this tech article we will discuss replacement of the rear brake pads on the
E36 BMW 3 Series. This article covers all BMW 3 series from 1992-99. While
this tech article is specific to the E36, it applies to most other BMW
models with floating calipers as well.
your brakes starting to squeak? Has the ďbrake liningsĒ light come on?
These are indications that the brakes need service. The good news is that
replacing your brakes is a relatively easy procedure that you ca perform in
your own garage in just a few hours.
loosen the lug bolts but do not remove them. Just loosen them, then
snug them back up. Next, jack up the car in a safe
manner. Itís a good idea to use Wayneís article here for
reference on safe ways of jacking up the car. Also be sure to chock the
front wheels. This keeps the car from rolling away and possibly crushing you
the car is up in the air, remove the wheels and you will see the disc brake
assembly. Look at the backside of the caliper. Youíll see an electrical
connection coming out of the passenger side rear caliper. This is the wire
harness for the rear brake wear sensor. Unplug this sensor where it plugs
into the harness.
remove the brake pad retaining spring on the front of the caliper. Use a
screwdriver to pry this spring off. Now look at the back of the caliper. You
will notice two plastic inserts inside two rubber grommets at the top and
the bottom of the caliper. You will need to remove these in order to
continue. Use a screwdriver to pry them out. Directly beneath these inserts
are two 7mm Allen bolts. Use a 7mm Allen key to remove these bolts. Once
removed, you will be able to pull the caliper off the rotor.
take a look at the old brake pads. Compare these to the new pads. Notice the
brake wear sensor on the old pads. This will give you a good idea of how the
sensor works. Essentially when the pads wear down to a certain point, it
wears away the outside cover of the sensor, eventually wearing it down
enough to the point where the metal strip inside contacts the rotor, and
completes the electrical circuit, and the light on the dash illuminates. We
will be replacing these sensors as well.
next step is to remove the brake rotors. You need to remove them in order to
have them surfaced. Re-surfacing brake rotors is important. Failure to do so
can cause the brakes to not seat properly or even overheat. Re-surfacing
insures that the new pads will seat properly. Any decent auto parts shop can
re-surface your brake rotors for usually around $5 a rotor.
in mind, however that brake rotors, by law, can only be re-surfaced a
certain amount of times before you exceed the amount of material that can be
removed. This is done for safety reasons. If you have exceeded the amount of
material that can be removed, youíll have to purchase new rotors.
order to remove the brake rotors, remove
the Allen head bolt that holds the rotor to the hub. You may have some
trouble removing these without stripping the bolt, so I recommend that you
soak the bolt in a good penetrant spray for a few hours prior to loosening
the bolt. This will help prevent against stripped or damaged threads, and a
potential nightmare that will send you screaming over the edge. (Ask me how
I know thisÖ.)
next step to remove the rotors is to remove the brake caliper bracket that
sits on the back of the hub. You will notice two large bolts holding it to
the hub. Remove these two bolts, and remove the caliper bracket. The brake
rotor should now come free. If the rotors are stuck and do not seem to come
off, try taking the parking brake off. The rotor should come right off. Once
you get the rotor off, youíll see why.
behind the rotor is the parking brake assembly. When you pull the e-brake
handle, it drives the two brake pads outward, against the inside of the
brake rotor, which locks it and prevents the car from rolling away.
you have the brake rotors removed, take them to the auto parts store,
machine shop, etc.. and have them re-surfaced. Obviously, take another car
to the store, as youíll find your brakes donít work with the brake discs
removed from the car.
is a good time to clean everything. Youíll want to use a good quality
brake cleaner to make sure that the calipers and surrounding parts are clean
and free of dirt and grime. Grease on the brake discs can cause brake
the brake discs surfaced, you can now start re-installing the components.
Put the surfaced rotors back on
the hubs, and make sure to line up the holes, so that the brake disc
hold-down Allen screw will thread in. Itís a good idea to put a dab of
anti-seize compound on one side of the threads to prevent stripping the next
time you remove the brake discs.
that the rotors are installed, itís time to compress the caliper pistons.
Youíll want to do this in order for the new brake pads to fit. As the old
brake discs wear, the piston gradually moves more and more out of the
caliper, making it impossible for the new pads to fit on without the piston
being pushed back..
order to compress the pistons, first remove the brake fluid reservoir cap,
this will relieve the pressure on the system, and make it easier for you to
push the pistons. Next, use a large C-clamp as shown in the photo, to slowly
push the piston back into the caliper. The caliper pistons should slide back
with a minimal amount of force.
install the new brake wear sensor in place. Keep in mind that there is only
one brake wear sensor on the right rear. The sensor simply clips onto the
edge of the brake pad.
the calipers are compressed, re-install the caliper bracket on the hub and
make sure the bolts are tight. BMW recommends you torque them to 65 ft/lbs.
place the new brake pads on the lower caliper mounting plate as shown.. When
they are in place, carefully place the caliper over the pads. You may notice
a bit of resistance in doing this because of the new springs that hold the
new pads in place. Just use a little force to push the caliper in position,
then install the two Allen head bolts and tighten them. Donít forget to
put the plastic grommets back in place. These grommets prevent grime and
dirt from building up on the bolts, which could eventually cause them to
rust and sieze.
all this is done, re-check everything. You donít want to take chances with
your brakes. Check and then double check that everything is tight.
you are ready to put the wheels
back on. Once they are re-installed and tightened, take the car out and test
the brakes. You should notice that they donít stop very well at first.
This is normal. Youíll need to seat the brake pads in order for them to
work well. Simply drive the car cautiously for roughly 50 or so miles, and
the brake pads will seat into the new rotors. Itís also a good idea to
pump the brake occasionally during this time to get the rotors hot and the
pads seated quicker.
Well, there you have it - it's
really not too difficult at all. If you would like
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