AB Tools Trailer Axle Brake Expander - 4 Pack
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Product Information
Full details
This guide is for owners of Alko auto-reverse trailer and caravan brake systems. The key benefit is ensuring reliable brake shoe activation for safe towing. A potential consideration is their specific compatibility with Alko systems. These brake expanders are crucial components that push the brake shoes apart within the drum, enabling the braking mechanism to function. This 4-pack provides replacements for multiple axles or spares, suitable for both 200 x 50mm and 230 x 60mm brake shoe sizes.
All features
| Model Part Number | BS175_4pk |
|---|---|
| Brand | AB Tools |
Extended Product Information
FAQs
What is an Alko style brake expander?
An Alko style brake expander is a mechanical component located within the brake drum of compatible trailer and caravan braking systems. Its function is to push the brake shoes outwards against the drum when the brakes are applied or when reversing with an auto-reverse system.
Are these expanders suitable for any trailer brake system?
No, these specific expanders are designed for Alko auto-reverse trailer and caravan brake systems only. Compatibility with other brands or types of brake systems is not guaranteed.
How do I know if my trailer has 200 x 50mm or 230 x 60mm brake shoes?
You can determine your brake shoe size by removing the brake drum and measuring the dimensions of the brake shoes themselves. Alternatively, consult your trailer's manual or the manufacturer's specifications.
How often should I check my brake expanders?
It is recommended to inspect your brake expanders as part of your regular trailer brake maintenance. This is typically done annually or before long journeys, especially when the brake drums are removed for inspection or service.
Can I use a lubricant on the brake expander?
It is generally not recommended to lubricate the brake expander mechanism itself, as this can attract dust and debris, hindering its operation. Focus on cleaning and ensuring free movement. Any lubrication should be applied sparingly to specific contact points like shoe slides or adjuster threads, avoiding friction surfaces.
What does 'auto-reverse' mean in relation to these expanders?
Auto-reverse systems on trailers automatically disengage the trailer brakes when the towing vehicle starts to reverse. The brake expanders are a key component that allows this system to function by ensuring the brake shoes retract correctly when reversing.
Do I need to replace all expanders if one fails?
While you can replace a single faulty expander, it is often good practice to replace expanders in pairs on the same axle to ensure consistent braking performance. If the existing expanders are old and showing signs of wear, replacing all on an axle or even all on the trailer may be advisable for long-term reliability.
Troubleshooting
Brake expander feels stiff or seized
Inspect for rust or dirt build-up. If severely corroded, replacement is necessary. Ensure adjustment mechanism is clean and free of debris.
Uneven braking or failure to auto-reverse
Check if all brake expanders are functioning correctly and are properly adjusted. Ensure brake shoes are seated correctly and not binding. May require replacement of one or more expanders.
Rattling noise from brake drum
This could indicate a loose brake expander or improperly adjusted brake shoes. Remove drum and inspect for loose components. Re-adjust brake shoes and expander.
Brake shoes not retracting fully
The expander may not be releasing properly, or the brake shoe return springs may be weak. Inspect the expander for sticking and the return springs for damage or loss of tension. Ensure correct expander alignment.
Pros and Cons
Pros
- Designed for reliable Alko auto-reverse systems.
- Durable steel construction for longevity.
- Corrosion-resistant zinc plating.
- Accommodates common Alko brake shoe sizes.
- Convenient 4-pack for multiple applications or spares.
Cons
- Only compatible with Alko auto-reverse systems.
- Requires mechanical knowledge for installation and adjustment.
- Sold as a set of 4, may be excessive for single-axle trailers if spares are not desired.
Setup, Compatibility & Care
Compatibility:
- These brake expanders are designed exclusively for Alko auto-reverse trailer and caravan brake systems.
- They are compatible with both 200 x 50mm and 230 x 60mm brake shoe sizes within these Alko systems.
Setup:
Installation involves disassembling the brake drum to access the brake shoes and expander unit. The old expander is removed, and the new one is fitted into its place, ensuring correct orientation. Proper adjustment of the brake shoes and expander mechanism is critical after installation. This typically involves setting the correct tension using the adjustment mechanism integrated into the brake assembly, often accessed through a small hole in the brake backing plate.
Care:
- Regular Inspection: Periodically inspect the brake system, including the expanders, for signs of rust, damage, or excessive wear. This is best done when the brake drums are removed for other maintenance.
- Cleaning: If the brake drums are removed, clean the brake expanders and surrounding components with a dry brush or compressed air to remove dust and debris. Avoid using water or lubricants on the expander mechanism itself, as this can attract dirt and impede function.
- Lubrication (External): While the expander itself should remain clean and dry, the brake shoe contact points and adjuster threads may benefit from a light application of brake lubricant, applied carefully to avoid contamination of the friction surfaces. Always follow the trailer manufacturer's recommendations for lubrication.
- Protection: Ensure brake drums are properly sealed to prevent excessive water and dirt ingress, which can accelerate corrosion of internal components like the brake expanders.