Description
Overview:
The 1/4 inch UNF x 28 tpi Brake Bleed Screw (MPN 305 226) is a small but vital service part for hydraulic braking systems on road vehicles, trailers, and plant machinery. It is a plated steel screw with a hose nipple that allows controlled release of air and old fluid during brake bleeding. The thread is 1/4 inch (6.35 mm) Unified Fine with 28 threads per inch, which equates to an approximate pitch of 0.91 mm. Designed to fit bleed ports on brake calipers and wheel cylinders using this thread, it helps restore a firm pedal or lever by removing trapped air that reduces braking efficiency. Supplied individually (each), it is suitable for workshop professionals and DIY users alike.
Key Features:
- 1/4 inch UNF x 28 tpi thread for common bleed ports (diameter 6.35 mm, pitch approx. 0.91 mm)
- Plated steel construction for durability and corrosion resistance
- Precision-machined threads and seating surfaces for a reliable seal when tightened
- Hose nipple allows clean, controlled bleeding with a clear tube
- Fits calipers or wheel cylinders designed for 1/4-28 UNF bleed screws
- Compact form makes access easier in tight wheel arches and hubs
- Helps remove air from hydraulic circuits for consistent, safe braking performance
- Suitable for use in garages, workshops, and mobile service vans
- Supplied as a single screw (each) for straightforward replacements
- Sensible to confirm thread specification before ordering or installation
Typical Applications:
Used during brake servicing and repairs to purge air after replacing pads, shoes, cylinders, calipers, hoses, or fluid. Common on cars, light commercial vehicles, trailers, and machinery with hydraulic brakes such as compact tractors, telehandlers, and forklifts. Suitable for routine bleeding to maintain braking efficiency and for fault diagnosis where a spongy pedal indicates air in the system.
Also known as:
Bleeder screw, bleed nipple, brake bleeder valve, bleed valve, purge screw, air bleed screw, brake nipple, hydraulic bleeder, bleed fitting, caliper bleeder.
Product Specifications
L&S Part No. | 305 226 |
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Unit of Sale | 1 Piece |