Front brake job.. What went wrong???

2003_GT · Feb 14, 2009

I changed the brake pads on my stang i thought all went well but when i took it out for a test drive the car begins to shake: it does like a stop and go kinda thing when i apply the brakes especially at highway speeds... Can anybody tell me what it is i did wrong and how to fix it PLEASE

Thanks everyone

BK_CAULEY · Feb 14, 2009

Did you bleed the brakes properly? did you put your hands all over the rotors? might have got alot of grease on them.

2003_GT · Feb 14, 2009

Red198 said:
Did you bleed the brakes properly? did you put your hands all over the rotors? might have got alot of grease on them.

I hardly, if at all, touched the rotors, and i didnt open any of the bleeder screws or anything since all i did was change the pads, should i try bleeding the system???

hotdog71 · Feb 14, 2009

Did you grease the back and top and bottom of the pads?

how does the peddle feel, soft or hard or normal?

2003_GT · Feb 14, 2009

hotdog71 said:
Did you grease the back and top and bottom of the pads?

how does the peddle feel, soft or hard or normal?

Pedal feels soft, spongy like

hotdog71 · Feb 14, 2009

Sounds to me like you need to bleed them the peddle should feel fairly firm and not fad when you stomp on the brake.

I think its right side then left (drivers) bleed sequence. You need to some someone help unless you have one way bleed valve installed.

This is how I did mine: Open valve, and have someone press and hold peddle all the down, lifting off will allow air to get in so close the valve and then let off brake repeat until no bubbles are seen in the fluid.

You don't really need to bleed the rear brakes since the system is split front to back.

good luck

mransr · Feb 14, 2009

are the pads on correctly?
the inside and outside pads are different* and while they will fit on either way, if you get them backwards you'll end up with a spongy pedal...

*those little posts on the back of the pads are different, see below

Mike97gt · Feb 14, 2009

you never should have to bleed the system if it was not opened..

what i suggest is to take the brakes apart and make sure everything moves freely and the pads are not installed backwards.

BTW are these new rotors? the shuddering could be warped rotors.. did it do this with the old pads.

2003_GT · Feb 15, 2009

The rotors are the same ones that i used with the old pads... And i im posotive i installed thd pads in correctly i refrenced the old ones to know witch one to install on what side

Pearl02 · Feb 15, 2009

I had the same thing happen when I changed rotors and pads on my car. I've done brakes plenty of times and I've never had this problem. Don't bleed the brakes. I just drove my car and work the brakes as normally as possible. Just keep working the brake pedal. It took a little bit but the brakes came back. This one really puzzled me. Don't panic. Give it a try. Just be careful. Pearl02.

lvmustanggt · Feb 15, 2009

mransr said:
are the pads on correctly?
the inside and outside pads are different* and while they will fit on either way, if you get them backwards you'll end up with a spongy pedal...

*those little posts on the back of the pads are different, see below

I would like to know , white is the pad that should go to the caliper piston side ? little post on the middle or far ?

n0v8or · Feb 16, 2009

A couple of questions:
Does the vibration/shake occur ONLY when the brakes are applied?
Does it persist for a short time after the brake pedal is released?
When driving at a steady ~10 miles per hour, with the brakes lightly applied, does the change in apparent speed ("stop & go thing") occur about 2 times per second?
Do you feel the vibration in the pedal, in the chassis, or both?

If the answer to the 1st 3 questions is Yes, a common cause is an area of greater or lesser friction on a rotor. This can happen when a rotor becomes partially contaminated with oil or grease, or from contaminants transferred from pads-to-rotor, perhaps because the new pads were not bedded-in properly.

Pnyxprz02 · Feb 16, 2009

Brake vibrations....

Hey sorry to hear about the brake problem. Im really not trying to be a smart ass or insult you. But Just wondering if you had the rotors turned before you put the new pads on. It'll give you that same vibration if the rotor and brake pad doesnt have a completely smooth surface to mate with. Again i just wanted to make sure since you reused the old rotor . I hope that helps.

Pnyxprz

:Track:

Mustang5L5 · Feb 16, 2009

Did you correctly torque the wheels back on tightly when you finished?

twogts4us · Feb 16, 2009

Pnyxprz02 said:
Hey sorry to hear about the brake problem. Im really not trying to be a smart ass or insult you. But Just wondering if you had the rotors turned before you put the new pads on. It'll give you that same vibration if the rotor and brake pad doesnt have a completely smooth surface to mate with. Again i just wanted to make sure since you reused the old rotor . I hope that helps.

Pnyxprz

:Track:

That's my question as well - did you turn the rotors???

2003_GT · Feb 17, 2009

n0v8or said:
A couple of questions:
Does the vibration/shake occur ONLY when the brakes are applied?
Does it persist for a short time after the brake pedal is released?
When driving at a steady ~10 miles per hour, with the brakes lightly applied, does the change in apparent speed ("stop & go thing") occur about 2 times per second?
Do you feel the vibration in the pedal, in the chassis, or both?

If the answer to the 1st 3 questions is Yes, a common cause is an area of greater or lesser friction on a rotor. This can happen when a rotor becomes partially contaminated with oil or grease, or from contaminants transferred from pads-to-rotor, perhaps because the new pads were not bedded-in properly.

1. Yes the vibration occur ONLY when i apply the brakes and immediatly goes away when i release them
2.The "stop and go thing"occurs mostly when im going atleast over 35mph anything less its hardly noticible, but when it does happen it gets faster as the car slows down
3.Well the the steering wheel starts to move side to side pretty fast but the car still goes straight, it feels more as if i was applying and releasing the brakes very fast (which im not lol)

2003_GT · Feb 17, 2009

Pnyxprz02 said:
Hey sorry to hear about the brake problem. Im really not trying to be a smart ass or insult you. But Just wondering if you had the rotors turned before you put the new pads on. It'll give you that same vibration if the rotor and brake pad doesnt have a completely smooth surface to mate with. Again i just wanted to make sure since you reused the old rotor . I hope that helps.

Pnyxprz

:Track:

Whats "turning the rotors" mean exaclty

Mustang5L5 · Feb 17, 2009

2003_GT said:
Whats "turning the rotors" mean exaclty

Resurface the rotors by shaving a small amount of material off the face to remove pad friction material deposits and unevenness

2003_GT · Feb 17, 2009

Mustang5L5 said:
Resurface the rotors by shaving a small amount of material off the face to remove pad friction material deposits and unevenness

How do i do this??? Do i need to take it to a shop or can i do it at home

Mustang5L5 · Feb 17, 2009

Must be done on a brake lathe so you will need to take them to somewhere that turns rotors.

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