Noise when braking.

[Lombardi]

Hello there.

My car makes this metallic rattling noise under braking.

Driving at faster or slower speeds and braking doesn´t seem to change the pitch or intensity.
Sometimes the noise appears on bumpy roads, even at low speed and not using the brakes at all.

One thing that happened before was the fan touching the radiator shroud, making a very similar noise.
I have secured the shroud to the point it doesn´t move at all now.

Radiator is firm in position, so it´s not moving against the fan or something like that.

It´s a 90/91 124.036

 

[emerydc8]

If your motor mounts are flat it could cause the fan to rub on the shroud as the engine tilts forward during braking or on bumpy roads. I would check your motor mounts. I believe @gsxr did a post here on how much space there should be between the pan and cross-member.

EDIT: My bad. It was @Jlaa who did a write-up on this.

Motor Mount Age of Replacement and While You Are In There | M119 Engine

Hi gang, One drawback to eliminating primary order vibration is that it makes you (me) so sensitive to vibrations that you (me) notice secondary and tertiary order vibrations. As a recap, I recently replaced my tires which were slightly flat spotted, which were causing primary order...

www.500eboard.co

 

[Jlaa]

If your motor mounts are flat it could cause the fan to rub on the shroud as the engine tilts forward during braking or on bumpy roads. I would check your motor mounts. I believe @gsxr did a post here on how much space there should be between the pan and cross-member.

EDIT: My bad. It was @Jlaa who did a write-up on this.

Motor Mount Age of Replacement and While You Are In There | M119 Engine

Hi gang, One drawback to eliminating primary order vibration is that it makes you (me) so sensitive to vibrations that you (me) notice secondary and tertiary order vibrations. As a recap, I recently replaced my tires which were slightly flat spotted, which were causing primary order...

www.500eboard.co

Hah, that was GSXR's original picture with the measurement. I just used it and re-measured on my own car!

 

[Lombardi]

Thank you, guys.
Will check that.

 

[Lombardi]

So, radiator support crossmember was a little bent.
Tied a rope to it and around a tree and reversed the car.
Noise gone.