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    BMW E39 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 (E39) 5-Series 1996-2003. Reset your chassis
    For accurate results, specify your year and model below.
    As Used on Project E36 M3
    A kit to rebuild one front caliper. Always replace in pairs.

    Part #: 34111157037
    Price: $24.95 (USD) 
    Rebuild kit to replace the seals and dust boots on one rear caliper (see application list).

    1999-2003 E39 M5
    2001-2006 E46 M3 **except ZCP Competition Package**
    1999-2006 E53 X5, all
    Part #: 34211166238
    Price: $19.95 (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)