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Front Brake Rotor Replacement
 
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Pelican Technical Article:

Front Brake Rotor Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$30 to $100

Talent:

**

Tools:

10mm, 5mm Allen, breaker bar, large pliers, friend

Applicable Models:

Mercedes-Benz W123 (1977-85)

Parts Required:

Rotors

Hot Tip:

Pre-soak rusted bolts in penetrant oil

Performance Gain:

Car stops better

Complementary Modification:

Flush and bleed brake system

Begin by safely jacking up and supporting the vehicle and removing the front wheels and remove the calipers.
Figure 1

Begin by safely jacking up and supporting the vehicle and removing the front wheels and remove the calipers. Please see our article on jacking up and supporting your W123 along with removing your brake caliper.

Use a large set of pliers or a punch and remove the grease cap from the end of the hub.
Figure 2

Use a large set of pliers or a punch and remove the grease cap from the end of the hub.

Next use a 5mm Allen and loosen the pinch nut on the end of the spindle (red arrow).
Figure 3

Next use a 5mm Allen and loosen the pinch nut on the end of the spindle (red arrow).

Unscrew and remove the pinch nut from the end of the spindle.
Figure 4

Unscrew and remove the pinch nut from the end of the spindle.

Lightly pull the rotor a little forward and remove the outer bearing, if you end up pulling the rotor completely off make sure you catch the bearing so it doesn't hit the ground.
Figure 5

Lightly pull the rotor a little forward and remove the outer bearing, if you end up pulling the rotor completely off make sure you catch the bearing so it doesn't hit the ground.

Remove the hub and rotor from the spindle (red arrow).
Figure 6

Remove the hub and rotor from the spindle (red arrow). Inspect the spindle for any damage, this would include burs, gouges, scratches or heat damage.

You are going to need to remove the five 10mm Allen bolts that attach the rotor to the hub (red arrow).
Figure 7

You are going to need to remove the five 10mm Allen bolts that attach the rotor to the hub (red arrow).

The rotor is attached to the hub with a fair amount of torque and usually some blue Loctite.
Figure 8

The rotor is attached to the hub with a fair amount of torque and usually some blue Loctite. One trick to getting the bolts off is to hit them with some penetrating oil and then attach the hub to the wheel with three bolts. You can either lay the wheel on the floor and have a friend stand on it or position the wheel upright against a wall and break the bolts free that way.

With the bolts removed the rotor will easily separate from the hub.
Figure 9

With the bolts removed the rotor will easily separate from the hub.

Make sure to clean the mounting surface on the hub before installing the new rotor; you want a nice clean and flat mounting surface (red arrow).
Figure 10

Make sure to clean the mounting surface on the hub before installing the new rotor; you want a nice clean and flat mounting surface (red arrow). Installation is the reverse of removal.

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Page last updated: Fri 12/2/2016 03:04:30 AM