thumping sound when breaking - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

jeb · 11-18-2008, 10:59 PM

i have been constantly working out kinks on my car since i did the swap an i think i have finally just about got them all. but now when i hit the brakes it makes an thumping sound from my rear end that kinda sounds like the diff is trying lock up but i dont see why hitting the brakes would do that. when i am driving tho its fine. any ideas what this could be?

GSXRJJordan · 11-18-2008, 11:02 PM

speed-dependent? brake-pressure dependent? what happens in reverse?

Could be a driveshaft issue, could be a diff issue, could be a brake issue.

Most likely it has to do with your brakes/wheels - check the torque on your wheel lugs first (cause it's easy) and if you can easily get the car up make sure the nuts on the driveshaft/diff bolts are solid. What changes the sound? Braking? Speed?

allntrlundrgrnd · 11-18-2008, 11:09 PM

warped rotors? can you feel it?

jeb · 11-18-2008, 11:18 PM

i only feel it when im brakeing or coming to a stop. its fine in reverse an taking off.i checked the tires an they seem fine.i will take a better look at things in the morning when i can see better but im trying to trouble shoot it early. how could i find out if its the diff?

jeb · 11-18-2008, 11:21 PM

also if it was warped rotors wouldnt i feel it all the time?

*fliprayzin240sx* · 11-19-2008, 06:59 AM

Constant thumping or just a thump or two and then goes away. If its just a thump, im thinking subframe bushing.

SoguRacing · 11-19-2008, 07:06 AM

perhaps worn driveshaft u-joints?

jeb · 11-19-2008, 08:03 AM

its constant the whole time the brake is being used

Sileighty_85 · 11-19-2008, 08:13 AM

worn subframe bushings or loose diff mounting bolts?

GSXRJJordan · 11-19-2008, 11:01 AM

If it's only braking dependent, get your rotors turned (and replace the pads if you haven't already), break them in properly, and re-evaluate. Could definitely be warped rear rotors, although most of the time people warp the fronts, not the rears.

looking4-240 · 11-19-2008, 03:02 PM

worn subframe bushings is possible. but it usually happens when you let off the gas period.....

11-18-2008, 10:59 PM	#1
jeb Zilvia Member Join Date: Sep 2008 Location: here Posts: 239 Trader Rating: (4) Feedback Score: 4 reviews	thumping sound when breaking i have been constantly working out kinks on my car since i did the swap an i think i have finally just about got them all. but now when i hit the brakes it makes an thumping sound from my rear end that kinda sounds like the diff is trying lock up but i dont see why hitting the brakes would do that. when i am driving tho its fine. any ideas what this could be?

11-18-2008, 11:02 PM	#2
GSXRJJordan Post Whore! Join Date: May 2006 Location: San Diego, CA Posts: 9,135 Trader Rating: (19) Rides Gallery: GSXRJJordan Feedback Score: 19 reviews	speed-dependent? brake-pressure dependent? what happens in reverse? Could be a driveshaft issue, could be a diff issue, could be a brake issue. Most likely it has to do with your brakes/wheels - check the torque on your wheel lugs first (cause it's easy) and if you can easily get the car up make sure the nuts on the driveshaft/diff bolts are solid. What changes the sound? Braking? Speed? __________________ Jordan Innovations has a new web site! www.JordanInnovations.com -- All your favorite FD Pro Drifters love it, trust me -- www.JordanInnovations.com

11-18-2008, 11:09 PM	#3
allntrlundrgrnd Nissanaholic! Join Date: Jul 2007 Location: Portland, OR Posts: 2,483 Trader Rating: (17) Rides Gallery: allntrlundrgrnd Feedback Score: 17 reviews	warped rotors? can you feel it? __________________ https://www.instagram.com/kook_180sx

11-19-2008, 06:59 AM	#6
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Constant thumping or just a thump or two and then goes away. If its just a thump, im thinking subframe bushing. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

11-19-2008, 07:06 AM	#7
SoguRacing Post Whore! Join Date: Nov 2007 Location: (714) Age: 39 Posts: 2,967 Trader Rating: (23) Rides Gallery: SoguRacing Feedback Score: 23 reviews	perhaps worn driveshaft u-joints? __________________ Pre Tune Checkup! Compression,LeakDown,Vacuum Test $80. Cams Install: $180

11-18-2008, 11:18 PM	#4
jeb Zilvia Member Join Date: Sep 2008 Location: here Posts: 239 Trader Rating: (4) Feedback Score: 4 reviews	i only feel it when im brakeing or coming to a stop. its fine in reverse an taking off.i checked the tires an they seem fine.i will take a better look at things in the morning when i can see better but im trying to trouble shoot it early. how could i find out if its the diff?

11-18-2008, 11:21 PM	#5
jeb Zilvia Member Join Date: Sep 2008 Location: here Posts: 239 Trader Rating: (4) Feedback Score: 4 reviews	also if it was warped rotors wouldnt i feel it all the time?

11-19-2008, 08:03 AM	#8
jeb Zilvia Member Join Date: Sep 2008 Location: here Posts: 239 Trader Rating: (4) Feedback Score: 4 reviews	its constant the whole time the brake is being used

11-19-2008, 08:13 AM	#9
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	worn subframe bushings or loose diff mounting bolts? __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

11-19-2008, 11:01 AM	#10
GSXRJJordan Post Whore! Join Date: May 2006 Location: San Diego, CA Posts: 9,135 Trader Rating: (19) Rides Gallery: GSXRJJordan Feedback Score: 19 reviews	If it's only braking dependent, get your rotors turned (and replace the pads if you haven't already), break them in properly, and re-evaluate. Could definitely be warped rear rotors, although most of the time people warp the fronts, not the rears. __________________ Jordan Innovations has a new web site! www.JordanInnovations.com -- All your favorite FD Pro Drifters love it, trust me -- www.JordanInnovations.com

11-19-2008, 03:02 PM	#11
looking4-240 Leaky Injector Join Date: Sep 2008 Location: SoCal OC/LA Posts: 101 Trader Rating: (2) Feedback Score: 2 reviews	worn subframe bushings is possible. but it usually happens when you let off the gas period.....