collinedw

I just traded my 2008 USB ISF for a 2013 USB ISF. Came in today from Chicago and drove it and felt that the brakes were vibrating too much when pressed firmly. Vibration and noise occurs in response. This is a lexus certified preowned vehicle with 2435 miles on it. Has anyone had this issue or anything like this?

Thanks guys

Looxs

I would check out what was replaced during the cpo process. With that mileage it wouldn't surprise me if the dealership deemed it unnecessary to change prior to being sold as a cpo vehicle.

revolut1on

Sounds like warped rotors. Either due to extreme braking conditions or brakes were sprayed with water whilst they were still too hot.

I would get them to replace the rotors and pads. It is not recommended to machine drilled rotors.

Vervish

iTrader: (4)

I would try re-bedding the brake pads. Sometimes deposits on the pad itself can cause a slight vibration.

Instructions here: http://www.zeckhausen.com/bedding_in_brakes.htm

rmillsISF

I'd take it back to the dealer and make them fix it since it was CPO and you just got it. They should honor that.

flowrider

iTrader: (9)

You may be interested in posts #5 and #6 in this thread:

https://www.clublexus.com/forums/is-...d-braking.html

Lou

revolut1on

Learn something new each day Now I know it's BS when my mechanic says it's warped.

One of my previous rides had shaking upon braking at speed and had it machined twice. Should have tried to bed them in then,

Mydogbella

iTrader: (1)

What does bed them in mean?

shahir18

iTrader: (2)

http://www.tirerack.com/brakes/tech/....jsp?techid=85

http://www.zeckhausen.com/bedding_in_brakes.htm

http://ebcbrakes.com/articles/how-to...ban-driving-2/

https://www.essexparts.com/learning-...rs/post/Bed-in

Basically... "breaking your brake pads in"

lobuxracer

iTrader: (2)

Knowledge is power.

collinedw

Lexus replaced the front rotors and pads bc they were warped and had hairline cracks in them. Thank god it was certified. Lexus took care of me but it should have never happened in the first place.

lobuxracer

iTrader: (2)

According to the factory service manual, cracks are acceptable unless they are longer than 30mm. Unless someone didn't torque the lugs properly, the rotors were not warped, they were not properly bedded and they had uneven pad transfer. This picture shows cracking beyond acceptable limits:



This picture shows a cracked but still perfectly serviceable rotor:

scamsel

the last sentence in that link leaves you hanging, as I don't see any procedures!

"The recommended procedures below should provide you with the information you need to select the bed-in procedure appropriate for your application."

also, does one still follow a bed in procedure when just replacing pads?

flowrider

iTrader: (9)

In a word - YES

Lou

lobuxracer

iTrader: (2)

If you are replacing the pads with the same manufacturer and the same model, no, you don't need to bed them the same as you would if you are changing manufacturer and compound.