Convert brake-pedal force into hydraulic pressure across both brake circuits with the Dorman - First Stop Brake Master Cylinder M630481. It drops in as a direct-fit replacement for the 2006-2008 Chevrolet HHR [All], and it is built 100% new — not remanufactured — from high-quality materials for a dependable service part.
- Aluminum construction: the cylinder housing is built to match the casting material of the original part for similar performance, with a 0.938-inch bore.
- Fluid-resistant seals: all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
- Two outlets: rearward outlet size M10 x 1.0, secondary outlet thread M12 x 1.0, and a primary outlet thread pitch of 1 mm.
- Included: reservoir and sensor are included; mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused.
Made to meet rigorous SAE International standards. Country of origin: China.
Interchange: 174-1153 · 1741153 · 174-1167 · 1741167 · 100-2357 · 1002357 · 13-3281M · 133281M · 10-3281 · 103281 · 130.62145 · 13062145 · 355-47099 · 35547099 · 15939480 · 15939484 · 22725391 · NM4110 · MC391328 · F144412 · MC144412 · MWMMC900051. Manufacturer part number M630481.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does a brake master cylinder do?
It converts the force of your brake-pedal push into hydraulic pressure, sending brake fluid through the outlets to the vehicle's brake circuits.
What vehicle does the M630481 fit?
It is a direct-fit replacement for the 2006-2008 Chevrolet HHR [All]. Check the Buyer's Guide tab to confirm the fit for your vehicle.
Does it include a reservoir and sensor?
Yes. Per the catalog, both a reservoir and a sensor are included. Mounting hardware is not included.
What are signs this master cylinder may need replacing?
A sinking or spongy pedal or unexplained fluid loss can signal a failing master cylinder. Diagnose the cause first, since these signs can have other sources.
What is it made of?
The cylinder housing is aluminum, built to match the casting material of the original, and the rubber components use an EPDM compound resistant to glycol-based brake fluid.