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Dorman - First Stop Brake Master Cylinder P/N:M66705
$147.99
The brake master cylinder is the hydraulic core of your braking system, converting pedal force into the fluid pressure that operates the brakes. This Dorman – First Stop Brake Master Cylinder (MPN M66705) is engineered to match the design and function of the original unit and drops in as a direct-fit replacement across a range of classic full-size GM cars, including the 1967-1970 Buick Electra, Riviera and Wildcat, 1970 Buick Estate Wagon, 1967 and 1969-1970 Buick LeSabre, 1967-1968 Cadillac Calais, DeVille and Fleetwood, 1967 Cadillac Eldorado, 1967 Oldsmobile 98, 1968 Oldsmobile Delta 88, 1967-1970 Pontiac Bonneville and Catalina, 1967 and 1969-1970 Pontiac Executive, and 1967-1968 Pontiac Grand Prix (all engines). See the Buyer's Guide tab for the full application list.
- 100% new: built entirely of new materials, not remanufactured.
- Cast-iron housing: constructed to match the casting material of the original part for similar performance.
- EPDM rubber components: made of a high-quality EPDM compound for resistance to glycol-based brake fluid.
- Strict specifications: made to meet rigorous SAE International standards.
Features a 1-inch bore, two outlets, and a 1/2-20 secondary outlet thread. Includes the reservoir; no sensor and no mounting hardware are included — consult the vehicle service information for the correct fasteners and whether they may be reused. Country of origin: China.
Interchange: Manufacturer part number M66705.
This part cross-references / interchanges with the following part numbers:
83-36018, 83-50018, M900093, 100-2228, M-82018, 11363, 13-1363, 10-1363, 130.62018, MC512040, 355-52005, 5458521, 5463417, 5464139, M1489, NM1489, MC36234, F66705, MC66705
Frequently Asked Questions
What does this brake master cylinder do?
It converts the force from your brake pedal into hydraulic pressure that operates the brakes. This 100% new unit is a direct-fit replacement for the listed applications.
Does it come with a reservoir?
Yes, the reservoir is included. A sensor is not included, and no mounting hardware is included.
What is it made of?
The cylinder housing is cast iron, constructed to match the casting material of the original part, and all rubber components use a high-quality EPDM compound that resists glycol-based brake fluid.
What are the specifications?
It has a 1-inch bore, two outlets, and a 1/2-20 secondary outlet thread, and is made to meet rigorous SAE International standards. Country of origin: China.
What are signs the master cylinder may need replacing?
A sinking or spongy pedal, gradual pedal fade under steady pressure, or brake fluid loss near the unit can be signs. Diagnose the cause first; if a failed master cylinder is at fault, this replaces it.
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Dorman - First Stop Brake Master Cylinder P/N:M66705
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