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Brake issue (noise)


cpolyak

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Looking for some guidance as I'm scratching my head chasing a noise that just crept up this evening after some spirited driving.

 

Noticed a cyclical knocking sound, directly related to speed (faster/more frequent, slower/less frequent), while coming back into neighborhood. Got under car, looked around the drivetrain and found one loose bolt with play in it at the driveshaft to rear differential mount. Tightened it and took a test drive.

 

Now, I'm hearing the cyclical noise only when I apply brakes and it seems to be coming from front end of car. I looked around the rotors/calipers and didn't see anything unusual. The noise begins as soon as I slightly depress brake pedal and continues when I firmly press pedal.

 

Thought I'd ask the peanut gallery if they had any guesses to focus the chase as nothing obvious jumped out at me. The noise wasn't present last time I drove the car, which is even more intriguing. 


 

1973 Inka 2002tii (2764445) 

1974 Inka 2002tii (2782629) / Sold

1969 Porsche 912 (129000269) / Sold

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Can you feel the feedback through the brake pedal? A pulsing? Does it go away as you push harder on the brakes?

 

Done any brake or bearing work recently?

rtheriaque wrote:

Carbs: They're necessary and barely controlled fuel leaks that sometimes match the air passing through them.

My build blog:http://www.bmw2002faq.com/blog/163-simeons-blog/

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is the cyclical noise frequency same as tire revolution?

 

is the noise metallic?

Bob

BMWCCA #4844 (#297 of The 308)

1974 2002 Sahara, MM 2400 Rally engine, MM 5 speed and conversion

1976 2002A Anthracite parts car

1991 525i AlpinweiB II

2002 330ci AlpinweiB III

2007 530xiT Titanium Silver

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I don't feel feedback in the pedal and the noise seems to be 1/per revolution. The noise is consistent regardless of pressure applied to pedal. Brakes and bearings are new as of 600 miles ago. 

 

Next step is to pull the wheels and look closer at the front disks/calipers. 

1973 Inka 2002tii (2764445) 

1974 Inka 2002tii (2782629) / Sold

1969 Porsche 912 (129000269) / Sold

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So I pulled the wheels last night and inspected calipers closely. Everything seemed in order and tight. Went for short test drive and it noise was gone. Strange. 

 

Didn't have time for a longer drive but I wonder if heat buildup from the previous long/spirited drive caused something to expand and rub. I'll dig into it more next weekend. Thanks for the suggestions all. 

1973 Inka 2002tii (2764445) 

1974 Inka 2002tii (2782629) / Sold

1969 Porsche 912 (129000269) / Sold

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