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Pelican Technical Article:

Replacing Rear Parking Brake Pads

Mike Holloway

Time:

1 hour1 hr

Tab:

$50 to $150

Talent:

**

Tools:

14mm wrench, 19mm socket wrench, needle nose pliers, 11mm socket wrench, breaker bar, flathead screwdriver, bent nose needle nose pliers, floor jack, jack stands, wheel chocks, safety glasses, torque wrench, lug wrench, floor jack, jack stands, wheel chocks, safety glasses, lug wrench, torque wrench, empty receptacle for catching brake fluid

Applicable Models:

Mercedes-Benz R107 (1972-89)

Parts Required:

Rear parking brake pads

Hot Tip:

Wash the wheel down or vacuum to remove dust

Performance Gain:

Better stopping in park or emergency situations

Complementary Modification:

Change brake fluid, change brake pads

The parking brake pads can wear with time. In order to inspect and replace the parking brake pads, the rotors and calipers must first be removed. All 450SL models use fixed calipers on the rear brakes. Some rear brake calipers are installed on vehicles where the axle shaft is supported on grooved ball bearings. Calipers with a compensating feature may be installed on axles with grooved ball bearings or self-aligning bearings. 

After removing the caliper, spray a penetrating release agent to free the rotor from the hub. Refer to our articles on removing the calipers and removing the rotors for more information. Washing the rotor with an evaporating cleaner or at least water on the parts before disassembly will reduce dust. This will make the job a lot easier and safer.  Once the rotor is removed the parking brakes will be visible. 

Make sure the car is supported by jack stands and the wheels are chocked. Refer to our article on safely jacking up and supporting your 450SL for more information.

Before you do any work on your car it is important that you wear safety glasses, work gloves and dispose of all fluids in a safe manner.  If you have to jack up your car, make sure to use jack stands and chock your wheels as well as applying the parking brake. Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.  Always wear eye and hand protection.


Using the 14mm socket wrench, remove the four bolts holding the caliper together.
Figure 1

Using the 14mm socket wrench, remove the four bolts holding the caliper together.

Remove the front of the caliper from the rotor.
Figure 2

Remove the front of the caliper from the rotor.

Using the 14mm line wrench to take off the brake line.
Figure 3

Using the 14mm line wrench to take off the brake line. There will be brake fluid coming out of the line.

When you have removed the brake line, using the 19mm socket and the breaker bar, remove the first bolt holding it to the rotor.
Figure 4

When you have removed the brake line, using the 19mm socket and the breaker bar, remove the first bolt holding it to the rotor. Make sure you have a receptacle to catch brake fluid as it drains from the line. The brake line will have to be bled of air upon reassembly. 

Using the 19mm socket and the breaker bar, remove the second bolt holding it to the rotor.
Figure 5

Using the 19mm socket and the breaker bar, remove the second bolt holding it to the rotor. This will allow the caliper to come off.

Remove the brake disc from the rear axle shaft flange.
Figure 6

Remove the brake disc from the rear axle shaft flange. Jammed brake discs can be loosened from the axle shaft flanges by light taps with a hammer. Be sure that the parking brake is fully released.

Look at the rotor for wear patterns.
Figure 7

Look at the rotor for wear patterns.

The parking brake pads are now visible.
Figure 8

The parking brake pads are now visible. The parking brake should be released.

Using a flathead screw driver, turn the pad adjuster screw to loosen the tension on the springs.
Figure 9

Using a flathead screw driver, turn the pad adjuster screw to loosen the tension on the springs.

Separate the adjustment screw from its housing.
Figure 10

Separate the adjustment screw from its housing. This should release any tension on the springs.

Using bent nose needle nose pliers, remove the adjustment spring.
Figure 11

Using bent nose needle nose pliers, remove the adjustment spring.

Using bent nose needle nose pliers, remove the holding spring located at the bottom of the wheel.
Figure 12

Using bent nose needle nose pliers, remove the holding spring located at the bottom of the wheel.

There are springs holding the pads in place.
Figure 13

There are springs holding the pads in place. These springs can be released by pressing down and turning until the hook fits through the hole.

Here is what the spring looks like when it is free from the wheel.
Figure 14

Here is what the spring looks like when it is free from the wheel.

Inspect the pads for wear and corrosion.
Figure 15

Inspect the pads for wear and corrosion. Reassembly is the reverse of removal.

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