Your Cart
Items
Free Shipping on orders over $500.00
Part # AF51705
PARKING BRAKE ASSEMBLY
Get everything you need
ABI-199-62
WHEEL AND BRAKE KIT, 3-BOLT 1.5" AXLE
$4,840.00 / was $6,050.00
Product Details
Specifications
- Approval
- FAA PMA
- Condition
- New
- Manufacturer
- Airframes Alaska
- Dimensions
- L: 8.5 x W: 6.5 x H: 4 in
- Weight
- 1 lbs
- Unit of Measure
- Each
- McFarlane Part Number
- AF51705
Product Description
Parking Brake for Piper Aircraft
FAA-PMA Replacement for Scott 4500A-1 Parking Brake Valve Assembly
The AF51705 parking brake is an FAA-PMA approved direct replacement for the Scott 4500A-1 parking brake, which is no longer in production. Designed for a wide range of Piper PA-18, PA-19, PA-20, PA-22 aircraft, this brake provides a dependable replacement solution for aging or worn parking brake systems.
Built with a hard anodized finish, the AF51705 offers superior corrosion protection and durability, especially compared to bare aluminum parking brake assemblies that lack surface protection. The precision-machined valve design ensures reliable brake hold, helping prevent unintended aircraft movement during parking, engine start-up, or ground operations, particularly important for aircraft operating on uneven terrain or in windy conditions.
Installed between the master cylinder and brake caliper, the system is simple to install and operate. To activate, depress the brakes, engage the distinctive gold lever, and release, locking the brakes securely in place. Depressing the brake pedals again automatically disengages the parking brake, helping prevent inadvertent activation before landing or takeoff.
Conveniently mounted beneath the front seat, the lever is easily accessible to the pilot. The design also allows installation of a linkage rod, enabling rear occupants to engage the parking brake if desired.
Key Features:
- FAA-PMA replacement for Scott 4500A-1 parking brake
- Hard anodized finish for corrosion resistance and extended service life
- More durable and protected than bare aluminum alternatives
- Simple gold-lever activation for secure brake engagement
- Prevents unintended aircraft movement during parking or ground operations
- Installs between master cylinder and brake caliper
- Accessible under front seat for pilot operation
- Optional rod connection allows rear passenger activation
- Two required per aircraft
Overhauling your brake system? Other upgrades for PA-18, PA-19, PA-20, and PA-22 brakes:
- Brake discs: APS164-01900 and APS164-06700 (selection is dependent on your wheel and brake assembly)
- Brake linings: APS66-10600 (individual), or rivet kits APS66-10600-4K and APS66-10600-8K
- Brake and wheel assemblies: ABI-199-xxx
- Brake master cylinders: AF51695K
WARNING: Cancer and/or Reproductive Harm - California Proposition 65 Resources
Eligible Aircraft
| Make | Model | Start S/N | End S/N | Eligibility Chart |
|---|---|---|---|---|
| Piper PA-18 | PA-18 | S/N 18-1 – 18-7632 | 18-7632 | Eligibility Chart 7842 |
| Piper PA-18-105 (Special) | PA-18-105 (Special) | S/N 18-1 – 18-7632 | 18-7632 | Eligibility Chart 7842 |
| Piper PA-18-125 (Army L-21A) | PA-18-125 (Army L-21A) | S/N 18-1 – 18-7632 | 18-7632 | Eligibility Chart 7842 |
| Piper PA-18-135 (Army L-21B) | PA-18-135 (Army L-21B) | S/N 18-1 – 18-7632 | 18-7632 | Eligibility Chart 7842 |
| Piper PA-18-150 | PA-18-150 | S/N 1809001 – 1809113 | 1809113 | Eligibility Chart 7842 |
| Piper PA-18-150 | PA-18-150 | S/N 18-3771 – 18-8309025 | 18-8309025 | Eligibility Chart 7842 |
| Piper PA-18A | PA-18A | S/N 18-1 – 18-7632 | 18-7632 | Eligibility Chart 7842 |
| Piper PA-18A-135 | PA-18A-135 | S/N 18-1 – 18-7632 | 18-7632 | Eligibility Chart 7842 |
| Piper PA-18A-150 | PA-18A-150 | S/N 18-3771 – 18-8309025 | 18-8309025 | Eligibility Chart 7842 |
| Piper PA-18AS-125 | PA-18AS-125 | S/N 18-1 – 18-7632 | 18-7632 | Eligibility Chart 7842 |
| Piper PA-18AS-135 | PA-18AS-135 | S/N 18-1 – 18-7632 | 18-7632 | Eligibility Chart 7842 |
| Piper PA-18AS-150 | PA-18AS-150 | S/N 18-3771 – 18-8309025 | 18-8309025 | Eligibility Chart 7842 |
| Piper PA-18S-105 (Special) | PA-18S-105 (Special) | S/N 18-1 – 18-7632 | 18-7632 | Eligibility Chart 7842 |
| Piper PA-18S-125 | PA-18S-125 | S/N 18-1 – 18-7632 | 18-7632 | Eligibility Chart 7842 |
| Piper PA-18S-135 | PA-18S-135 | S/N 18-1 – 18-7632 | 18-7632 | Eligibility Chart 7842 |
| Piper PA-18S-150 | PA-18S-150 | S/N 18-3771 – 18-8309025 | 18-8309025 | Eligibility Chart 7842 |
| Piper PA-19 (Army L-18C) | PA-19 (Army L-18C) | S/N 19-1 – 19-3 | 19-3 | Eligibility Chart 7842 |
| Piper PA-19S | PA-19S | S/N 19-1 – 19-3 | 19-3 | Eligibility Chart 7842 |
| Piper PA-20 | PA-20 | S/N 20-1 – 20-99999 | 20-99999 | Eligibility Chart 7842 |
| Piper PA-20-115 | PA-20-115 | S/N 20-1 – 20-99999 | 20-99999 | Eligibility Chart 7842 |
| Piper PA-20-135 | PA-20-135 | S/N 20-877 – 20-99999 | 20-99999 | Eligibility Chart 7842 |
| Piper PA-20S | PA-20S | S/N 20-1 – 20-99999 | 20-99999 | Eligibility Chart 7842 |
| Piper PA-20S-115 | PA-20S-115 | S/N 20-1 – 20-99999 | 20-99999 | Eligibility Chart 7842 |
| Piper PA-20S-135 | PA-20S-135 | S/N 20-877 – 20-99999 | 20-99999 | Eligibility Chart 7842 |
| Piper PA-22 | PA-22 | S/N 22-1 – 22-99999 | 22-99999 | Eligibility Chart 7842 |
| Piper PA-22-108 | PA-22-108 | S/N 22-8000 – 22-99999 | 22-99999 | Eligibility Chart 7842 |
| Piper PA-22-135 | PA-22-135 | S/N 22-534 – 22-99999 | 22-99999 | Eligibility Chart 7842 |
| Piper PA-22-150 | PA-22-150 | S/N 22-2378 – 22-99999 | 22-99999 | Eligibility Chart 7842 |
| Piper PA-22-160 | PA-22-160 | S/N 22-2378 – 22-99999 | 22-99999 | Eligibility Chart 7842 |
| Piper PA-22S-135 | PA-22S-135 | S/N 22-534 – 22-99999 | 22-99999 | Eligibility Chart 7842 |
| Piper PA-22S-150 | PA-22S-150 | S/N 22-2378 – 22-99999 | 22-99999 | Eligibility Chart 7842 |
| Piper PA-22S-160 | PA-22S-160 | S/N 22-2378 – 22-99999 | 22-99999 | Eligibility Chart 7842 |
Cross Reference
Reference only: Please verify the product is eligible for your aircraft before adding to your cart.
-
4500A-1
-
492-023
-
U4500A-1
FAQs
What is part number AF51705?
AF51705 is the Airframes Alaska Parking Brake assembly. It is a PMA-approved (Parts Manufacturer Approval) direct replacement for the Scott 4500A-1 parking brake, engineered to secure the aircraft on the ground and prevent unintended movement, particularly in windy conditions or on rough terrain.
Which aircraft is it eligible for?
It is eligible for the Piper PA-18 (Super Cub) series, PA-19, and PA-20 through PA-22 models, including the various PA-18/PA-19 sub-variants covered under the FAA PMA approval.
Is it FAA-approved?
Yes. AF51705 holds FAA Parts Manufacturer Approval (PMA No. PQ3848CE) under 14 CFR § 21.303, approved as a replacement for the Scott article 492-023 based on test and computation data (Drawing No. AF51705).
What part does it replace?
It is a direct replacement for the original Scott 4500A-1 parking brake. Installation and functionality match the original unit, so no modification of the aircraft is required.
How many do I need per aircraft?
Two brakes are required per aircraft — one for each pedal. A single brake is available for individual replacement, or a full set can be purchased to replace both.
How does the parking brake work?
To set the brake, depress the brake pedals firmly, engage the gold lever, and release. This holds pressure in the line to keep the aircraft secured. The brake connects from the master cylinder to the caliper.
Where is it located in the aircraft?
The parking brake is mounted beneath the front seat, positioned for easy access by the pilot during ground operations.
How difficult is installation?
Installation is straightforward: the unit connects from the master cylinder to the caliper. As a direct replacement, it requires no airframe modifications.
What makes it more durable than other options?
AF51705 features a hard anodized finish that provides superior corrosion resistance and increased durability compared with bare, unprotected metal alternatives — an advantage in harsh weather and backcountry environments.
Can rear-seat passengers use the brake?
Yes. The design allows a metal rod to be connected to the lever, enabling rear passengers to apply the brake when needed.
