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Dorman - First Stop Brake Master Cylinder P/N:M630826
$174.99
Convert brake-pedal effort into hydraulic pressure for both brake circuits with the Dorman - First Stop Brake Master Cylinder (M630826). It installs as a direct-fit replacement for the 2005-2007 Chevrolet Silverado 1500, 2007 Silverado 1500 Classic, 2005-2006 Silverado 1500 HD, 2005-2007 GMC Sierra 1500, 2007 Sierra 1500 Classic, 2005-2006 Sierra 1500 HD, and 2007 Sierra 1500 HD Classic [All engines]. This is a 100% new unit — built entirely from new materials rather than remanufactured — and is engineered to match the design, function, and performance of the original master cylinder on the listed applications.
- Aluminum build: a 1.125 in bore with two outlets, and a housing made to match the casting material of the original part.
- Fluid-resistant seals: all rubber components use a high-quality EPDM compound for resistance to glycol-based brake fluid.
- Included components: ships with the reservoir and sensor; the rearward outlet is 1/2-20 and the secondary outlet thread is 1/2-20. Mounting hardware is not included — consult the vehicle service information for the correct fasteners and whether they may be reused.
- Built to spec: made to meet rigorous SAE International standards.
Signs the original may need replacing include a low, soft, or sinking brake pedal or fluid seeping at the master cylinder; because these symptoms can have other causes, have the brake system diagnosed before replacing. Country of origin: China.
Interchange: 100-3915 · 1003915 · 10-4652 · 104652 · 130.66075 · 355-47201 · 35547201 · 1741169 · 19209325 · NM4345 · MC391539 · Manufacturer part number M630826
This part cross-references / interchanges with the following part numbers:
100-3915, 10-4652, 130.66075, 355-47201, 1741169, 19209325, NM4345, MC391539
Frequently Asked Questions
What does the M630826 master cylinder do?
It converts the force from your brake pedal into hydraulic pressure, sending brake fluid to the vehicle's brake circuits through its two outlets.
Which vehicles does it fit?
It's a direct-fit replacement for the 2005-2007 Chevrolet Silverado 1500 and GMC Sierra 1500, plus the 1500 Classic, 1500 HD, and Sierra 1500 HD Classic trims — see the Buyer's Guide tab for the full list.
Does it come with a reservoir and sensor?
Yes. Per the catalog, both the reservoir and the sensor are included. Mounting hardware is not included.
What is it made of?
The master cylinder is aluminum with a 1.125 in bore, and its housing is built to match the casting material of the original part. All rubber components use an EPDM compound resistant to glycol-based brake fluid.
What are signs my master cylinder may need replacing?
A low, soft, or sinking brake pedal, or fluid leaking at the master cylinder, can be signs. Have the brake system diagnosed, since these symptoms can have other causes.
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Dorman
Dorman - First Stop Brake Master Cylinder P/N:M630826
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