AL-KO 316 Stainless Hydraulic Steel Piston

Name: Stainless Steel Caliper Piston Fits AL-KO | 316 Grade
Brand: AL-KO
SKU: CALP-PART-PISTON
Price: 47.50 AUD
Availability: InStock

SKU: CALP-PART-PISTON Category: Disc Caliper and Parts Tag: marine parts Brand: AL-KO

Al-Ko 316 Stainless Hydraulic Steel Piston

Price

$47.50 Inc.GST

Key Benefits of Stainless Hydraulic Caliper Piston

✓ Suits: AL‑KO calipers
✓ Manufactured from Marine-Grade 316 Stainless Steel.
✓ Long-Lasting Product with Easy Installation.

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AL-KO 316 Stainless Steel Hydraulic Caliper Piston

AL-KO replacement stainless hydraulic caliper piston that suits both AL-KO and Trojan hydraulic calipers.

These stainless caliper pistons are manufactured for improved performance. Consider stainless pistons in your stainless hydraulic caliper.

Note: The image shows the top and bottom of the piston. Price per each or one piece.

Installation

We recommend using a silicon-based lubricant such as “inox MX6 synthetic grease.

Are Stainless Steel Pistons Worth it?

Phenolic caliper pistons are a common alternative to stainless steel. While they offer some resistance, they are incredibly susceptible to swelling, wear, and tear over time.

The movement of phenolic pistons creates slight abrasive marks, contributing to their gradual swelling and eventual adhesion, leading to failure.

In contrast, 316 Stainless Steel, renowned for its marine-grade quality and resistance to moisture absorption, provides a rust-free, low-maintenance solution when used in hydraulic pistons. The sliding mechanism of stainless pistons significantly prolongs their lifespan compared to standard counterparts.

For boat trailers using phenolic brake pistons, Couplemate™ engineers consistently recommend investing in Stainless Steel brake pistons for optimal performance and durability.

Product Specifications

The AL-KO Hydraulic Piston is sold individually.

Materials: 316-Grade Stainless Steel
Suits Calipers: AL‑KO

You can also buy replacement caliper brake pads here.

How to Install Replacement Caliper Pistons?

During installation, generously apply hydraulic oil on and around the seal within the piston. When acquiring new hydraulic calipers, owners have the option to purchase stainless pistons as an additional feature.

Seal wear might allow saltwater ingress into the piston, so it’s advisable to have a replacement seal kit on hand in case the old seals become stretched during caliper cleaning.

Pro Tip: After installing a stainless brake piston in Trojan calipers, flush all hydraulic lines to remove any contaminated fluid.

Finally, a good article about Refurbishing Brake Caliper Pistons on your Boat Trailer

The following parts are complementary to these caliper seals.

Frequently Asked Questions

What are the exact dimensions of this piston? It features a precise 54mm diameter and a 47mm length, acting as a direct drop-in replacement for part number 341083SS.
Will this fit caliper brands other than AL-KO? Yes, this marine-grade piston is fully compatible with AL-KO, Trojan (AU and MK7 models), Meher HBCFG, as well as Loadforce TA300 and TA400 hydraulic calipers.
Do I need to replace the seals when installing this piston? It is highly recommended to replace the main seal and rubber boot (Seal Kit P/N: 341082) concurrently to guarantee a watertight seal and optimal hydraulic pressure.
Why is 316 stainless steel preferred for boat trailers? Grade 316 contains molybdenum, an alloy component that specifically prevents severe pitting, crevice corrosion, and rust caused by saltwater exposure.

Advantages of the AL-KO 316 Stainless Steel Piston

Ultimate Corrosion Resistance: Forged from premium 316 marine-grade stainless steel to ensure lifetime protection against saltwater rust.
Prevents Caliper Binding: Replaces older phenolic plastic pistons, which are infamous for absorbing moisture/brake fluid, swelling up, and seizing inside the caliper.
Economical Repair Solution: Avoid the high cost of a complete caliper replacement by quickly refurbishing your existing hydraulic system using factory-spec components.
High-Pressure Reliability: Engineered to handle standard operational brake loads up to 1000 PSI (6.9 MPa) with smooth mechanical travel.

Disadvantages of Using Non-Genuine Parts

Inferior Material Quality: Many generic alternatives use lower-grade stainless steel (such as 304) or chrome-plated steel, which rapidly corrode and pit in saltwater.
Inaccurate Dimensional Tolerances: Tiny manufacturing variances in non-genuine pistons can easily ruin internal seals, causing fluid leaks or catastrophic brake failure.
Premature Component Wear: Poorly finished aftermarket surfaces create unnecessary friction, which quickly tears through expensive rubber boot seals and O-rings.
Compromised Safety & Voided Warranties: Installing non-genuine brake components risks trailer safety compliance on public roads and instantly voids your official AL-KO manufacturer warranty protections.

Additional information

Weight	0.5 kg
Dimensions	6 × 6 × 6 cm
Materials	Stainless Steel

Our Service Lifetime Warranty

Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.

Couplemate™ is a manufacturer and vendor of high-quality towing, trailer, and caravan components. Couplemate™ Core Goods and Custom Work are guaranteed to be free of defects for the service lifetime of the product when used as intended.

Warranties are non-transferrable and Couplemate™ requires satisfactory proof of purchase prior to issuing a remedy. The full Couplemate™ Warranty Policy can be found in the Terms & Conditions: Section 8 – Consumer Guarantees & Warranty.

Warranties are in addition to your rights under the Australian Consumer Law. If something is wrong with your order, please contact our team.

60-Day Returns

After 60 years of experience, we know that life has its unpredictable moments.

All Couplemate™ orders (online, over the phone, or in-store) have a 60 day period for change-of-mind returns and exchanges. There are some items that can’t be returned and some returns may incur a 15% restocking fee.

You can view our full policy for change-of-mind returns here.

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