Grooved Rotor

[Marccus]

When changing my front brake pads, I had to replace my left front rotor because it was severely grooved on the inside.

I thought this was due to the extremely worn brake pad.

After only several months, I again found the left front rotor had an extremely deep groove on the inside.

There is no noise when driving, braking, or turning. The car runs straight as an arrow when I let go of the steering wheel and there is no vibration.

I cannot detect anything rubber the rotor when I inspect it visually. :headbang:

What is "grooving" the rotor?

Since the pads are in constant contact with the rotor )even when the brakes are not applied), I assume there must be an uneven pressure on the brake pad from the rotor piston, causing one point to rub ******* the rotor.

Will caliper replacement solve the problem?

Any help would be appreciated.

'89 SHO with 296,000 mi. Original calipers.

 

[Marccus]

Hey ... can anybody make a suggestion on why I am severely grooving the inside of my front left rotor and wearing down the same brake pad much more rapidly than the other three?

PLEASE!!!

 

[andyrightcoast]

Mine does the same exact thing, and I have no idea why either, lol.

 

[SHOtimer]

Well, at your mileage it can be a combination of several different things. Your caliper could be sticking which would cause this. The slider pins could probably use some lubrication, if they aren't lubed properly they won't slide very well and possibly not be letting the caliper return completely to its released position (I would try this first since it only requires grease to figure out if it is your problem or not). Lastly, and probably least likely is that your brake lines could be collapsing not allowing the fluid to completely release from the caliper area. This usually only happens in the rear, but at your mileage anything is possible.

A second thought, did you completely compress the piston in the caliper after the brake job?

I would try greasing up the pins first, and if that doesn't work go to caliper replacement. If that is the problem I would reccomend replacing both front calipers at the same time so they are equal in their performance. If you do indeed have to replace the calipers I personally would replace the lines also, they are rather cheap and at your mileage since you would have to open the system anyway, it would **** two birds with one stone.

Doug

 

[Marccus]

Thanks to all.

I grease everything very thoroughly including the pins. I use Red Line Synthetic CV grease good to 800°F, the highest dropping point of any grease on the market.

Slippery as all ****. It has "red moly" in it as opposed to "black moly". Red line will tell you why "red moly" is better.

I have a feeling it may be the flexible brake hose lines which I intended tr replace, but the lines sent to me by the Tire Rack made by Goodridge have the wrong side thread for the tube fitting, even though they said they would fit my '89 SHO.

You guys are the cat's meow.

 

[Marccus]

A second thought, did you completely compress the piston in the caliper after the brake job?
Doug

No, I didn't completely compress the piston.
:ruhroh: :cry: :headbang: :sh:

I didn't know you had to do this.

 

[LOUDSHO92]

I would probably say you have a bad caliper. The calipers on my Tempo did this on one side. It was becasue the caliper went bad. You probably need new calipers.

 

[SHOtimer]

No, I didn't completely compress the piston.
:ruhroh: :cry: :headbang: :sh:

I didn't know you had to do this.

Well, things like that happen....

If you still have a problem after compressing the piston back I would say pickup some new lines and some rebuilt calipers.

Doug

 

[pete c]

what a POS. Only 300K and 15 years out of a caliper? That just ain't right.

Go to autozone and get a rebuilt. Somewhere around 40 bucks. Probably have to do it again at 600K, so start saving your pennies.

 

[GR8SHO]

Rotors are cheap. Get 2 new ones from a place like Autozone. Get the more expensive ones. $20 a piece IIRC. Replace the pads with Performance Friction carbon metallics. The problem will be solved with that most likely.