Iam almost at the end of my rope with these moaning and groaning rear disc brakes.

I have over the last 2 years or so (since this trouble began) replaced pads numerous times, installed new rotors, rebuilt the calipers, replaced the shims. all to no avail.

Can someone please help, the only thing (and this maybe a clue) that has helped has been machining the discs, Although this only lasts a coupla months.

Cheers Sue

 

A few questions for you:

1. Is there any chance that something might be bent back there? This may cause uneven wear.

2. You said that machining the rotors helped for a bit. Have you looked at them lately? See if there is any scoring present, and that may help track down the root of the problem.

3. Do the brakes seem to drag at all?

4. Do the wheels feel hot after driving on the highway for a while? (sign of dragging brakes).

That's all I can think of. Answers to these questions may shake something loose though. Good luck!

 

Thanks for the quick reply and suggestions.

Doubt very much if something is bent back there, problem started after owning the car for a year or so.

Yeah, brand new outa the box rotors. (seems I replaced perfectly good ones)

Don't know if the brakes are draging at all, you say the wheels themselves would be hot?

Thanks Sue

 

Yeah, if they're dragging bad enough they will heat up the wheel (don't ask how I know this!).

Would still like to know if there has been any unusual wear on your rotors though...

 

The rotors haven't been in long enough I dont think, there is some glazing however, no ware that I can make out. Remove the glazing be it by bita sandpapaer or machining and moaning is gone till they glaze up again.

This experience is over the two sets of rotors, the new ones have only been in a month or so and are moaning now.

Wet days like today are unbearable.

Iam at a loss.

 

Couple of questions.

Have you done anything with the front brakes? Are they working properly? Are they weaker than they used to be.

Do your brake pads match front and rear? Same brand and compund.

Have you flushed the entire brake system?

Are the caliper pins shiny and do they move freely? Are you lubeing the pins?

Are the pads wearing evenly between the inners and outers?

How's the master cylinder? Has it been replaced? If so were lines to the proportioning valve connected correctly?

Replacement pads will glaze if used too hard when new. They ususally need some break in.

 

Sorry, that was more than a couple of questions.

 

when replacing your pads, did your new calipers have the retaining springs? If so, did you use them?

 

1.) Remove rotor. Coat Hub where it contacts rotor in a thin layer of grease.

2.) Coat backs of pads where they contact the caliper and piston with grease.

3.) Coat area where wheel contacts rotor with grease.

DO NOT GET GREASE ON THE FRICTION SURFACE OF THE ROTOR OR PADS.

THis solves 90% of brake problems... When you rub two materials together as brakes do, you're bound to get some vibration, it's inevit inevitable... INEVITABLE! It's reverberation through the car's chassis causes it to be louder. The grease dampens the vibration

 

You may have a bent axle or worn wheel bearing that is causing movement in the brake assembly?

 

Thanks all for your help.

Trochoid,
Front brakes seem to work fine.
Dont think front and back do match, but will after today. The sydstem has been fully flushed a number of times. Brake blokes are having the car this arvo so I will get them to check the caliper pins. Finally, yes new master cylinder.

Waapst
Retaining spring, if you mean shims, the flat thin metal whosits, then yes.

Pele
This will be done today.

Jon
It would surprise me greatly if anything on the back of the car were bent.

Thanks again for your imput


Cheers Sue