Brake Gurus step in

[kingstang]

This is not my mustang but a 2006 supercharged range rover I picked up.......Replaced rotors and pads with Powerstop drilled slotted rotors w/Ceramic pads.......What is this noise?




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[csmaan12]

Yikes, I know some brakes make that when you lightly start to roll with the brakes applied, but that sounds extreme...Check the shims maybe where the pads sit, maybe they're scraping against the rotor.

Does it do this while driving and stopping normally? Or just low speed?

 

[kingstang]

Yikes, I know some brakes make that when you lightly start to roll with the brakes applied, but that sounds extreme...Check the shims maybe where the pads sit, maybe they're scraping against the rotor.

Does it do this while driving and stopping normally? Or just low speed?

This is the same Brembo set up we have on the Mustangs, I've disassemble and reassemble and it still makes this God Awful groan. Only does while applying the brakes at low speeds. I have never in my life heard brakes make this noise. I'm beyond stumped.

 

[csmaan12]

This is the same Brembo set up we have on the Mustangs, I've disassemble and reassemble and it still makes this God Awful groan. Only does while applying the brakes at low speeds. I have never in my life heard brakes make this noise. I'm beyond stumped.

This sounds like an extreme example of the groan, but past the sudden braking when you did the slow brake, that sounds normal. I can make our Acura make the same noise. I think it could be just the brake material.

I say just drive it for 50-100 miles to get the brakes to get some wear on them. Also if you have any open roads you should do a bed in for the brakes. Get up to speed, like 45 MPH and smash the brakes without locking up, bring it down to like 5 MPH, accelerate and do that same thing about 3 or 4 more times. Do not fully stop so the rotors can still get air flowing through them.

 

[jasonstang]

Did you apply a light coat of grease between the pads and the shims?

 

[kingstang]

Did you apply a light coat of grease between the pads and the shims?

Jason,
Everything coated with Disc grease.

 

[kingstang]

This sounds like an extreme example of the groan, but past the sudden braking when you did the slow brake, that sounds normal. I can make our Acura make the same noise. I think it could be just the brake material.

I say just drive it for 50-100 miles to get the brakes to get some wear on them. Also if you have any open roads you should do a bed in for the brakes. Get up to speed, like 45 MPH and smash the brakes without locking up, bring it down to like 5 MPH, accelerate and do that same thing about 3 or 4 more times. Do not fully stop so the rotors can still get air flowing through them.

I had went out to bed them in as I've done on all my new brake set-ups, its just when I got to the bottom of my street and heard that sound , I brought back home.........Scared the ish out of me......I think I may switch to a semi metallic pad to see if that changes anything.

 

[jasonstang]

Jason,
Everything coated with Disc grease.

Humm. Try bedding them in per manufactures recommendation?
Maybe certain machining on the rotor or pad texture when new is causing them to get super grabby?
Also are the slider pins tight but not too tight?
It sounds like the caliper is allowing the pad to chatter.

Although in that video the wheel's fore-aft movement when braking is a bit concerning. Reminds me of the control arm bushing failure on the E46 3 series.

 

[kingstang]

Humm. Try bedding them in per manufactures recommendation?
Maybe certain machining on the rotor or pad texture when new is causing them to get super grabby?
Also are the slider pins tight but not too tight?
It sounds like the caliper is allowing the pad to chatter.

Although in that video the wheel's fore-aft movement when braking is a bit concerning. Reminds me of the control arm bushing failure on the E46 3 series.

I'm going to check the suspension components also, its just odd that this only began with the rotor/pad change. I keep everyone posted when I get back to tackling this........Thanks for your input.

 

[TorqueMan]

I'm going to check the suspension components also, its just odd that this only began with the rotor/pad change. I keep everyone posted when I get back to tackling this........Thanks for your input.

Go out and test them in a safe area. Start by making sure the brakes can overpower the engine; if you can make the car move with throttle while you are stepping on the brake pedal then something is wrong, do not drive the car. Then test at slow speed (which it seems you already have), progressively work up to higher speeds. If the brakes bring the car to a stop in what appears to be normal distance and the car is not pulling then the brakes are working. Take a peek at the rotors. If the car is stopping normally and the rotor isn't showing an abnormal wear pattern then I think you can rule out a malfunction or assembly error.

At that point I would try bedding in as others have described.

I used to own a Can Am Spyder (it was actually the wife's) which was notorious for its noisy rear brake. With the stock brake you could make it go away with a few hard applications of the brakes, so most believed the problem was heat related; the brakes were noisy when cool. The solution for most people was a change in pad material. If I recall, anything semi-metallic would result in the same problem, you had to use organic. That meant, of course, less stopping power and a shorter service interval on brake pads.

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