway for instance, do you hear what you describe as a "clunk", and then a moan or groan from the back, and then does the brake pedal appear to go down a bit that you can feel?....
..if the car is being shifted into gear with foot on the brake and with a very mild acceleration, i would say u-joints or maybe an extremely worn wheel bearing (but that's a reach). if ya hear a clunk with every acceleration from a standing start, i would say u-joints for sure....please advise as to the first paragraph...
...i have changed out rear wheel bearings and u-joints and the rear end is "tight" and i have the above in 1st paragraph. i equate that to the abs self test.....this only happens when i back out of my driveway...i have no vibrations or any other "rolling" symptoms and the car operates in motion spectacularly........
..if the car is being shifted into gear with foot on the brake and with a very mild acceleration, i would say u-joints or maybe an extremely worn wheel bearing (but that's a reach). if ya hear a clunk with every acceleration from a standing start, i would say u-joints for sure....please advise as to the first paragraph...
...i have changed out rear wheel bearings and u-joints and the rear end is "tight" and i have the above in 1st paragraph. i equate that to the abs self test.....this only happens when i back out of my driveway...i have no vibrations or any other "rolling" symptoms and the car operates in motion spectacularly........
Thread Starter
Instructor
Joined: Jul 2006
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From: Houston Tx
Originally Posted by Da Mail Man
......when you back out of your driveway for instance, do you hear what you describe as a "clunk", and then a moan or groan from the back, and then does the brake pedal appear to go down a bit that you can feel?....
..if the car is being shifted into gear with foot on the brake and with a very mild acceleration, i would say u-joints or maybe an extremely worn wheel bearing (but that's a reach). if ya hear a clunk with every acceleration from a standing start, i would say u-joints for sure....please advise as to the first paragraph...
...i have changed out rear wheel bearings and u-joints and the rear end is "tight" and i have the above in 1st paragraph. i equate that to the abs self test.....this only happens when i back out of my driveway...i have no vibrations or any other "rolling" symptoms and the car operates in motion spectacularly........
..if the car is being shifted into gear with foot on the brake and with a very mild acceleration, i would say u-joints or maybe an extremely worn wheel bearing (but that's a reach). if ya hear a clunk with every acceleration from a standing start, i would say u-joints for sure....please advise as to the first paragraph...
...i have changed out rear wheel bearings and u-joints and the rear end is "tight" and i have the above in 1st paragraph. i equate that to the abs self test.....this only happens when i back out of my driveway...i have no vibrations or any other "rolling" symptoms and the car operates in motion spectacularly........
Sorry, was in Oklahoma for most of the last week..
What you have posted sounds exactly like what I experience. Car has to be sitting, off for awhile before I can get it to clunk and the brake pedal does drop. Once it's done once, it's perfect until I park it then "clunk" the first time I back it up. Surely hadn't thought about abs.. It's impossible to dublicate a second time without parking the car and letting it sit for a few minutes with the ignition off.
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Safety Car
Joined: Jul 2004
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Originally Posted by Arlon
Sorry, was in Oklahoma for most of the last week..
What you have posted sounds exactly like what I experience. Car has to be sitting, off for awhile before I can get it to clunk and the brake pedal does drop. Once it's done once, it's perfect until I park it then "clunk" the first time I back it up. Surely hadn't thought about abs.. It's impossible to dublicate a second time without parking the car and letting it sit for a few minutes with the ignition off.
What you have posted sounds exactly like what I experience. Car has to be sitting, off for awhile before I can get it to clunk and the brake pedal does drop. Once it's done once, it's perfect until I park it then "clunk" the first time I back it up. Surely hadn't thought about abs.. It's impossible to dublicate a second time without parking the car and letting it sit for a few minutes with the ignition off.
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From: Houston Tx
Maybe not abs.. I replaced the the pads and rotors this weekend and the clunk is completely gone. The rear pads where installed wrong with one side of the little pressure spring clips poking up over the top of the caliper rather than being under it. I think is was the pads sticking and breaking loose on that first backup.. No noise now and now bump feel in the break pedal. It feels like a car is supposed to feel in my opinion.
Getting all the bugs slowly worked out of it.. I'm starting to like it a little better now. Idle is fine, brakes are fine. Half of the weatherstrip is done, other half will go in this weekend (if all goes according to plan). Most of the rattles are gone. Wheels still look like crap after 20 years of total neglect
.. One weekend at a time.. Arlon
Getting all the bugs slowly worked out of it.. I'm starting to like it a little better now. Idle is fine, brakes are fine. Half of the weatherstrip is done, other half will go in this weekend (if all goes according to plan). Most of the rattles are gone. Wheels still look like crap after 20 years of total neglect
.. One weekend at a time.. Arlon
