1.34" Bore Master Cylinder Upgrade
Upgrade your braking system with a larger 1.34" bore master cylinder, designed for 1988–2000 GM 1500 OBS trucks equipped with vacuum power brakes. This upgrade helps compensate for increased fluid volume demands caused by rear disc brake conversions and larger front brake calipers, helping improve pedal feel when using upgraded brake components.
Kit Includes:
- 1.34" bore master cylinder
- Adapter fitting for connecting to factory truck brake lines
- Universal Bench bleeding kit
Installation & Fitment Notes:
- Designed for use with a vacuum brake booster only. Not compatible with hydroboost systems.
- Factory hard brake lines may require bending or repositioning to line up with the new master cylinder ports.
- The factory low brake fluid level sensor on the new master is not used on 1988–2000 OBS trucks with this setup.
