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Dorman - First Stop Brake Master Cylinder P/N:M21000
$98.99
Turn brake-pedal force into the hydraulic pressure that actuates the brakes with the Dorman - First Stop Brake Master Cylinder M21000. It drops in as a direct-fit replacement for a wide range of classic American cars, including the 1960 AMC Ambassador and Rebel, 1959-1960 Cadillac DeVille, 1955-1958 and 1960-1961 Chevrolet Bel Air, 1958-1961 Chevrolet Impala, 1959 Oldsmobile Dynamic 88, and 1958-1960 Pontiac Bonneville (engine: All) — see the Buyer's Guide tab for the full list of 32 applications.
- Cast iron housing: the cylinder housing is built to match the casting material of the original part for similar performance.
- Glycol-fluid-resistant seals: all rubber components use a high-quality EPDM compound to resist glycol-based brake fluid.
- 100% new: made entirely of new materials, not remanufactured.
- Built to spec: made to meet rigorous SAE International standards.
This unit has a 1-inch bore, two outlets with a rearward outlet size of (2) 7/16-24, and includes the reservoir; mounting hardware and a sensor are not included. If a failing master cylinder is the cause, signs it may need replacing include a brake pedal that slowly sinks under steady foot pressure, a soft or spongy pedal, or brake fluid leaking at the cylinder. Country of origin: Taiwan. Manufacturer part number M21000.
Frequently Asked Questions
What does the M21000 master cylinder do?
It converts the force from your brake pedal into hydraulic pressure that pushes brake fluid to the wheel brakes, actuating the braking system.
Does it come with a reservoir?
Yes, the reservoir is included. Mounting hardware and a sensor are not included; consult the vehicle service information for the correct fasteners and whether they may be reused.
What are the key specifications?
It has a cast iron housing, a 1-inch bore, and two outlets with a rearward outlet size of (2) 7/16-24.
What are signs my master cylinder may need replacing?
Possible signs include a pedal that slowly sinks under steady pressure, a soft or spongy pedal, or brake fluid leaking at the cylinder. Diagnose the cause before replacing.
Will this fit my vehicle?
It fits many 1955-1961 classic Chevrolet, Cadillac, Pontiac, Oldsmobile, and AMC models. Check the Buyer's Guide tab to confirm your exact year, make, and model.
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Dorman
Dorman - First Stop Brake Master Cylinder P/N:M21000
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