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Rear Brake Rotor Replacement
 
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Pelican Technical Article:

Rear Brake Rotor Replacement

Steve Vernon

Time:

3 hours3 hrs

Tab:

$80 to $200

Talent:

***

Tools:

19mm, Philips head screwdriver, hammer, floor jack, jack stands, wheel chocks, safety glasses, lug wrench, torque wrench

Applicable Models:

Porsche 944 Turbo (1986-89)

Parts Required:

Rotors

Hot Tip:

make sure the flange is clean

Performance Gain:

Car stops better

Complementary Modification:

Replace brake pads

Brakes are the most important system on your vehicle and should be checked regularly for the state of wear and tear and potential damage to the system. It is surprising how many people never look at the condition of their brakes. A simple visual inspection may be all that's needed to fend off expensive repairs. In general, you should inspect your brake pads and rotors about every 25,000 miles, and replace the rotors if there are any signs of cracks, glazing deep grooves or excessive wear. In reality, most people don't inspect their rotors or pads and usually wait until they see the little brake-warning lamp appear on the dashboard. It's a wise idea to replace the pads, and inspect your discs as soon as you see that warning lamp go on. If you ignore the warning lamp, you may indeed get to the point of metal on metal contact, where the metal backing of the pads are contacting the brake discs. Using the brakes during this condition will not only give you inadequate braking, but will also begin to wear grooves in your brake discs. Once the discs are grooved, they are damaged, and there is often no way to repair them. Resurfacing will sometimes work, but often the groove cut will be deeper than is allowed by OEM specifications. If you have drilled or slotted rotors on your vehicle you cannot resurface the rotor, so a visual inspection once a year is a good idea.

First thing you need to do is get the car up on jack stands and remove the rear wheels removed as well as remove the brake pads. Please refer to our articles on these procedures for more information.

You will need to remove the brake sensor (yellow arrow) and pads (red arrow) to replace the rotors on the rear of the Porsche 944 and 951.
Figure 1

You will need to remove the brake sensor (yellow arrow) and pads (red arrow) to replace the rotors on the rear of the Porsche 944 and 951. Please see our article on this procedure for additional help.

Set the parking brake and loosen or remove the two Philips head screws that hold the rotor to the flange (red arrows).
Figure 2

Set the parking brake and loosen or remove the two Philips head screws that hold the rotor to the flange (red arrows). If you live in a four-season climate there is a good chance you will need to use an impact screwdriver to loosen the screws.

If the rotor will not spin freely you may need to release the parking brake pads on the inside of the rotor.
Figure 3

If the rotor will not spin freely you may need to release the parking brake pads on the inside of the rotor. You will not be able to remove the rotor if the parking shoes inside the rotor are making contact with it. To loosen the parking brake pads, turn the rotor until the access hole is on the top and you can insert a flathead screwdriver into the hole and turn the adjusting wheel until the rotor turns freely.

Unlike the front calipers that are attached to the hard line by a flexible brake line, the calipers on the rear are attached with a hard line.
Figure 4

Unlike the front calipers that are attached to the hard line by a flexible brake line, the calipers on the rear are attached with a hard line. You need to unclip the hard line (red arrow) to the mounting points and remove the caliper carefully so as to not bend the brake line.

Use a 19mm socket and remove the two caliper mounting bolts (red arrows).
Figure 5

Use a 19mm socket and remove the two caliper mounting bolts (red arrows).

Carefully remove the caliper from the rotor and hang it so it does not stress the brake line (red arrow).
Figure 6

Carefully remove the caliper from the rotor and hang it so it does not stress the brake line (red arrow).

If the parking brake is loose and the retaining screws are removed from the rotor and it will still not come off the flange, you can try tapping the bell of the rotor (red arrow) with a mallet.
Figure 7

If the parking brake is loose and the retaining screws are removed from the rotor and it will still not come off the flange, you can try tapping the bell of the rotor (red arrow) with a mallet. Once it is free pull it straight off the rotor. Use care as it is heavy.

Make sure to clean the flange so that it is clean and flat for the new rotor.
Figure 8

Make sure to clean the flange so that it is clean and flat for the new rotor. Installation is the reverse of removal.


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