problem after replacing all my brake pads - VR

[VRcommondoor]

Hi guys, just hoping someone might be able to steer me in the right direction.

I just replaced all the brake pads in my VR and since then have had this awful squealing noise that happens only when braking from about 60kms/hr or higher and the noise kicks in around 20kms/hr. The noise stays until the car is stationary, then when I drive off again they are silent.

When I removed the old pads the inner pad on the passenger rear was excessively worn.

When I mentioned all this to someone they suggested adjusting the middle nut where the calipers bolt on, someone else suggested applying grease to a slider... what is the slider?

Any help with this is appreciated... cheers

P.S. the car stops well

[westbad]

copper grease is your friend apply it to the back of the pads where the piston meets the pads.

[strgas]

caliper slides are the pins which the alloy part of the caliper slides on inside the cast iron frame bolted to the diff , clean and grease these slide pins to allow the caliper to move with ease and not drag the pads , to lube these slide pins you can unbolt the caliper from the diff housing and slide the two parts of the caliper apart clean and grease both parts of the slide pins , or you can unbolt one of the slide pins and simply flip the inner caliper part up and then remove it from the caliper bracket once again clean and grease both pin and hole in the bracket , use copper grease or molly bond grease , any good high temp anti seize compound is good HTB grease will work but over time can clag the pins once again , check or slide seal rubbers for splits and cracking ,

[strgas]

copper grease on the back of the pads will attract and hold the brake dust where you dont want it , aussie kwik grip adhesive works well as it seals the piston to the pad and once dry wont allow brake dust between the moving parts apply to the outer pad where it contacts the caliper too .

[jetboy]

id be checking to make sure the anti rattle plates an springs are in correctly

[jetboy]

id be checking to make sure the anti rattle plates an springs are in correctly

oh man im new here tryin work it all out

[jetboy]

how the hell do u start a thread on here

[VRcommondoor]

sorry if this sounds really dumb, but:

i cant find this "slider pins". Must i undo the middle bolt (the 2 bolts holing the caliper in place screw into what appears to be the inside of a second bolt (my middle bolt, lol) with a rubber boot sort of thing over it), to get to this? If so where do i reset it to when putting it back in place?

Thanks guys for the quick responses

[strgas]

the two 15mm bolts do screw into the slide pins which are under the rubber boots .

[James39]

I suggest not touching your brakes, sound like you are unsure what is what there.
Best to leave it alone until you know what you doing....

[VRcommondoor]

I suggest not touching your brakes, sound like you are unsure what is what there.
Best to leave it alone until you know what you doing....

I can figure most things myself, after all it is a car and runs using pretty basic principles and with a little common sense and problem solving skills most issues can be overcome. From time to time like a little clarification and re-assurance as I am not overly familiar with all the names of parts and terminologies yet. But thanks for the concern, brakes are as we all know vital... Due for pink slip soon anyway so all will be ironed out then, just saving on $$$ for the monkey jobs ;P


So is the (17mm) fitting that the 15mm bolts into the "slider"

[westbad]

A little copper grease in there will stop the noise.. and it wont hurt if brake dust does stick to it!!

Heres a diagram that may help you with locating parts.




not a commodore caliper but will give you a rough idea of part names etc

[strgas]

yes the 17mm hex head you can see is the start of the slide unbolt it and have a squiz , dont use wd40 or crc around brake rubbers as it can react with the brake rubbers .

[strgas]

http://www.realoem.com/bmw/diagrams/z/h/136.png
check this diagram

[strgas]

BRAKE PAD SQUEAL AND OTHER NOISE PROBLEMS

Basically the noises heard from the brake systems (assuming that the pads are not simply
worn out) are dividable into two types of noise.
A GRINDING SOUND and BREAK SQUEAL. Brake squeal is a common problem and is the
nightmare of all pad manufacturers. It is caused when the pad “bounces” in a calliper and the
squeal noise is resonance between the back plate and the piston.
The grinding noise that is sometimes heard (more frequently with semi metallic not Asbestos
pads) is somewhat unnerving and sometimes tends to sound as though the pads are
completely worn out.
The third noise, which can come from the brake system, is after the fitting of grooved or
drilled brake rotors, which can be a whirring or aeroplane type sound.
We have found that the fixes for all of these problems are as follows;
Applying plastic shims to the rear of the pad can dampen this, but these are expensive and
to fit them on every pad where the incidence of brake squeal can be only 1 in 10 is false
economy. These are however, available, as a low cost accessory item.
We definitely do not recommend the use of general workshop greases, especially Coppaslip
on the back of brake pads as these are a friction reducing agent being applied in the area of
the only part of your vehicle which is designed to produce friction – the brakes. There are,
however, some “paint on” anti squeal silicone/rubber based materials, which are viscous
enough to stay where they are placed and are useful in reducing brake squeal.

[VRcommondoor]

Thanks for all the help and comprehensive information... I will go troubleshoot this over the weekend and let you all know what fixed the issue.

[RX25SE]

I place a small dab of copper grease on the leading edge (where it contacts the caliper bracket) and some 'CRC disc brake quiet' on the back of the pads. Lube the slides with moly grease. I've done heaps this way and not one squeak.
If they are squeaking you can usually see a polished/ rusty spot on the pads leading edge. This is where the squeak comes from.

[VRcommondoor]

Hi all... sorry for the loooooong delay on the feedback (life sort of gets in the way sometimes) but...

I went to SCA and asked about copper grease and the guy just gave me a dumb blank look. He showed me to the grease shelf, and there was nothing called copper grease to be found. I ended up buying some other grease suitable for high heat applications etc. (forget what it said on the label but I sounded like what I needed and specifically mentioned brake calipers). A bit of this stuff on the slide pins/locating pins, go for a drive and bliss to my ears.... silent brakes.

Thanks guys for all your help, particularly "westbad" for the diagrams... really helpful, wouldn't have gone much farther without em.