The Tech 3 Master Cyl Lid Diaphragm is a replacement seal for Hope's Tech 3 hydraulic disc brakes. If your brakes are feeling spongy, losing power, or leaking fluid around the master cylinder, this diaphragm is likely your culprit. It's a wear item that can degrade over time, especially if your bike sees regular use or lives somewhere damp.
The Tech 3 Master Cyl Lid Diaphragm is a replacement seal for Hope's Tech 3 hydraulic disc brakes. If your brakes are feeling spongy, losing power, or leaking fluid around the master cylinder, this diaphragm is likely your culprit. It's a wear item that can degrade over time, especially if your bike sees regular use or lives somewhere damp.
This is a genuine Hope spare part, so you know it'll fit properly and work as intended. If you're comfortable doing basic brake maintenance, it's a straightforward swap. Otherwise, bring your bike to the workshop and we'll sort it for you. Essential if you
Free same-day Click & Collect. Order online and collect from our London workshop, usually ready within a couple of hours. We will email you the moment it is ready.
Home delivery. Dispatched the same working day on orders placed before 3pm. Standard UK delivery is tracked and typically arrives in 2 to 3 working days.
Fitting while you wait. Buying a part you would rather not fit yourself? Our mechanics can fit most parts on the spot. Just ask when you collect.
30-day returns. Changed your mind? Return any unused item in its original packaging within 30 days for a full refund.
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Pop in, call us, or book the bike in. Our mechanics will sort it while you wait.