Brake Seal Kits

Brake Seal Kits: the small parts that keep a caliper holding pressure

Brake seal kits are the piston seals, dust seals and banjo bolt seals that let a caliper build and hold hydraulic pressure without weeping fluid. When a caliper drags, a piston sticks, or you spot fluid seeping past a bore or a banjo fitting, fresh seals are usually what brings it back. Fitting one is a rebuild job: strip the caliper, clean the bore, seat the new seals square, and bleed the system. Done right, it restores a firm lever or pedal and stops the slow fluid loss that ruins pads and rotors.

What ThreePiece stocks

This category currently shows 12 products from four brands: Bikers Choice, Performance Machine, Wilwood and Brembo. Prices run from $30 to $59, which is the current range for what is in stock right now rather than a fixed promise. The mix covers full caliper seal kits and individual sealing parts. Examples include the Bikers Choice 08-Up Brembo brake seal kit, the Bikers Choice 10mm banjo bolt seal 10-pack, the Performance Machine seal kit 112x6B and the Performance Machine seal kit 125x4. For individual piston seals, there are the Brembo 34mm inner pressure piston seal and the Brembo 38mm piston seal.

How to choose

The first decision is whether you need a complete seal kit or a single seal. A full kit like the Performance Machine sets matches a specific caliper model, so it carries every seal that caliper uses in one box. The Brembo items are individual piston seals sized 34mm and 38mm, which suits you when only one seal has failed and you can identify the bore size. Banjo bolt seals, sold in a 10-pack, are a separate wear item at the line fitting and are cheap enough to renew whenever a line comes off. Because seals are caliper-specific, matching the part to your exact caliper matters more than brand loyalty here.

What else you need with it

A seal job rarely stands alone. If a caliper is worn beyond seals, a full caliper rebuild kit or a replacement from brake calipers is the next step. While the system is open, it is a good time to inspect brake pads, brake rotors and brake lines, and to check the master cylinders that push fluid to the caliper. Small fasteners live in hardware, and if you are rethinking the whole setup, browse brake upgrade kits in the wider brakes section.

Fitment help and ordering

Fitment data in this category is limited: one product lists application detail, covering Harley-Davidson XL models across the 1979 to 1981 year range. Treat brand and part numbers as your guide and confirm the caliper before you buy. If you are unsure which seal your caliper takes, call fitment help at 813-535-5801 or reach us through contact us. All orders ship free, and Affirm and Katapult financing is available through our financing options.

Brake Seal Kits: the small parts that keep a caliper holding pressure

Brake seal kits are the piston seals, dust seals and banjo bolt seals that let a caliper build and hold hydraulic pressure without weeping fluid. When a caliper drags, a piston sticks, or you spot fluid seeping past a bore or a banjo fitting, fresh seals are usually what brings it back. Fitting one is a rebuild job: strip the caliper, clean the bore, seat the new seals square, and bleed the system. Done right, it restores a firm lever or pedal and stops the slow fluid loss that ruins pads and rotors.

What ThreePiece stocks

This category currently shows 12 products from four brands: Bikers Choice, Performance Machine, Wilwood and Brembo. Prices run from $30 to $59, which is the current range for what is in stock right now rather than a fixed promise. The mix covers full caliper seal kits and individual sealing parts. Examples include the Bikers Choice 08-Up Brembo brake seal kit, the Bikers Choice 10mm banjo bolt seal 10-pack, the Performance Machine seal kit 112x6B and the Performance Machine seal kit 125x4. For individual piston seals, there are the Brembo 34mm inner pressure piston seal and the Brembo 38mm piston seal.

How to choose

The first decision is whether you need a complete seal kit or a single seal. A full kit like the Performance Machine sets matches a specific caliper model, so it carries every seal that caliper uses in one box. The Brembo items are individual piston seals sized 34mm and 38mm, which suits you when only one seal has failed and you can identify the bore size. Banjo bolt seals, sold in a 10-pack, are a separate wear item at the line fitting and are cheap enough to renew whenever a line comes off. Because seals are caliper-specific, matching the part to your exact caliper matters more than brand loyalty here.

What else you need with it

A seal job rarely stands alone. If a caliper is worn beyond seals, a full caliper rebuild kit or a replacement from brake calipers is the next step. While the system is open, it is a good time to inspect brake pads, brake rotors and brake lines, and to check the master cylinders that push fluid to the caliper. Small fasteners live in hardware, and if you are rethinking the whole setup, browse brake upgrade kits in the wider brakes section.

Fitment help and ordering

Fitment data in this category is limited: one product lists application detail, covering Harley-Davidson XL models across the 1979 to 1981 year range. Treat brand and part numbers as your guide and confirm the caliper before you buy. If you are unsure which seal your caliper takes, call fitment help at 813-535-5801 or reach us through contact us. All orders ship free, and Affirm and Katapult financing is available through our financing options.