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B&Q£30.02Visit shop B&Q - 4 Pack Alko Trailer Axle Auto Reverse Replacement Brake Expander Indespension
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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.
| Model Part Number | BS175_4pk |
|---|---|
| Brand | AB Tools |
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.
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.
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.
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.
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.
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.
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.
Inspect for rust or dirt build-up. If severely corroded, replacement is necessary. Ensure adjustment mechanism is clean and free of debris.
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.
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.
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.
Compatibility:
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:
