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BMW E88 Caliper Rebuild Kits

BMW E88 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 (E88) 1-series Convertible 2008+. Reset your chassis
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Front Caliper Piston Upgrade - E82 135i 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.
StopTech
Part #: ST-135-UPGRADE
Price: $399.00 (USD) 
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ECS Performance Caliper Guide Bushing Set - Most Models

This caliper bushing kit will eliminate flex caused by weak rubber caliper bushings. As the brake pedal is pressed the caliper grabs the rotor and twists on its mounting bushings. The rubber bushings allow the caliper to deflect and twist which affects pedal feel and results in uneven pad wear. These solid brass bushings will not twist or deflect so your calipers can squeeze the pads evenly on both sides of the rotor (sort of like what multi-piston big brakes do). This will give you much longer pad life and a more consistent pedal feel. This is the most complete kit we have ever sold with stainless steel caliper slide bolts, o-rings, and new dust boots. Unlike other kits, these bushings are pressed into the caliper and will not shift or slide on their own.

Installation is straightforward: remove the old rubber bushings and press in the new brass bushings (we recommend special tool 003326ECS03). High temp caliper grease or anti-seize is required. The new bushings include an inner o-ring that helps trap grease on the slide bolt, reducing friction and wear.

***Click here for installation instructions*** 

***Click here for the installation tool***

For most models with floating calipers. Fits the rear of E90/2 and E60, but for the front you'll need the kit found here. Does not fit E30 models with Girling calipers, but is compatible with Ate calipers. 

ECS
Part #: 003326ECS01
Price: $102.95 (USD) 
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Rear Brake Caliper Rebuild Kit - E82 135i 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.
Genuine BMW
Part #: 34216780515
Price: $15.27 (USD) 
$18.12 (16% off MSRP)
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Stainless Caliper Guide Bolt (42mm Length)

For vehicles with standard front brake calipers
Stainless Caliper Guide Bolt (42mm Length)

The caliper sliding bolts are one of the most overlooked wear items in your braking system. Subjected to constant motion and often without adequate lubrication the guide bolts see a lot of wear and tear. Factory BMW caliper guide bolts are very expensive from the dealer - these 304 stainless steel bolts are less than half the price and provide outstanding resistance to corrosion and wear. They are manufacturered with tighter tolerances than the factory bolts too.

Price is per bolt unless noted (2 required per caliper).

Enter your vehicle info for specific fitment information.

ECS
Part #: 34111157041KT5
Price: $9.95 (USD) 
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ECS Performance Brake Caliper Guide Bushing Installation Tool Set

Installs bushings straight and true with minimal effort. Includes tools for both iron and aluminum calipers. Purchase only one tool set for your entire caliper guide bushing upgrade - tools are not one time use.

 

***Click here for installation instructions*** 

 

ECS
Part #: 003326ECS03
Price: $21.95 (USD) 
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Front Brake Caliper Rebuild Kit - E82 135i 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.
Genuine BMW
Part #: 34116780507
Price: $12.87 (USD) 
$14.16
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Rear Caliper Anti-Rattle Clip - E36 E46 Z3 Z4 E82 E9X 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
ATE
Part #: 34211157046
Price: $3.80 (USD) 
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StopTech Caliper Piston Rebuild Kits

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 #

3611.7026143.99026K

3813.4528143.99028K

4015.2030143.99030K

4216.9532143.99032K

4418.7034143.99034K

4620.4536143.99036K

4822.2038143.99038K

5023.9540143.99040K

5225.7042143.99042K

5427.4544143.99044K

5629.3046143.99046K


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.

StopTech
Part #: TMS213589DK
Price: $25.00 (USD) 
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Caliper Bushing Upgrade Kit (CBMW1)

This kit will eliminate caliper twisting caused by rubber guide pin bushings. This kit, consisting of precision guide pins and machined brass guide bushings will allow your calipers to squeeze evenly on both sides of the brake rotor, just like expensive multi-piston big brake kits. This will result in much longer pad life and more consistent brake system feel. These are a must if you race your BMW. This kit is SCCA and BMW CCA Club Racing approved. This kit fits both the front or rear calipers (but sold per axle). The ideal set-up is to run both front and rear on your car. Installation is quite simple. Does not fit E30 318/325 with Girling calipers nor E24 M6/E28 M5.

*For the rear calipers only of E9X 335i and E9X M3 models*

ATE
Part #: 34111157038
Price: $59.95 (USD) 
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