[2005STI]

Thought i read this somewhere on these pads, under light braking the brake pedal pulses. Anyone else have this with the Ferodo pads?

Thanks

[jawwadh]

when i had mine they never pulsated... just stopped on a dime.. while squealing lol.

[wdb]

Pulsing brake pedal during light or normal braking means warped rotors. If you can feel it in the steering wheel it is the front rotors.

[2005STI]

Originally Posted by wdb

Pulsing brake pedal during light or normal braking means warped rotors. If you can feel it in the steering wheel it is the front rotors.

Not felt in the steering wheel and under normal braking you do not feel it. only very light braking. The car has 17,000 miles on it. and i just put the pads on, before i put the pads on i did not feel it under light braking

[upncummr]

Another option besides warped rotors is material transfer between the pads and rotors.

Did you clean up the old rotors before installing the new pads? Did you properly bed in the new pads? That involves getting the pads and rotors up to temperature and actually transferring a layer of new pad material onto the surface of the rotors.

In changing from one pad material to another (i.e. stock to Ferrodo) it can take a while for the old pad material to be completely removed and a layer of the new material to be deposited.

I suspect the pulsing will disappear over the course of the next few weeks.

Gary

[2005STI]

Originally Posted by upncummr

Another option besides warped rotors is material transfer between the pads and rotors.

Did you clean up the old rotors before installing the new pads? Did you properly bed in the new pads? That involves getting the pads and rotors up to temperature and actually transferring a layer of new pad material onto the surface of the rotors.

In changing from one pad material to another (i.e. stock to Ferrodo) it can take a while for the old pad material to be completely removed and a layer of the new material to be deposited.

I suspect the pulsing will disappear over the course of the next few weeks.

Gary

You the Man!!! this is what i remember reading before! I bedded them in, then a week later went to the track.

i didn't clean the rotors before install, i just changed the pads and bedded them in.

Thanks!!

[upncummr]

I hope the information proves helpful.

I'm dealing with some brake juddering (jerking and shuddering) right now myself.

Last fall I took the STi to Heartland Park in Topeka and ran hard all day Friday. Although I was using a good pad compound, I ended up going through the pad material all the way down to the bonding agent that is between the pad material and the backing plate. I managed to smear that bonding agent across the face of the rotor.

I put new pads on for Saturday/Sunday, but it's been difficult to get a smooth coating of the new pad material transferred to the rotors. When the brakes are cold, they really judder. You can feel the pads move around the rotor until they hit one of these glue spots and then there's a moment of big drag.

I haven't put enough mileage on the car since then to clean up the rotors yet since it was stored all winter. The problem seems to be getting better now that I'm driving the car a little.

Gary

[2005STI]

Originally Posted by upncummr

I hope the information proves helpful.

I'm dealing with some brake juddering (jerking and shuddering) right now myself.

Last fall I took the STi to Heartland Park in Topeka and ran hard all day Friday. Although I was using a good pad compound, I ended up going through the pad material all the way down to the bonding agent that is between the pad material and the backing plate. I managed to smear that bonding agent across the face of the rotor.

I put new pads on for Saturday/Sunday, but it's been difficult to get a smooth coating of the new pad material transferred to the rotors. When the brakes are cold, they really judder. You can feel the pads move around the rotor until they hit one of these glue spots and then there's a moment of big drag.

I haven't put enough mileage on the car since then to clean up the rotors yet since it was stored all winter. The problem seems to be getting better now that I'm driving the car a little.

Gary

When i put the pads on i use a ton of stop squeel. So much that when i got home from the track it was all over my wheels in chunks, took forever to clean. I wouldn't be surprised if some of it got on the rotor and caused this.

[wdb]

Originally Posted by upncummr

Another option besides warped rotors is material transfer between the pads and rotors.

Does this cause a pulsing brake pedal? Or does it cause the brakes to feel as though they are 'pulsing' under light braking due to variations in friction across the rotor?

[upncummr]

I guess I'd say it would likely be called a pulsing brake pedal.

The situation that I'm describing with my brakes and the incomplete or inconsistent pad transfer onto my rotors is that the rotor doesn't pass "smoothly" through the brake pads during braking. The lighter the braking the more noticeable it is.

There are areas on the rotors that are grabby.

This grabby feeling leads to the feeling of a pulsing brake pedal.

Gary