Front brake calipers creaking... Need help!

[surferpkt]

So my front brake calipers have been starting to creak whenever I brake. It's not a squeel or grinding noise just a high pitched creaking as I apply pressure on the break. The car does not need to be in motion for this to occur and braking power as not decreased. The noise however is definately from both front brake calipers and has been getting worse over the past few weeks. At first I thought that maybe the piston seals had worn and need rebuilt, witch would lead to fluid loss, but the fluid levels are all full.
Any ideas on what this would be? It obviously resinates through the whole car and at the frequency its at the radio volume is of no use in drownding out he noise So mark that one off the list as well as using a loud exhaust.

Thanks!

['Nova]

I'd take the caliper off, inspect the pads and the pistons and post some pics.

[fpitas]

Do you mean squealing? Disc brakes sometimes squeal, especially if the pads develop a glaze from not being used hard. Some more information here:
Disc brake squeal

It's usually harmless, but the article discusses some possible fixes if it bugs you.

[surferpkt]

Originally Posted by fpitas

Do you mean squealing? Disc brakes sometimes squeal, especially if the pads develop a glaze from not being used hard. Some more information here:
Disc brake squeal

It's usually harmless, but the article discusses some possible fixes if it bugs you.

Its definately not squealing as it does it even when car is parked and off. It happens mainly at the bottom of braking when you start to feel the pressure build in the the brake pedal when the car is off. While running and in motion this creaking sound occurrs inbetween medium braking and braking hard. This occurs well after pads make contact with the rotor. I've never heard this noise before coming from a brake caliper especially both front calipers at the same time. It is a very odd noise and I'm sure it sounds worse because it resinates through the car. You hear it both inside and outside. If you sit by either front wheel you can hear which of the two is creaking at an instant, though both will make the noise at one point or another.

[fpitas]

Originally Posted by surferpkt

Its definately not squealing as it does it even when car is parked and off. It happens mainly at the bottom of braking when you start to feel the pressure build in the the brake pedal when the car is off. While running and in motion this creaking sound occurrs inbetween medium braking and braking hard. This occurs well after pads make contact with the rotor. I've never heard this noise before coming from a brake caliper especially both front calipers at the same time. It is a very odd noise and I'm sure it sounds worse because it resinates through the car. You hear it both inside and outside. If you sit by either front wheel you can hear which of the two is creaking at an instant, though both will make the noise at one point or another.

It may be time to pull a wheel off and inspect things.

[40mmBrakes]

Sorry to ask, but are you sure it is not the pedal assembly? Perhaps the pivot point has a bad bushing? That would explain why it happens without the car moving.

You say the master cylinder is full; if the pads are not new, it should not be entirely full.

Once the pads contact the rotor there really isn't any more motion, only pressure increase...

[surferpkt]

Originally Posted by 40mmBrakes

Sorry to ask, but are you sure it is not the pedal assembly? Perhaps the pivot point has a bad bushing? That would explain why it happens without the car moving.

You say the master cylinder is full; if the pads are not new, it should not be entirely full.

Once the pads contact the rotor there really isn't any more motion, only pressure increase...

I'm in total agreeance with you, which is why I'm perplexed. The noise definately appears to be from both front calipers. Leaning in to listen it is coming from the caliper. I haven't had the time to remove them yet, but in my initial check the fluids where full, with just a slight orange appearance. The rear pads and the fronts have almost 3/4 pad life left or more. It is as if the pistons that push the pad are making the noise and this happens after the pad makes contact to the rotor and pressure is being increased (whether the car is in motion or not). It definately is a very piculiar sound almost as if an aluminum hinge is in a bind and being forced to move and it bounces back and forth from one wheel to the other. This does not affect the cars braking performance. I've checked the pedal assembly and hing and plunger are working find with no noise localized inside the cabin. The only noise I hear is outside resinating to the inside and it is definately from the outside.

[40mmBrakes]

Does the anti-squeal backing on the brake pad appear intact? I'm sure it's hard to tell when installed.

I just replaced pads on my jeep and went for a "spirited" break-in. The paint on the back of the pads bubbled and cracked and smelled... did this on several braking events but of course stopped after 10 min.

Last gasp would be to change the fluid. Maybe there is an odd mix of water and brake fluid and the pressure or heat is causing something. <--- After reading that it seems like I am almost making things up, since it can't make sense.

[xtn]

surfer -

What a weird problem you have! From your complete description it almost sounds like the caliper bodies themselves are distorting from the pressure. You're definitely going to have to jack up the car and pull a wheel, then sit down by the caliper and inspect it as an assistant induces the noise with the brake pedal.

xtn

[Drag_Race50]

Have you checked the cauter pins inside the caliper? They could be bent or missing. They hold the brake pad in place, and can cause such a noise.

A friend had this happen to him. They replaced the pins, (1 was missing), and it was all good.

[surferpkt]

Originally Posted by Drag_Race50

Have you checked the cauter pins inside the caliper? They could be bent or missing. They hold the brake pad in place, and can cause such a noise.

A friend had this happen to him. They replaced the pins, (1 was missing), and it was all good.

I'm hoping to have some time later this week to pull a wheel and look into this further. I'll definately check the pins and snap some pics.

[surferpkt]

Ok... I found the culprit. Never before have I ran into this issue on a car. Evidently brake dust had accumulated on and round the pistons getting inbetween the brake pad and the piston allowing some minor movement on the back of the pad. I'm not sure what type of pads are on the front calipers, as they came on the car when I bought it. Regular washing and cleaning didn't clear this. I had to flush out and really clean the calipers on and around the pistons to get the accumulated dust out. My guess is that it was the sound of the pistons slightly rubbing underpressure due to the brake dust accumulation between the pistons and the backplates of the pads. Once cleaned the noise has gone away and all seems fine. I didnt get pictures, sorry. Very odd eh...

[Rennstore]

Banking on pad movement - or lack thereof. Siliglide from NAPA on the sliding surfaces of the pads worked on my BMW to correct this -

Craig
www.RennStore.com -- The source for Pagid brake pads
PAGIDS for your LOTUS

[surferpkt]

The noise has once again returned. After a day of silence, the following day I drove 5 hours to Jaxonville to visit some friends and 4 hours into the trip the noise reappeared. Its not quiet as bad as previously, but definately back. Its more annoying than anything. I'll be up here for three weeks and don't have access to the proper tools needed to pull it apart again. Sigh... I'll be back on this subject later, and Rennstore you might be on to something I'll have to try that next.