Brakes question

[Killr6]

hey guys just put new pads and rotors all round on my car.

quick question how long should it take to wear them in? like as in stop squeaking? ive drove and tested the brakes at different speeds and everything. are there any tip/hints i should do to stop the squeaking?

cheers.

[ffestival]

spray them with wd40?

[scvs6]

Hey mate, they shouldn't squeak when they are new. But from what I have learned with the brakes on my WH Statesman, if you adjust the handbrake too much then it causes a squeaking noise, so I just backed it off a bit and it stopped. But one other thing you can try is roughening up the brake pads and rotors with sand paper or similar, that usually stops the squeaking. It could be the linings as well. What brand of brakes and rotors did you put on?

spray them with wd40?

[Killr6]

yeah i have noticed my handbrake was adjusted a fair bit, might have to adjust back a bit.

[Jesterarts]

Hey mate, they shouldn't squeak when they are new. But from what I have learned with the brakes on my WH Statesman, if you adjust the handbrake too much then it causes a squeaking noise, so I just backed it off a bit and it stopped. But one other thing you can try is roughening up the brake pads and rotors with sand paper or similar, that usually stops the squeaking. It could be the linings as well. What brand of brakes and rotors did you put on?

Err... if they are new they are squeaking because they are not bedded properly. before you ask, google it or do a search on here.

Sanding isn't a good idea for 2 reasons.

1. You are pointlessly damaging the braking surface on the rotor
2. You end up back to square one in regards to bedding the brakes

EDIT:

I did the googling for you, see this link for some info about the why and how:
Instructions for bedding in your brakes

[TrikkBen]

lol sanding rotors.... classic.

[gslrallysport]

Yep, don't sand rotors, it also brings graphite to the surface which prevents the pads from bedding. I've just sent an almost exact version of the below via PM to someone else:

Few questions:
- Were the pads installed on new or machined rotors, or rotors which had previously had another pad's material on it. If you had a previous pad on those rotors, what was it?
- What was the bedding in process?
- How many k's were on the pads before you started spraying CRC? CRC basically stops the pads bedding in, so once sprayed, if the noise doesn't go away, it will never go away...

The other suggestion there is with VT-VZ front pads (which are notorious for noise) is to bend up the two small tabs a little further. Often those tabs aren't bent up high enough, and the large strap that goes across the caliper isn't putting enough pressure on the inside pad.

But to be honest I'd say it will be related to the last set of pads you ran on those rotors if they weren't machined. That's far and away the most common cause of noise post-asbestos days...

Your case is a little different as you've got new rotors but you get the idea...

[scvs6]

Ok sorry, I didn't know that your not supposed to do that, I have been told to do it heaps of times at work, also to the clutch flywheel so they don't have to get it machined.

But still, the handbrake does cause a squeaking noise if it adjusted too much.

Don't know why no-one said anything about HoldenV8's post, if someone actually listened to him that didn't know much about cars, who knows what could happen.

[gslrallysport]

Don't know why no-one said anything about HoldenV8's post, if someone actually listened to him that didn't know much about cars, who knows what could happen.

Ignorance is bliss lol

[Jesterarts]

Ok sorry, I didn't know that your not supposed to do that, I have been told to do it heaps of times at work, also to the clutch flywheel so they don't have to get it machined.

But still, the handbrake does cause a squeaking noise if it adjusted too much.

Don't know why no-one said anything about HoldenV8's post, if someone actually listened to him that didn't know much about cars, who knows what could happen.

You commented on it, I think that was enough.

Plus the fact that I think it's safe to assume most people would know he was just being silly while the advice you provided could was more likely to be acted on.

Next question, where do you work? Please tell me it's not for a workshop because whoever is telling you this is potentially putting peoples lives in danger.

Not your fault obviously since you were told to do it.

[scvs6]

Ok sorry, I didn't know that your not supposed to do that, I have been told to do it heaps of times at work, also to the clutch flywheel so they don't have to get it machined.

But still, the handbrake does cause a squeaking noise if it adjusted too much.

Don't know why no-one said anything about HoldenV8's post, if someone actually listened to him that didn't know much about cars, who knows what could happen.

You commented on it, I think that was enough.

Plus the fact that I think it's safe to assume most people would know he was just being silly while the advice you provided could was more likely to be acted on.

Next question, where do you work? Please tell me it's not for a workshop because whoever is telling you this is potentially putting peoples lives in danger.

Not your fault obviously since you were told to do it.

Oh yeah that's a good point haha.

I do work at a workshop in Melbourne, I don't like sanding rotors or fly wheels but I can't say no to them. But now that my apprenticeship is finished I'm going to be leaving soon and working closer to home.

Thanks for letting me know that it is a bad idea to sand rotors, I have never done it to my cars but that's only because I replaced them when I bought the car and haven't needed to change the brakes since.

[lufkin]

my front left brake sqeaks all the time and goes away with the slightest pressure applied to brake pedal, i have noticed there is a paper thin piece of metal that sits on the calipar before the brake pad thats all bent and out of shape, ive tried fixing it up, but its just mangled, is that paper thin bit even needed? can i just take it out?

[Hangman]

Ok sorry, I didn't know that your not supposed to do that, I have been told to do it heaps of times at work, also to the clutch flywheel so they don't have to get it machined.

Wait, you're told to sand flywheels instead of getting them machined?

WTF?!?!?

[Killr6]

thanks jester for the link on how to bed-in the brakes properly.

and im not dumb enough to put wd40 on them lol. hence why i just ignored his post.

[scvs6]

Yeah but it's not my fault if something goes wrong. I didn't know much at all about cars before I started my apprenticeship and that what they taught me, if the brakes are squeaking then roughen the pads and rotors up with sandpaper. And yes so far every clutch I have done, they have told me to just roughen the flywheel up with sandpaper.

If a car comes in and it needs brakes, they machine or replace the rotors (depending on the thickness).

But don't try and blame me for doing it because that is the way they told me to do it, I already feel bad enough now about doing it since I just found out.

[ffestival]

but wd40 is suposed to fix sqeaks so why wouldnt it work with brakes?

[TrikkBen]

Can't tell if Trolling orrr....

[ffestival]

well it works with my car, i just spray the wd40 inside the rear brake drums and on the front rotors and it stops it for a while

[scvs6]

Can't tell if Trolling orrr....

Nope, just stupid.

[VS Natic]

There is a product made by PBR called anti squeal you put it on the back of the disc pad where it contacts the caliper piston. Its designed to stop or minimise brake squeal.

[Hangman]

Yeah but it's not my fault if something goes wrong. I didn't know much at all about cars before I started my apprenticeship and that what they taught me, if the brakes are squeaking then roughen the pads and rotors up with sandpaper. And yes so far every clutch I have done, they have told me to just roughen the flywheel up with sandpaper.

If a car comes in and it needs brakes, they machine or replace the rotors (depending on the thickness).

But don't try and blame me for doing it because that is the way they told me to do it, I already feel bad enough now about doing it since I just found out.

Not having a go at you mate. But that's ####ing stupid, not to mention dangerous to be teaching people to do that.

The squealing is usually caused by vibration. My torrie brakes squealed bad, got some shims off ebay that go behind the pad and it was all good.