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Thread: Empi disc brakes

  1. #11
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    Default empi disc brakes

    I will measure them in the six places tomorrow and see what I have. I actually thought .009 wasn't bad but I don't know much about disc brakes. What do you mean by re index . I don't guess it would have anything to do with having the calipers mounted on top of the axle. One of my friends has the same set up with calipers mounted on top and doesn't have any trouble. I don't know.

  2. #12
    7000+ Posts Jack Klarich's Avatar
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    Quote Originally Posted by starrider1946 View Post
    I will measure them in the six places tomorrow and see what I have. I actually thought .009 wasn't bad but I don't know much about disc brakes. What do you mean by re index . I don't guess it would have anything to do with having the calipers mounted on top of the axle. One of my friends has the same set up with calipers mounted on top and doesn't have any trouble. I don't know.
    When I say index, mark on the rotor and 1 stud, that is your starting point for indexing

    Some call it match marking

    It is important with rotating mass like a rotor to put it back on the same as you took it off

    If you mark it and want to move it you will know your original starting point

    Once you mark it move it one stud hole, install the lug nuts and tighten by hand, re measure your run out and compare readings

    You can keep doing this if you want to see if the run out changes, some times it does

    As far as run out, if I see more than .003 I would replace rather than take a chance at trying to machine it

    You can compound the run out very easy if you are not careful

    The run out can come back to rear its ugly head again

    There is a lot more than replacing pads and rotors involved in a quality brake service, unfortunately we all get in a hurry and take short cuts JMO
    Nuff Said," Were Burnin Daylight, Lets Ride"(Sober 31years)
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  3. #13
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    Default empi disc brakes

    How can I check to see if the calipers are square to the rotor. I used the stamped brackets that came with the Empi kit. The calipers look centered to me. I wonder if I should take the calipers off and lightly sand them. The pads seem to touch the rotor all the time. I can roll the wheel over with no resistance. I did ride today and I put on the brakes kind of hard at about 35 and it did make the noise then. Could be described as a grabbing type noise. What would be a good way to clean the pad. Also should the pins that hold the pads be greased a little. I don't guess mounting the calipers on top of the axle would make any difference or would it. Thanks for the comments and suggestions.

  4. #14
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    Clean and lube any moving parts

    If the pins are rusty remove the rust first

    You can lightly sand the pads, you can also chamfer both ends of the pads, this will help the brake dust to fall off

    Piggy back calipers have been around for a while, in MOST apps they work pretty good

    Do NOT use brake cleaner on brake parts, try soapy water followed by a good rinse

    Keep in mind most all disc brakes run with ZERO clearance between pads and rotors, that is( 1 of ) the jobs of the square cut O ring in the calipers
    Nuff Said," Were Burnin Daylight, Lets Ride"(Sober 31years)
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  5. #15
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    Default empi disc brakes

    Jack I am just afraid I am not going to get the .001 or .002 thousandths run out with these Empi rotors. I read that if the rotors are warped I would get a pulsating pedal but i don't have that. I may try the cleaning and chamfer the pads and lubricate the pins which I didn't. They are new so they aren't rusty but they are dry. I wish I could tell if the noise is coming from both sides or just one side. I may also take the mounting bracket off and make sure it is good and clean behind it.

    Can I take the rotor and have them turned? I don't know . I may have to try that also if everything else doesn't work. I may also have to order the cast bracket. They would probably be better. I want to make this work because I have much better brakes. Thanks Jack.

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    John, when you did your run out test did you have lug nuts back on and rotor torqued ?

    This will make a HUGE difference, You can also remove the caliper and do your run out with no pads or caliper hook up, this will give you a base line to tell if your caliper is square to the rotor ( do a before and after reading with a dial indicator)

    Brakes are not very complicated systems, They are VERY resistant to minor changes ( IE) poor castings ( rotors and calipers), low grade pads and hardware, dirt and grease are bad Ju Ju

    Stick with it you will get it
    Nuff Said," Were Burnin Daylight, Lets Ride"(Sober 31years)
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  7. #17
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    Default empi disc brakes

    No I just pulled the wheel off and checked the run out with the caliper still on the rotor. Maybe when I take the calipers off I will check the run out again. Didn't realize the difference it would make.

    That may be why Empi sells the cast mounting bracket. They know the stamped one isn't good. I wonder if I should go ahead and order a set and put them on while I have the calipers off. I think they are around 80.00 dollars or so. I am going to check. Thanks again.

  8. #18
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    Quote Originally Posted by starrider1946 View Post
    No I just pulled the wheel off and checked the run out with the caliper still on the rotor. Maybe when I take the calipers off I will check the run out again. Didn't realize the difference it would make.

    That may be why Empi sells the cast mounting bracket. They know the stamped one isn't good. I wonder if I should go ahead and order a set and put them on while I have the calipers off. I think they are around 80.00 dollars or so. I am going to check. Thanks again.
    After you re do the run out you may find the run out is NOT a problem

    The mounting bracket surely could cause a binding brake and noise

    I hope you get it figured out

    I will check back to see if I can help you some more

    I think you have a good approach now
    Nuff Said," Were Burnin Daylight, Lets Ride"(Sober 31years)
    Current ride : 17 FREEWHEELER M8, Power Vision tuner, DK Customs Outlaw air cleaner, modified by me head breather vent with drain, Gutted stock mufflers, (RJS Originals) rear wheel discs , (RJS Originals) custom windshield lower panel, Mighty Mites Love Jugs fans by Papa Zook

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