1999 Mustang GT Front brake caliper issues - Ford Mustang Forum
 
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post #1 of 11 (permalink) Old 03-13-2011 Thread Starter
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1999 Mustang GT Front brake caliper issues

So heres the deal. I drove the car home after buying it, and everything was fine. Over the winter I put new pads and drilled and slotted rotors on the car. I backed the car out of the garage today to clean and it moved out fine. I used the brakes to stop and put in park in the driveway. I get back in it to go wash the car and I thought I left the parking brake on, but I didnt. It seems to be the front. The rotors appear to have gotten hot unlike the rear which does not look like that. I am just wanting to know if this is something that can be fixed or do I more than likely need to front calipers? The pads I took off it were quite worn down. Am I able to lube the cylinder or something?
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post #2 of 11 (permalink) Old 03-13-2011
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Sorry but your post is a bit confusing... you think the rotors got too hot, and one of the symptoms was early wear on the pads....thats correct?

You said you changed rotors and pads...did this yourself? if so did you use the right tools to compress the pistons? if not compressed properly theres a chance you can deform or crack them. This will surely could make a piston get stuck in the bore, but most surely will also create a leak.

Now...slotted rotors do wear pads faster, and they do tend to CRACK at the slots. Also, when a rotor gets too hot, it could warp.

Advice:
Remove the pads and rotors, have the rotors checked for warping and cracked spots, and if needed, do a resurface.
Don't use pure metallic pads, use more friendly semi-metallic ones, will brake better for everyday use.
Change the brake fluid, your 99 stang probably still has the old fluid in there, and a good chance it has a good amount of water.
Have the shop..or yourself, inspect the pistons and rings. Replacing the rings is a simple process, just make sure the piston gets straight into the bore.

I do love the look and added braking of slotted rotors, but using a high quality brand is a MUST. There are cheap ones that basically are stock rotors that have been drilled...those are CRAP.

Even the quality ones DO CRACK, i had brembos and willwoods and eventually both cracked at the slots, but they lasted a lot and got serious track time.

Rob Hernandez, AFM co-Founder.
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post #3 of 11 (permalink) Old 03-13-2011 Thread Starter
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Yeah I tend to ramble on, sorry! The brakes in question are brand new. I backed out of the garage for the 1st time and it moved fine until I applied the brakes in the driveway. I think they just stuck in that position cause they seemed to drag as I drove up to the car wash.
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post #4 of 11 (permalink) Old 03-13-2011
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Might just need a new brake line. The inside of them can become swollen and not allow the fluid to flow back to the m/c so essentially there's always a little bit of pressure there to cause your brake to drag.


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post #5 of 11 (permalink) Old 03-14-2011
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I would take them back off and see if you can compress the piston back in again with a c clamp. The stock lines are crap and braided are better. I would also change the fluid if it hasn't been in awhile. Shouldn't look black.

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post #6 of 11 (permalink) Old 03-14-2011 Thread Starter
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Thanks all, for the tips! I will try it out and see what happens tonight.
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post #7 of 11 (permalink) Old 03-14-2011
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welcome to the mustang caliper problem. They do not like to sit, they tend to oxidize and the caliper wont retract fully. Its best to pump your brakes a few times when you start the car every cpl weeks during the off months, unless your parked in climate controlled garage.
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post #8 of 11 (permalink) Old 03-28-2011
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I have a 99 GT with the same problem. I park it over the winter months under a tarp (winter here being 6 months long with below freezing weather), without touching it until spring. Unfortunately, now my front calipers are seizing and causing the brakes to drag, making for alot of heat, noise and vibration...not to mention rediculous gas mileage.

Anyways, I am going to try replacing the front calipers this spring, as well as the pads and rotors. What do you guys think?

Also, is there a certain way to compress the pistons on the front calipers?...Last time I just used a 2x4 and two C-clamps, and they were TOUGH to move. Took my friend and I an hour each side.

Thanks!
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post #9 of 11 (permalink) Old 03-30-2011
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Quote:
Originally Posted by hypertensor25 View Post
I have a 99 GT with the same problem. I park it over the winter months under a tarp (winter here being 6 months long with below freezing weather), without touching it until spring. Unfortunately, now my front calipers are seizing and causing the brakes to drag, making for alot of heat, noise and vibration...not to mention rediculous gas mileage.

Anyways, I am going to try replacing the front calipers this spring, as well as the pads and rotors. What do you guys think?

Also, is there a certain way to compress the pistons on the front calipers?...Last time I just used a 2x4 and two C-clamps, and they were TOUGH to move. Took my friend and I an hour each side.

Thanks!

That's all I do as well, minus the wood. I compress them one at a time. As far as them being tough to compress, make sure the cap from the brake fluid reservoir is off. If that doesn't help, then undo the bleeder screw on the caliper. You shouldn't have to do the latter; if you find it necessary to do so then you likely have other problems such as a bad flex line or need a caliper rebuild.


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99redbeauty:

The sliders are often prone to corrosion and then they stick and don't let the caliper slide back properly. They are pretty easy to replace and they don't cost much (although it is annoying to have to replace them). Don't forget to put a little 'brake grease' on the slider pins to keep them from corroding (faster).

HTH,

Chris

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Thanks for the advice, SoCal2V. I figured it's time to replace those calipers....hopefully the brake lines are okay.


Peace!
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