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Hydrastar® 7K Axles, 8 Lug Integral Tandem Axle Trailer Disc Brake Kit-Complete (1/2") {#C7K-T1} - Hydrastar

Hydrastar® 7K Axles, 8 Lug Integral Tandem Axle Trailer Disc Brake Kit-Complete (1/2") {#C7K-T1}

SKU #C7K-T1
by Hydrastar
Save 16% Save 16%
$2,500.00
$2,500.00 - $2,500.00
$2,500.00
$2,099.00
$2,099.00 - $2,099.00
$2,099.00

Complete tandem axle disc brake conversion kit for 7K axles with 8-lug hubs. Includes the Hydrastar EOH actuator, disc brake assemblies, brake lines, and all hardware needed for a full conversion.

7K
Axle Rating
TANDEM
Axle
DISC
Brakes
DOT
Compliant
What You Get

In The Box & Sold Separately

Included
✓
(2) E303-7K1-A — Hydrastar® 7K/8K Rated, Dacromet Coated Integral Single Axle Brake Kit (1/2 in. ) Corrosion-resistant Dacromet Coated Ro
✓
(2) 303-E78C — 7K/8K Axle Rated Dacromet Coated Integral
✓
(2) 303-7BI — 7K Axle Rated Dacromet Coated Bracket
✓
(1) 496-252 — Hydrastar® Hydraulic Tandem Axle Brake Line Kit – 25 ft., 3/16 in., 3000psi hydraulic brake pressure The Hydrastar® Brak
✓
(4) 14125A — Hydrastar® 7K/8K Rated Outer Bearing (5/8 in., 9/16 in.)
✓
(4) 472920 — Hydrastar® 6K/7K/8K Rated Grease Seal
✓
(4) MAT-20-275L — Press Posi Lube Grease Gap
Sold Separately
–
DOT 3 or DOT 4 Brake Fluid
–
Tools for installation
–
Hubs & Drums (use existing)
Questions about fitment?

Feel free to reach out to us or start a live chat in the bottom right corner for assistance.

Common Questions

Before You Buy

What PSI actuator is included?+
The 1,600 PSI GEN 8 actuator is included. This is the correct pressure for both disc and drum brake applications.
Do I need anything else to complete the install?+
You will need DOT 3 brake fluid (not included). Basic hand tools and a way to mount the actuator to your trailer tongue.
What is the difference between integral and slip over?+
Integral kits replace your entire hub and rotor as one piece. Slip over kits mount the rotor over your existing hub — faster install, no hub removal needed.
2024–2026 GM Silverado, Sierra & Denali Owners

Dashboard showing “Service Trailer Brakes”? Brakes disabled?

That’s a known GM software issue. Hydrastar has the fix — the GM Diode Module (#381-7074) is a plug-and-play inline solution.

Need Help Choosing?
Our team has helped thousands of trailer owners find the right setup.
Fastest response? Use the chat bubble in the bottom-right corner ↘
or call (812) 655-4544 · Mon–Fri, 8am–4:30pm ET