Dorman M630377 brake master cylinder for the 2003-2005 Chevrolet Astro and other vehicles turns pedal force into hydraulic pressure for the brakes.
- Dorman First Stop line
- Aluminum housing with a 1.25 inch bore
- All rubber components are EPDM compound, which resists glycol-based brake fluid
- Made entirely of new materials
- Made to meet SAE International standards
Quick facts
- Part: Dorman M630377 brake master cylinder
- Fits: 2003-2005 Chevrolet Astro and other vehicles
- Material: Aluminum
- Condition: New
A soft or sinking brake pedal, a falling fluid level in the reservoir or a brake warning light can mean a master cylinder is wearing out inside. These signs alone do not prove this part is the problem, since a leak elsewhere in the brake system can give the same pedal feel.
Fits
This master cylinder is a direct-fit replacement for the 2003-2005 Chevrolet Astro and the 2003-2005 GMC Safari. Either vehicle needs just one.
Specifications
Fit and size
- Bore diameter: 1.25 in
- Number of outlets: 2
- Rearward outlet size: 1/2-20 in
- Secondary outlet thread diameter: 1/2-20 in
- Quantity per vehicle: 1
Build and materials
- Material: Aluminum
- Rubber components: EPDM compound
- Reservoir: included
- Condition: New
- Country of origin: China
In the box
One brake master cylinder with its reservoir. Mounting hardware and a sensor are not included, so plan on new fasteners, since the old ones may not be reusable.
Interchange: 174-1006 · 100-2978 · 13-3101 · 10-3101 · 130.66050 · 131.66050 · 355-47177
18048897 · M4082 · NM4082 · MC390830 · F142298 · MC142298
This part cross-references / interchanges with the following part numbers:
174-1006, 100-2978, 13-3101, 10-3101, 130.66050, 131.66050, 355-47177, 18048897, M4082, NM4082, MC390830, F142298, MC142298
Frequently Asked Questions
Is Dorman M630377 a Chevy Astro master cylinder for model years 2003-2005?
Yes. Dorman M630377 fits the 2003-2005 Chevrolet Astro and the 2003-2005 GMC Safari.
Does the Dorman M630377 come with the reservoir?
Yes. The master cylinder comes with its reservoir. Mounting hardware and a sensor are not included.
What brake fluid are the rubber parts in this master cylinder made to resist?
All rubber components are made of EPDM compound, which resists glycol-based brake fluid.
What is the bore size of the Dorman M630377 master cylinder?
Dorman M630377 has a 1.25 inch bore and an aluminum housing. Its two outlets are both 1/2-20.
Is the Dorman M630377 built to SAE standards?
Yes. Dorman M630377 is made to meet SAE International standards and is built entirely from new materials.
