Seville brake upgrade (JL9)
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Seville brake upgrade (JL9) in Past Cadillac Vehicle Discussion; 10 points to the first to spot the differences. More pics later....
  1. #1
    MoistCabbage's Avatar
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    Seville brake upgrade (JL9)

    10 points to the first to spot the differences.

    More pics later.


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    Ranger's Avatar
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    Re: Seville brake upgrade (JL9)

    There's 3 extra holes in the rotor hat.

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    MoistCabbage's Avatar
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    And?

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    Re: Seville brake upgrade (JL9)

    And they are counter sunk.

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    Re: Seville brake upgrade (JL9)

    dual piston calipers -

    did you get them off a Buick?

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    MoistCabbage's Avatar
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    Dual piston calipers and .75" larger rotors. RPO code JL9 on V8 Lucerns, some '06+ DTSs, some Impalas, and a few other models.




    Rotor size isn't much different:



    But pad size is significantly larger:



    ^^^You can't see the reason I did the upgrade. Apparently, one side of a caliper was binding. The pads wore very unevenly, and the edge of the pad dug into the rotor. I needed new pads and rotors anyway, and for a little more money I could upgrade a bit.

    Rock auto had "friction ready" AC Delco reman'd calipers for ~ $120 a pair (after core return). They were grey, I gave them a few costs of satin black caliper paint.

    It's a direct bolt on. You need pads, rotors, calipers and caliper brackets. The original brake hose has enough slack to work, the original bolts are compatible as we'll. However, 17" rims are required.

    They need to be bed in, so obviously I haven't got on them hard yet. But first impressions after ~35 miles are a little more initial bite, and a less progressive feel (they bite harder with less pedal pressure/movement). It's not a drastic difference, but definitely noticeable. I like it. More of a direct/sporty pedal feel than over boosted luxury car pedal feel (not that the Seville has an over boosted feel to begin with, but you get the idea).

    I'm curious what they'll feel like with harder application at higher speeds. So far so good though.

    .....The advantage of multi piston calipers isn't clamping force, it's the ability to employ a larger pad. Make a pad too much longer than the caliper piston, and the ends of the backing plates will flex. That not only limits clamping force, but the friction material can actually separate if the backing plate flexes too much. With a single piston caliper, the piston size, since they're circular, is limited by the width of the rotor from hat to edge. With multi piston calipers, smaller pistons are spread out over the length of the pad, allowing it to be much longer.

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    Re: Seville brake upgrade (JL9)

    Another writeup on this change should still be in Cadillac Tech Tips - we had another member do essentially the same thing about 5 years ago.

    When you do some high speed very aggressive stops you'll find that you can engage ABS with less pedal effort.

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    curtc's Avatar
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    I wonder if the upgraded JE5's would work for you guys (larger rotors)? I know 17's will clear the calipers as I use that size wheel in the winter on my JE5 equipped STS. It's just a different caliper bracket AFAIK. JL9 is the base brake option on the 05+ STS.
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    Yeah, I would assume any STS brake would be compatible, as long as the rims are large enough to clear. But I'd be concerned with front to rear brake balance if you went too crazy up front, and did nothing in the rear, and I believe you'd need some custom parking brake cables to make the JE5 or Pontiac GXP rear brakes to work.

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    Re: Seville brake upgrade (JL9)

    I completely missed the dual piston calipers.

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    Oh yeah, I forgot to post these together:



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    Re: Seville brake upgrade (JL9)

    HEY - where's my 10 points?
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    Re: Seville brake upgrade (JL9)

    ~500 miles on the brakes, break in is done and then some. I'm happy I did it, definitely worth the improved pedal feel if nothing else. You can definitely tell there's more stopping power available too, not that that's terribly useful during normal driving (other than emergency stops), but for having fun on back roads or long curvy highway on/off ramps, it's nice to have.

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    Re: Seville brake upgrade (JL9)

    Looks awesome Moist!

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