Parts Catalog Accessories Catalog Tech Info Tech Forums
 
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
Parking Brake Adjustment
 
Bookmark and Share

Pelican Technical Article:

Parking Brake Adjustment

Jared Fenton

Time:

2 hours2 hrs

Tab:

$0 to $100

Talent:

***

Tools:

Screwdrivers, needle-nose pliers

Applicable Models:

Porsche 955 Cayenne (2004-10)
Porsche 955 Cayenne GTS (2008-10)
Porsche 955 Cayenne S (2003-10)
Porsche 955 Cayenne Turbo (2003-10)
Porsche 955 Cayenne Turbo S (2006-10)

Parts Required:

New parking brake shoes

Hot Tip:

Follow the directions exactly

Performance Gain:

Car no longer rolls down steep hills

Complementary Modification:

Replace pads/rotors.

Over the years, the parking brake shoes on your Cayenne can wear and lose effectiveness. Adjusting the parking brake assembly on each rear wheel is a relatively simple procedure, requiring removal of both rear wheels.

Make sure that the parking brake lever is released and the car is in neutral. Using a screwdriver, push back slightly on the brake pads until the brake disc is allowed to turn freely. Be careful to check the fluid level in the master cylinder reservoir, as pushing the pads back will make the fluid level rise and may cause it to overflow.

Once the brake disc can be moved easily, move to the parking brake pedal inside the car. You'll want to check the pedal travel first. Begin by measuring the distance from the left seat rail to the lower edge of the pedal. Press the pedal in 40mm (+/- 5mm). Return to the rotor and see if it turns without grinding. If so, release the brake pedal and press it in 75mm (+/- 5mm). If the rotor can still turn, the parking brake must be adjusted.

The adjustment of the parking brake shoes is accomplished by turning a small gear with a screwdriver. Unfortunately, this sprocket can only be reached through a small hole in the brake rotor. Remove each rear wheel and the 5mm triple square plug that covers the access hole. Rotate the rotor so that the hole is at 9 o'clock on the right side of the vehicle and 3 o'clock on the left side of the vehicle.

Reaching in through the hole, use a screwdriver to rotate the cog until the parking brake shoe is tight and the rotor can no longer be rotated. You will have to play with the mechanism a little bit to see if you need to turn the cog left or right to tighten. If you are turning the sprocket a lot, and the brake disc isn't tightening up, then you are probably turning it the in the wrong direction. Repeat this procedure for the opposite side of the car. After you have the sprockets adjusted so that the brake shoes have just pressed up against the inside of the disc, and you can no longer turn the disc, back them off six clicks, making sure that the disc can spin after the 6th click.

Now move back to the cockpit of the car, press and release the parking brake several times to help seat the shoes. Now, release the lever and verify that the wheels turn freely. The brake discs should be free to rotate with the pedal in the released position, but fully locked by the time that the pedal is pressed in at 75mm as specified above.

When you are finished, recheck the master cylinder reservoir, and also step on the brake pedal a few times in order to make sure that the pistons have repositioned themselves properly against the brake pads. Also verify that the parking brake lamp on the dashboard illuminates as soon as the brake pedal is pushed (there's a switch near the base of the pedal that triggers this lamp).

If you have followed the adjustment procedure and the parking brake still does not work correctly, you may need to replace the brake shoes. Replacing the parking brake shoes first requires you to remove the rear caliper and rotor. See our articles on replacing rear brake pads and rotors for more information.

Once you have removed the rear brake rotor, you'll need to start disassembling the parking brake.
Figure 1

Once you have removed the rear brake rotor, you'll need to start disassembling the parking brake. Begin by rotating the parking brake adjuster in the direction of the green arrow shown here. The green arrow shows the direction to relieve tension on the brake shoes. The yellow arrow shows the direction to increase tension. Back the adjuster off all the way to help you remove the springs on the shoes.

Shown here is the adjuster with the tension fully backed off (yellow arrow).
Figure 2

Shown here is the adjuster with the tension fully backed off (yellow arrow). Now remove the ends of the retaining spring (green arrows). You'll want to use a pair of needle-nose pliers and use caution as the springs are under very high tension.

Now remove the spring from the opposite side of the parking brake (green arrows).
Figure 3

Now remove the spring from the opposite side of the parking brake (green arrows). Again, use caution when removing the spring. Take note of the orientation of the clevis assembly between the two shoes.

Remove the brake shoe retaining pin from the bottom (green arrow).
Figure 4

Remove the brake shoe retaining pin from the bottom (green arrow). You'll need to push the pin in with the screwdriver and rotate it 90 degrees to release it from the backing plate. At this point, the lower brake show will be detached from the backing plate. The clevis assembly for the cable will also fall off.

Now remove the top retaining pin and remove the brake shoe (green arrow).
Figure 5

Now remove the top retaining pin and remove the brake shoe (green arrow).

Shown here is the end of the brake show retaining pin (green arrow).
Figure 6

Shown here is the end of the brake show retaining pin (green arrow). You can see here how the pin fits into the backing plate (yellow arrow). When installing the new shoes, you'll need to line up the end of the pin with the hole and then rotate it 90 degrees to lock the shoe in place.

When installing the new brake shoes, first take note of the orientation of the cable clevis (green arrow).
Figure 7

When installing the new brake shoes, first take note of the orientation of the cable clevis (green arrow). You'll need to make sure that the hook fits over the cable end as show here. Now install the new brake shoes and secure each in place with the retaining pins. Once in place, install the adjuster and then the retaining springs. Note that the longer spring fits over the adjuster side, while the shorter spring fits over the clevis side. It will take some effort to stretch the spring ends into the holes on each shoe. Use caution.

Now re-fit the brake rotor, make sure the car is in neutral and follow the directions for checking the pedal travel.
Figure 8

Now re-fit the brake rotor, make sure the car is in neutral and follow the directions for checking the pedal travel. If all checks out, place a screwdriver through the access hole. You'll want to tension the adjuster and check the movement of the rotor. Keep tensioning until you cannot turn the rotor anymore. At this point, back the adjuster off 6 clicks and check that the rotor turns. Some grinding is OK. Now refit the inspection cover and you're done.

Bookmark and Share

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Project/Wish List]
  [Privacy Statement]  [Contact Us] [About Us] [Shipping] [Careers]

Copyright © Pelican Parts Inc. -    DMCA Registered Agent Contact Page

Page last updated: Mon 12/5/2016 02:32:17 AM