b'Skipping or forgoing Service Mode is considered to be ok in certain cases. For example:Removing the rear brakes pads, rotors and reinstalling them (original used parts).Replacing rear brake pads.Replacing rear brake rotors. PORSCHE REAR BRAKE REPAIR PROCEDURESKeep in mind that you skip Service Mode at your own risk. You may end up Retracting the parking brake and placing it in Service Mode is an oftenwith an air gap fault or poorly holding parking brake; then parking brake needed step in rear brake or suspension work on modern European vehicles.shoes air gap will have to be reset. Most times this is a simple procedure performed using a scan tool with OE capabilities, such as the iSCAN sf. Using the scan tool, you retract the parkingIf replacing the parking brake shoes, you have to assume some wear-and-tear. brake to enter Service Mode and, when \x1fnished with the repair on that axle,Possibly some automatic brake shoe adjustment has occurred. So placing the return the brakes to normal function by exiting Service Mode.brakes in Service Mode as well adjusting the air gap on the new shoes is critical. Just be sure to notify your customer of the associated risks of EPB Now I did say this was simple most times, but heres the catch. Some Porschemodule failure with this repair. models from 2010 utilize a 4-wheel disc brake system with a drum integral with the cast iron rear brake rotor on each side. Inside each drum are a pair ofLets take a look at how to enter Service Mode and adjust the parking brake conventional brake shoes which are actuated by an electrical solenoid.shoe air gap when necessary. Models with compound brake rotors, which have an aluminum hub, do not have this parking brake type.Connect your iSCAN sf or equivalent scan tool and use Service Mode to proceed, following the instructions on the tool screen. (In the iSCAN menu When servicing the rear brakes on these models, most times you will have tosystem, brake repair procedures are under the Stability System heading.) place the rear brakes in Service Mode. This can lead to a few issues you should be aware of. Before we get into the procedure itself and when I feel it should Raise and support the be performed or ignored, lets talk about a few examples of what can govehicle safely. wrong \x1frst. Remove the rear wheels.Unbolt each brake caliper 1. You place the parking brake in Service Mode to service the hub or toand hang to the side using replace the rear brake pads, reusing the old rotor. When Service Mode issti\x1e wire.exited, a fault will be set for brake shoe air gap, requiring you to reset the Remove the integrated parking brake shoe air gap. This is the best case scenario.brake rotor / drums. Right side: Rotate the rotor 2. You place the brakes into Service Mode. When exiting Service Mode, a faultso that one wheel bolt hole sets. When you adjust the brake shoe air gap, the fault does not clear due tois at 7 oclock. an internal parking brake (EPB) module fault. This requires replacement and Left side: Rotate the rotor so programming of the module. This is the worst case scenario.that one wheel bolt hole is at 5 oclock. Because of the risk of module failure, most technicians forgo putting the With a screw-driver or brake brakes in Service Mode and perform parking brake service without it. Is thatshoe adjuster tool, reach risky? Maybeinto the drum and rotate the brake shoe adjuster down-As any shop-owner and technician knows, nothing is worse than for you toward by swinging the have to explain a surprise major repair to your customer. You quote the rearscrew-driver handle upward. See the illustration. brake or rear axle work, get the parts, start the work, and then you have a Slide o\x1e the brake rotor / drum. failure that requires the purchase of new control modules and the cost and Replace the brake shoes and return springs as necessary. complication of having to reprogram them. Now you have to resell the job as Reinstall or replace the brake rotor / drum; install and tighten the retaining well as explain why and how these electronic components failed when youscrews. were performing normal service. Not fun.21 8'