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    BMW E82 Caliper Rebuild Kits

    Brake caliper piston seals are there to maintain brake system pressure and prevent fluid from leaking out from inside the caliper. When a seal goes bad or becomes damaged the brakes lose pressure, leading to a soft brake pedal, sticking caliper, or even a total loss of your brakes. Brake calipers also need periodic rebuilds because the inner piston can seize from rust. With a piston stuck in the retracted position, the brakes are no longer functioning on that wheel. If the caliper is stuck in the extended position it's putting clamping force on your brakes - dragging the brakes, front wheel vibrations, pulling to one side, excessive brake dust and heat, and potentially even a brake pad fire. For cars that see significant track use, regular caliper rebuilds are essential because higher temps lead to rubber seal failures sooner.

    Rebuilding your calipers should be part of a regular brake overhaul. The calipers must be removed from the car and disassembled. It's not a particularly difficult job to do but is messy and takes some expertise so that you don't ruin the piston or new seals. Rebuilding calipers is more cost effective than buying replacement calipers. However you service the calipers don't prolong their maintenance until it's too late!
    You're currently viewing parts for your (E82) 1-series 2008+ Coupe and Convertible. Reset your chassis
    For accurate results, specify your year and model below.
    A set of dust boots to rebuild the 6-piston Brembo front calipers on the E82/E88 135i. This is also the correct seal kit to rebuild the BMW 6-piston Performance calipers fitted as an upgrade to many BMW models. One kit is enough for one caliper.

    This item fits the following BMWs:
    2008+ E82 BMW 135i
    Any other BMW model that has been upgraded with the BMW 6-piston Performance Brake kit.
    Part #: 34116780507
    Price: $14.95 (USD) 
    The Brembo 6-piston brakes on the 135i promised a major step forward in BMW braking performance. But if you have driven or tracked your 135i hard you have probably found that the calipers are not impervious to issues. While great on the street, numerous owners have reported problems from the track. First and foremost, the caliper pistons have a ceramic buffer between the piston and the brake pad which can easily deteriorate and crumble under the extreme heat from race pads and the track. BMW will sell replacement seals but not the pistons separately.

    This set of aluminum pistons and seals are from the StopTech line of calipers and are a direct replacement for the Brembo pistons in the 135i. If you want an upgrade to seals and pistons with greater durability than the originals, this is your ideal kit. StopTech has been the official brake supplier for our racing team since 2003, ensuring that these parts will stand up to the harshest track environments (periodic seal replacement and rebuilding still recommended). For greater braking performance you should also run brake cooling ducts and higher temp brake fluid.

    Price is for a full set with enough pistons and seals to do both front calipers. If you have already done this upgrade and just need the seals, choose that option below.

    This item fits the following BMWs:
    2008+ E82 BMW 135i
    Any other BMW model that has been upgraded with the BMW Performance Brake kit.
    Part #: ST-135-UPGRADE
    Price: $450.00 (USD) 
    A set of seals to rebuild the Brembo rear calipers on the E82/E88 135i. This is also the correct seal kit to rebuild the BMW Performance calipers fitted as an upgrade to many BMW models. One kit is enough for one caliper.

    This item fits the following BMWs:
    2008+ E82 BMW 135i
    Any other BMW model that has been upgraded with the BMW 2-piston Performance Brake kit.
    Part #: 34216780515
    Price: $16.95 (USD) 
    The brake pad anti-rattle clip snaps into the caliper and helps to keep tension on the pads. This tension helps to prevent the brake pads from vibrating ensures quiet operation of the brakes. Can be used for left or right side. Sold individually.

    This item fits the following BMWs:
    2008+ E82 BMW 128i
    1992-1998 E36 BMW 318i 318is 318ti 318ic 323is 323ic 325i 325is 325ic 328i 328is 328ic
    1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci
    2006-2011 E90 BMW 325i 325xi 328i 328xi 328i xDrive - Sedan
    2006-2012 E91 BMW 325xi 328i 328xi 328i xDrive - Wagon
    2007-2013 E92 BMW 328i 328xi 328i xDrive - Coupe
    2007-2013 E93 BMW 328i - Convertible
    2013+ E84 BMW X1 sDrive28i X1 xDrive28i
    1997-2002 Z3 BMW Z3 1.9
    2003-2008 E85 BMW Z4 2.5i Z4 3.0i Z4 3.0si
    Part #: 34211157046
    Price: $9.95 (USD) 
    Stoptech Big Brake calipers are designed to be serviced and rebuilt just like any factory caliper. The pistons will probably last the life of the car but the seals can become brittle from extreme heat or extreme cold. Sometimes they just get damaged from debris. For racing environments it's best to rebuild the calipers often (maybe even several times a year). At least you should always have spare caliper seals on hand.

    These are the genuine Stoptech caliper seals (dust boots and pressure seals). We sell these to service a PAIR of pistons (1 boot and 1 seal per piston). You will need to measure your existing pistons or seals to order the correct rebuild kits. Sorry, there are too many variables to tell you which pistons you have with only your car info. It's easy to measure and you don't have to remove the pistons from the calipers. Stoptech pistons are metric sized and in 2mm increments. Use the chart below to match your measurments to a rebuild kit.

    There are a few ways to determine which caliper seals you need. You can measure from the overall outside diameter of the dust boot (A); the inside diameter of the piston (B); or the outside diameter of the piston body (not the tip protruding from the seal!) (C). If measuring the piston body the whole piston has to come out of the caliper housing. Just measuring the tip will give a false measurement. Remember to measure each of your pistons as piston sizes can vary even within the same caliper. Click the image at left for a larger version.

    Use the table below to determine which Stoptech rebuild kit you need:
    Outer Boot
    Diameter, "A"
    Piston Inner
    Diameter, "B"
    Piston Outer
    Diameter, "C"
    Stoptech Kit #
    36 11.70 26 143.99026K
    38 13.45 28 143.99028K
    40 15.20 30 143.99030K
    42 16.95 32 143.99032K
    44 18.70 34 143.99034K
    46 20.45 36 143.99036K
    48 22.20 38 143.99038K
    50 23.95 40 143.99040K
    52 25.70 42 143.99042K
    54 27.45 44 143.99044K
    56 29.30 46 143.99046K

    We sell rebuild kits for a PAIR of pistons - 1 seal and 1 boot per piston. For example -
    For a 4-piston caliper you only need to order 2 rebuild kits.
    For a 6-piston caliper you only need to order 3 rebuild kits.
    But make sure you measure each piston!

    These rebuild kits fit with StopTech caliper pistons only. Sorry, returns are not accepted for opened piston seal kits.
    Price: $25.00 (USD)