Cyclic noise under brake application

[adrian]

Please can anybody help ?

I have a 95 3.0l automatic.
I have two symptoms that might be connected, on high frequency road bumping it sounds like I have a loose nut underneath the car.
This might be connected to a cyclic grinding noise under braking on the rear drivers side (this fault is intermittent ).
NSX garage have had the car three times tightened the heat shields and replaced the rear discs but problem keeps returning.
Has anyone had the same symtoms or any ideas what to look at ?

Thanks Adrian

[710]

Hi Adrian,
Can’t help so far, but a while ago I had what sounded like a stone or something in my brakes. It sounded exactly like that, hope it was. The sound came from the rear right side. I stopped and then went on, it was gone. And there where no stones or gravel around anywhere. It was the strangest noise. (It was not the ABS noise from the front, that’s a distinctly different noise). Later I looked, and couldn’t see how a stone could have made that noise for that long (10 metres). And there are no scratches anywhere on the disc etc. Does that sound like your noise?

Just lately I notice a “loose nut” sound while driving on cobbles. Seems to be coming from the front.
And just lately, the ABS has been cycling quite often. The ABS problem is documented quite a lot on NSXprime so I’ll have to look at that one day (or just unplug the ABS…).
So if anyone has had the same sort of noises, please give us your thoughts.

About the “loose nut” sound, I had a similar noise on my Escort, it was the little bracket that holds the hydraulic brake line to the shock absorber body. But not so this time.
Thanks
peter

[adrian]

Hi Peter

Thanks for your reply, the garage thought it could be gravel and removed the calipers and cleaned everything.
They also tried to find the source of the loose nut sound with no joy.
I will just have to live in hope that someone's had the same symptoms and discovered the fault.

Thanks Adrian