"Thunk" from under the floorboard when braking? - Ford Powerstroke Diesel Forum
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post #1 of 35 Old 03-14-2007, 08:25 PM Thread Starter
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"Thunk" from under the floorboard when braking?

I'm noticing that almost every time I break I can hear (and feel) a "thunk" as if something is shifting or flexing underneath my truck. Could this be a sign of failing ball joints or other worn front suspension components?

2003 F-350 7.3L FX4

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post #2 of 35 Old 03-15-2007, 06:10 AM
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holy crap, i have that 'thunk' whenever i start out from a light. at first i thought it was a bad motor mount. but its not. now im thinkin tanny mount, what the heck else could it be? i wonder if its the same thing... if i start out real nice and slow it dont do it... does yours thump and u can feel it in your seat? where does it feel like its coming from?

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post #3 of 35 Old 03-15-2007, 06:16 AM
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I get a thunk/pop when I turn the wheel at slow speeds sometimes, but I have jacked it up, shook the wheel up and down, side to side, with NO play, so I am still trying to figure that one out!!

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post #4 of 35 Old 03-15-2007, 06:40 AM
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i have the same thump when appling the brakes sometimes. I am going with ball joints ....if i crawl under i see fresh signs of bright rust washing out of the joint area like something is moving. oh boy 1 more thing to do .
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post #5 of 35 Old 03-15-2007, 06:48 AM
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just cured that problem on mine it was ball joints and sway bar bushings

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post #6 of 35 Old 03-15-2007, 06:51 AM
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Quote:
Originally Posted by Badfish740 View Post
I'm noticing that almost every time I break I can hear (and feel) a "thunk" as if something is shifting or flexing underneath my truck. Could this be a sign of failing ball joints or other worn front suspension components?
Check those balls and also check your brakes to make sure everything is nice and snug
Quote:
Originally Posted by stroker27 View Post
holy crap, i have that 'thunk' whenever i start out from a light. at first i thought it was a bad motor mount. but its not. now im thinkin tanny mount, what the heck else could it be? i wonder if its the same thing... if i start out real nice and slow it dont do it... does yours thump and u can feel it in your seat? where does it feel like its coming from?
Yours sounds like rear end slack...maybe a bad U joint also. Get any vibration at highway speed?

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post #7 of 35 Old 03-15-2007, 06:51 AM Thread Starter
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Looks like I have a whole lot of summer projects to work on...Bad GEM, swaybar bushings/ball joints, and I just realized I have an oil leak! Actually I get the "thunk" from the rear when taking off sometimes too. It also happens when I'm cruising along at say 40-50 mph and I apply throttle to pass. Still sound like a bad rear universal?

2003 F-350 7.3L FX4

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post #8 of 35 Old 03-15-2007, 06:53 AM
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didnt you just buy that thing

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2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
2012 F150 Crew Cab Ecoboost stock for now-Totaled March 12 2015
2006 F250 ECSB Lariat 4x4

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Dually LED lights from Stealth Automotive/Xpedition Outfitters
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post #9 of 35 Old 03-15-2007, 06:56 AM
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Quote:
Originally Posted by Badfish740 View Post
Looks like I have a whole lot of summer projects to work on...Bad GEM, swaybar bushings/ball joints, and I just realized I have an oil leak! Actually I get the "thunk" from the rear when taking off sometimes too. It also happens when I'm cruising along at say 40-50 mph and I apply throttle to pass. Still sound like a bad rear universal?
yeah i agree with clay on that one bad u joint as well. i would get that done asap driveshaft rebuilds arent cheap

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2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
2012 F150 Crew Cab Ecoboost stock for now-Totaled March 12 2015
2006 F250 ECSB Lariat 4x4

Leveling kit, 315/70/17 Kelly TSRs on Method race wheels
ARP studs and OEM gaskets done by Renegade Diesel
ECM and Atlas 40 FICM tuned by Bill at PHP SCT tunes by Truck Source Diesel. Gearhead, Innovative, Wildman and Tyrant diesel
Flowmaster/MBRP Hybrid Exhaust
Edge Insight CTS
Coolant filter
Bulletproof diesel FICM EGR Delete, Oil Cooler and Water Pump, and Light bar.
Dually LED lights from Stealth Automotive/Xpedition Outfitters
No Limit Fab 6.0 Cold Air Intake

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Last edited by Dave; 03-15-2007 at 06:56 AM. Reason: added comment
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post #10 of 35 Old 03-15-2007, 07:02 AM
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I had a thump when I braked. Turns out one of the bolts holdin the caliper braket on had fallen out.

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