Boxster Parking Brake Adjustment Guide

Mastering Your Boxster's Parking Brake: A Comprehensive Adjustment Guide

Over time, the efficacy of your Porsche Boxster's parking brake can diminish, leaving you with a vehicle that doesn't hold as securely as it should. This can be a particular concern on inclines, impacting both safety and peace of mind. Fortunately, the process of adjusting the parking brake shoes is a relatively straightforward task that most home mechanics can accomplish within an hour, without the need for overly specialised tools. By following this detailed guide, you'll be able to restore your Boxster's parking brake to its optimal performance, ensuring a reliable hold every time.

Why Adjust Your Parking Brake?

The parking brake, often referred to as the handbrake, works independently of your main hydraulic braking system. It typically engages a separate set of smaller brake shoes located within the rear brake drum or caliper assembly. Over numerous applications and due to general wear and tear on the brake pads and discs, these shoes can become slightly misaligned or lose their tension. This leads to a parking brake that requires more 'pull' to engage, or worse, fails to hold the vehicle effectively. Adjusting it ensures that the shoes make proper contact with the drum or disc surface, providing a secure hold.

Assessing the Need for Adjustment

Several signs indicate that your Boxster's parking brake might need adjustment:

• Excessive Lever Travel: The parking brake lever pulls up much higher than it used to before engaging firmly.
• Poor Holding Power: The car still creeps or rolls slightly, even with the parking brake fully engaged, especially on a moderate incline.
• Uneven Engagement: One rear wheel seems to hold more effectively than the other.
• Parking Brake Warning Light Issues: The dashboard warning light may not illuminate immediately when the lever is pulled up.

Tools and Parts You'll Need

Before you begin, gather the following:

Talent: A willingness to get your hands dirty and a bit of patience!

Tools:

• Long, flat-head screwdriver (preferably magnetic)
• 13mm wrench (or socket and ratchet)
• Torx bit (size may vary, typically T25 or T30)
• Flashlight
• Wheel chocks
• Jack and jack stands
• Torque wrench (for wheel reinstallation)

Parts Required: While not strictly necessary for the adjustment itself, this is an excellent time to consider replacing worn brake pads or discs if they are due. A performance gain will be noticeable with properly adjusted and serviced brakes.

Step-by-Step Adjustment Procedure

Step 1: Preparation and Initial Access

Begin by ensuring the car is parked on a level surface. Engage the regular foot brake and place wheel chocks securely behind the front wheels. Release the parking brake lever completely and ensure the car is in neutral. Using your jack, safely raise the rear of the vehicle and support it securely on jack stands. Remove both rear road wheels to grant you access to the rear brake calipers and discs.

Step 2: Retracting Brake Pads (If Necessary)

With the wheels off, you'll be able to see the rear brake calipers. Insert your long screwdriver through the caliper opening and gently push the brake pads back into their resting position. The goal here is to retract the pads just enough so that the brake disc can spin freely on its hub. As you push the pads back, monitor the brake fluid level in the master cylinder reservoir under the bonnet. Pushing the caliper pistons back will raise the fluid level, and it could overflow if it's already near the maximum mark. If it's close, you may need to use a clean syringe to remove a small amount of fluid.

Step 3: Accessing the Adjustment Mechanism

Now, move to the interior of your Boxster. Locate the centre console and the parking brake lever. You'll need to access the adjustment mechanism located beneath the console. Carefully remove the rubber insert from the top of the centre console, often found just behind the handbrake lever. Underneath this rubber insert, you'll find a plastic panel secured by a Torx screw. Remove this screw. With the screw removed, gently pry up the plastic panel to reveal the handbrake's internal components. You will see a turnbuckle with two nuts. Loosen these two nuts slightly. This will create slack in the parking brake cables, which is crucial for accurate adjustment.

Step 4: Adjusting the Brake Shoes

This is the core of the adjustment. The parking brake shoes are adjusted via a small gear or sprocket. Unfortunately, this sprocket is only accessible through one of the lug nut holes in the brake disc itself. You’ll need your flashlight for this part. Rotate one of the rear brake discs until you can clearly see the adjusting sprocket through a lug nut hole. The sprocket typically has teeth and can be rotated upwards or downwards to tighten or loosen the brake shoes.

Using your screwdriver, carefully insert it into the lug nut hole and engage the adjusting sprocket. Rotate the sprocket. The objective is to tighten the brake shoes until they make slight contact with the inner surface of the brake disc, preventing it from rotating freely. You'll know you've reached the correct tension when you can no longer turn the disc by hand. It's important to note that if the sprocket assembly has been disturbed during previous brake work, you might need to experiment with turning it in both directions to find the tightening point. If you're turning the sprocket a lot and the disc isn't tightening, you are likely turning it the wrong way.

Important: Repeat this adjustment process for the opposite side of the vehicle. Ensure that both sides are adjusted to the point where the brake disc can just barely be rotated, indicating the shoes are making light contact.

Step 5: Fine-Tuning the Adjustment

Once you have both sides adjusted so the discs can no longer be rotated, you need to back them off slightly. Back off the adjusting sprocket nine full notches on each side. This ensures that the brake shoes are not dragging when the parking brake is released. After backing off nine notches, the brake disc should spin freely.

Step 6: Re-tensioning the Cables

Return to the interior of the car. With the adjustment made at the brake discs, you now need to set the tension on the cables via the turnbuckle nuts you loosened earlier. Pull the parking brake lever up several times to help the cables and shoes settle into their new positions. Then, pull the lever up until the ratchet clicks through two distinct notches. Now, using your 13mm wrench, tighten the two nuts on the turnbuckle until there is just a slight resistance felt when trying to rotate each of the rear wheels. It's a delicate balance – you want enough tension to engage the brake but not so much that the wheels are bound when the lever is down.

Step 7: Final Checks and Verification

Release the parking brake lever completely. Verify that both rear wheels now spin freely without any drag. Re-apply the parking brake lever. It should engage smoothly and hold the wheels firmly by the time it reaches approximately three to five notches from its fully released position. Confirm that the parking brake warning light on the dashboard illuminates as soon as the lever is pulled up past the initial few notches. There is a small switch located near the base of the handbrake lever that activates this light.

Finally, step on the foot brake pedal a few times. This helps to reset the main brake caliper pistons against the pads after you retracted them earlier. Recheck the brake fluid level in the master cylinder reservoir and top up if necessary with the correct type of brake fluid, ensuring it doesn't exceed the MAX mark.

Complementary Modifications

While adjusting the parking brake, it's an opportune moment to inspect the condition of your rear brake pads and discs. If they are worn, replacing them will not only ensure optimal parking brake function but also contribute to the overall safety and performance of your vehicle's primary braking system. A performance gain is often realised when all braking components are in good working order.

Frequently Asked Questions (FAQs)

Q1: How often should I check my parking brake adjustment?
It's good practice to check it annually or if you notice any of the symptoms mentioned earlier, such as increased lever travel.

Q2: Can I adjust the parking brake from the lever only?
While you can adjust the cable tension at the lever, the primary adjustment of the brake shoes themselves is done at the brake disc assembly as described.

Q3: What happens if I overtighten the parking brake?
Overtightening can cause the parking brake shoes to drag constantly, leading to premature wear, reduced fuel economy, and potentially overheating of the rear brakes.

Q4: Do I need to adjust both sides equally?
Yes, for consistent and effective braking, it's crucial to adjust both sides to the same tension.

Q5: My parking brake still doesn't feel right after adjustment. What else could be wrong?
If the adjustment doesn't resolve the issue, you may have worn brake shoes, damaged cables, or a faulty parking brake mechanism. In such cases, a professional inspection is recommended.

Conclusion

Properly adjusting your Boxster's parking brake is a vital maintenance task that enhances safety and ensures your vehicle remains reliably stationary when parked. By following these steps, you can confidently perform this adjustment yourself, saving time and money while enjoying the peace of mind that comes with a well-maintained braking system. Remember, a little maintenance goes a long way in preserving your Porsche's performance and your own safety on the road.

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