Water/gurgling sound when braking?
 

Hi, recently I changed my brake pad (Project Mu CR) and braking bleed for about 3 weeks ago.
There is a water/gurgling mix with brake friction grinding sound when braking at low speed(around 0-15mph) ,and seems like the brake not as bit as it used to.
I haven't done any bedding, I just drive normally, and possibly couple hard brake during the past 3 weeks.

What is the problem here? Improper bedding? I checked my brake fluid and the level is okay.

Thanks

You have a video of the noise or a better description? Where's the sound coming from?

Its coming from driver side when braking at low speed, I can hear the friction on the rotor and some kinda water running sound.

Gurgling kinda describes the sound my brakes make when I set off in the morning and the rust gets scratched off the rotors

Sent from my iDroid

Lol, I wish it is just morning dust,, but it happens everytime i brake at low speed.

Bleed it again.

It could be possible you didn't close the bleeder valve all the way close, and might have some air trapped in the lines.

We're gonna need video. But my bet is your brakes just sound funny.

Check your coolant level. If there is actual water gurgling it's probably from there.

Check to make sure both pads on the wheel are properly in place and not loose.

Race pads make terrible sounds at low speed when cold. And cold for them can easily happen driving normally since they have higher operating ranges then other pads.

But a vid would help us guess more accurately

Thanks guys, taking back to the shop today and will update.

ok guys.....here is the update....
According to the mechanic, everything was fine...the bleed, rotor, except...
so the issue was...the surface of the brake pad's compound is degrading due to the item is storing too long...that's why the compound on top of the brake pad surface is very hard to bed in which causing the gurgling sound. Also, the mechanic said he had used 5 set of this brake pad and never have this problem. (We didn't buy at the same vendor).

The part of the brake pad compound degrading due to storage sounds like BS, but everything else sounds right.

I have the Winmax W4 and if you list closely with slow braking, you'll get that gurgling sound.

Yes it is BS. If you are buying brake pads that degrade from sitting on a shelf then you need to get them off your car right this second.

Lol. NEVER go to this mechanic again - you can't put a price on trust, especially when it comes to your car. Brake pad compounds don't degrade from storing too long. The Project Mu CR is a mix of graphite and various metals, tell me how that's going to degrade or make it hard to bed in if it sits in a box?

He BS'd you because he's not going to make any more money from you on this job, and wants you to go away. How are you going to feel if he actually screws something up, you come back to him to get it fixed and he does the same trick to get you out the door?

Aggressive pads are known for not only sounding funny, but changing their sound through their life depending on the state of the transfer film on the rotors (among other things). I bet if you give them a good hard bedding in they will sound different.

My friend always tells me my pads sound like a spaceship. At this point I've tuned the noise out (or I'm losing my hearing) because I don't notice, it's part of the compromise of running a more aggressive pad.