# 12-22001 - REBUILT KIT, MASTER CYLINDER BRAKE LEVER, 1/2" - HAYES (AURORA)

12-22001 - REBUILT KIT, MASTER CYLINDER BRAKE LEVER, 1/2" - HAYES (AURORA)  
  
Aftermarket master cylinder Hayes brake lever rebuild kit for 1/2"" piston.  
  
1/2" Piston version.  
  
Rebuilds the piston seals and components of the left brake lever internals without having to replace the whole master cylinder on 2019 and newer Aurora models.   
  
**_Will not work on the 2020+ Frontier model_s (It uses 12-22027)**  
  
  
Rebuilds Argo/Hayes hand brake lever:  
  
10577C - 2019+ Aurora Models  
  
  
Compatible with DOT 4 fluid or DOT 4 Racing fluid.

## Details

- **Price:** 22.95 USD
- **Vendor:** DOC'S FULL BORE OUTDOOR

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 22.95 USD | In stock |

## Images

- 12-22001 - REBUILT KIT, MASTER CYLINDER BRAKE LEVER, 1/2" - HAYES (AURORA)
- Doc's Full Bore Outdoor Parts & Accessories

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> Source: [Doc's Full Bore Outdoor](https://parts.docsfullboreoutdoor.com/products/12-22001)
> Updated: 2026-09-02